Merge branch 'master' of git://git.denx.de/u-boot-mips

2025-03-16 23:07:00 +00:00 · 2018-09-23 15:14:12 -04:00 · 2018-09-23 15:14:12 -04:00 · 284b27cf81
commit 284b27cf81
parent 9dc8d155d4 fdd1a9ff78
39 changed files with 1920 additions and 123 deletions
--- a/19
+++ b/19
@ -528,25 +528,6 @@ The following options need to be configured:
 		pointer. This is needed for the temporary stack before
 		relocation.

-		CONFIG_SYS_MIPS_CACHE_MODE
-
-		Cache operation mode for the MIPS CPU.
-		See also arch/mips/include/asm/mipsregs.h.
-		Possible values are:
-			CONF_CM_CACHABLE_NO_WA
-			CONF_CM_CACHABLE_WA
-			CONF_CM_UNCACHED
-			CONF_CM_CACHABLE_NONCOHERENT
-			CONF_CM_CACHABLE_CE
-			CONF_CM_CACHABLE_COW
-			CONF_CM_CACHABLE_CUW
-			CONF_CM_CACHABLE_ACCELERATED
-
-		CONFIG_SYS_XWAY_EBU_BOOTCFG
-
-		Special option for Lantiq XWAY SoCs for booting from NOR flash.
-		See also arch/mips/cpu/mips32/start.S.
-
 		CONFIG_XWAY_SWAP_BYTES

 		Enable compilation of tools/xway-swap-bytes needed for Lantiq
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@ -28,6 +28,7 @@ config TARGET_MALTA
 	select DM_SERIAL
 	select DYNAMIC_IO_PORT_BASE
 	select MIPS_CM
+	select MIPS_INSERT_BOOT_CONFIG
 	select MIPS_L1_CACHE_SHIFT_6
 	select MIPS_L2_CACHE
 	select OF_CONTROL
@ -68,6 +69,22 @@ config ARCH_BMIPS
 	select SYSRESET
 	imply CMD_DM

+config ARCH_MT7620
+	bool "Support MT7620/7688 SoCs"
+	imply CMD_DM
+	select DISPLAY_CPUINFO
+	select DM
+	select DM_SERIAL
+	imply DM_SPI
+	imply DM_SPI_FLASH
+	select MIPS_TUNE_24KC
+	select OF_CONTROL
+	select ROM_EXCEPTION_VECTORS
+	select SUPPORTS_CPU_MIPS32_R1
+	select SUPPORTS_CPU_MIPS32_R2
+	select SUPPORTS_LITTLE_ENDIAN
+	select SYSRESET
+
 config MACH_PIC32
 	bool "Support Microchip PIC32"
 	select DM
@ -120,6 +137,7 @@ source "board/qemu-mips/Kconfig"
 source "arch/mips/mach-ath79/Kconfig"
 source "arch/mips/mach-bmips/Kconfig"
 source "arch/mips/mach-pic32/Kconfig"
+source "arch/mips/mach-mt7620/Kconfig"

 if MIPS

@ -218,6 +236,18 @@ config MIPS_CM_BASE
 	  the GCRs occupy a region of the physical address space which is
 	  otherwise unused, or at minimum that software doesn't need to access.

+config MIPS_CACHE_INDEX_BASE
+	hex "Index base address for cache initialisation"
+	default 0x80000000 if CPU_MIPS32
+	default 0xffffffff80000000 if CPU_MIPS64
+	help
+	  This is the base address for a memory block, which is used for
+	  initialising the cache lines. This is also the base address of a memory
+	  block which is used for loading and filling cache lines when
+	  SYS_MIPS_CACHE_INIT_RAM_LOAD is selected.
+	  Normally this is CKSEG0. If the MIPS system needs to move this block
+	  to some SRAM or ScratchPad RAM, adapt this option accordingly.
+
 endmenu

 menu "OS boot interface"
@ -390,6 +420,28 @@ config MIPS_CM
 	  wish U-Boot to configure it or make use of it to retrieve system
 	  information such as cache configuration.

+config MIPS_INSERT_BOOT_CONFIG
+	bool
+	default n
+	help
+	  Enable this to insert some board-specific boot configuration in
+	  the U-Boot binary at offset 0x10.
+
+config MIPS_BOOT_CONFIG_WORD0
+	hex
+	depends on MIPS_INSERT_BOOT_CONFIG
+	default 0x420 if TARGET_MALTA
+	default 0x0
+	help
+	  Value which is inserted as boot config word 0.
+
+config MIPS_BOOT_CONFIG_WORD1
+	hex
+	depends on MIPS_INSERT_BOOT_CONFIG
+	default 0x0
+	help
+	  Value which is inserted as boot config word 1.
+
 endif

 endmenu
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@ -14,6 +14,7 @@ libs-y += arch/mips/lib/
 machine-$(CONFIG_ARCH_ATH79) += ath79
 machine-$(CONFIG_ARCH_BMIPS) += bmips
 machine-$(CONFIG_MACH_PIC32) += pic32
+machine-$(CONFIG_ARCH_MT7620) += mt7620

 machdirs := $(patsubst %,arch/mips/mach-%/,$(machine-y))
 libs-y += $(machdirs)
--- a/arch/mips/cpu/start.S
+++ b/arch/mips/cpu/start.S
@ -84,25 +84,14 @@ ENTRY(_start)
 	b	reset
 	 mtc0	zero, CP0_COUNT	# clear cp0 count for most accurate boot timing

-#if defined(CONFIG_SYS_XWAY_EBU_BOOTCFG)
+#if defined(CONFIG_MIPS_INSERT_BOOT_CONFIG)
 	/*
-	 * Almost all Lantiq XWAY SoC devices have an external bus unit (EBU) to
-	 * access external NOR flashes. If the board boots from NOR flash the
-	 * internal BootROM does a blind read at address 0xB0000010 to read the
-	 * initial configuration for that EBU in order to access the flash
-	 * device with correct parameters. This config option is board-specific.
+	 * Store some board-specific boot configuration. This is used by some
+	 * MIPS systems like Malta.
 	 */
 	.org 0x10
-	.word CONFIG_SYS_XWAY_EBU_BOOTCFG
-	.word 0x0
-#endif
-#if defined(CONFIG_MALTA)
-	/*
-	 * Linux expects the Board ID here.
-	 */
-	.org 0x10
-	.word 0x00000420	# 0x420 (Malta Board with CoreLV)
-	.word 0x00000000
+	.word CONFIG_MIPS_BOOT_CONFIG_WORD0
+	.word CONFIG_MIPS_BOOT_CONFIG_WORD1
 #endif

 #if defined(CONFIG_ROM_EXCEPTION_VECTORS)
--- a/arch/mips/dts/brcm,bcm6838.dtsi
+++ b/arch/mips/dts/brcm,bcm6838.dtsi
@ -55,6 +55,18 @@
 			u-boot,dm-pre-reloc;
 		};

+		gpio_test_port: syscon@14e00294 {
+			compatible = "syscon";
+			reg = <0x14e00294 0x1c>;
+		};
+
+		pinctrl: pinctrl {
+			compatible = "brcm,bcm6838-pinctrl";
+			regmap = <&gpio_test_port>;
+			brcm,pins-count = <74>;
+			brcm,functions-count = <8>;
+		};
+
 		uart0: serial@14e00500 {
 			compatible = "brcm,bcm6345-uart";
 			reg = <0x14e00500 0x18>;
--- a/arch/mips/dts/gardena-smart-gateway-mt7688.dts
+++ b/arch/mips/dts/gardena-smart-gateway-mt7688.dts
@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Stefan Roese <sr@denx.de>
+ */
+
+/dts-v1/;
+
+#include "mt7628a.dtsi"
+
+/ {
+	compatible = "gardena,smart-gateway-mt7688", "ralink,mt7628a-soc";
+	model = "Gardena smart-Gateway-MT7688";
+
+	aliases {
+		serial0 = &uart0;
+		spi0 = &spi0;
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x08000000>;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,57600";
+		stdout-path = &uart0;
+	};
+};
+
+&uart0 {
+	status = "okay";
+	clock-frequency = <40000000>;
+};
+
+&spi0 {
+	status = "okay";
+	num-cs = <2>;
+
+	spi-flash@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "spi-flash", "jedec,spi-nor";
+		spi-max-frequency = <40000000>;
+		reg = <0>;
+	};
+
+	spi-nand@1 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "spi-nand";
+		spi-max-frequency = <40000000>;
+		reg = <1>;
+	};
+};
--- a/arch/mips/dts/linkit-smart-7688.dts
+++ b/arch/mips/dts/linkit-smart-7688.dts
@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Stefan Roese <sr@denx.de>
+ */
+
+/dts-v1/;
+
+#include "mt7628a.dtsi"
+
+/ {
+	compatible = "seeed,linkit-smart-7688", "ralink,mt7628a-soc";
+	model = "LinkIt-Smart-7688";
+
+	aliases {
+		serial0 = &uart2;
+		spi0 = &spi0;
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x08000000>;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,57600";
+		stdout-path = &uart2;
+	};
+};
+
+&uart2 {
+	status = "okay";
+	clock-frequency = <40000000>;
+};
+
+&spi0 {
+	status = "okay";
+	num-cs = <2>;
+
+	spi-flash@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "spi-flash", "jedec,spi-nor";
+		spi-max-frequency = <25000000>;
+		reg = <0>;
+	};
+};
--- a/arch/mips/dts/mt7628a.dtsi
+++ b/arch/mips/dts/mt7628a.dtsi
@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+	compatible = "ralink,mt7628a-soc";
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu@0 {
+			compatible = "mti,mips24KEc";
+			device_type = "cpu";
+			reg = <0>;
+		};
+	};
+
+	resetc: reset-controller {
+		compatible = "ralink,rt2880-reset";
+		#reset-cells = <1>;
+	};
+
+	cpuintc: interrupt-controller {
+		#address-cells = <0>;
+		#interrupt-cells = <1>;
+		interrupt-controller;
+		compatible = "mti,cpu-interrupt-controller";
+	};
+
+	palmbus@10000000 {
+		compatible = "palmbus", "simple-bus";
+		reg = <0x10000000 0x200000>;
+		ranges = <0x0 0x10000000 0x1FFFFF>;
+
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		sysc: system-controller@0 {
+			compatible = "ralink,mt7620a-sysc", "syscon";
+			reg = <0x0 0x100>;
+		};
+
+		syscon-reboot {
+			compatible = "syscon-reboot";
+			regmap = <&sysc>;
+			offset = <0x34>;
+			mask = <0x1>;
+		};
+
+		intc: interrupt-controller@200 {
+			compatible = "ralink,rt2880-intc";
+			reg = <0x200 0x100>;
+
+			interrupt-controller;
+			#interrupt-cells = <1>;
+
+			resets = <&resetc 9>;
+			reset-names = "intc";
+
+			interrupt-parent = <&cpuintc>;
+			interrupts = <2>;
+
+			ralink,intc-registers = <0x9c 0xa0
+						 0x6c 0xa4
+						 0x80 0x78>;
+		};
+
+		memory-controller@300 {
+			compatible = "ralink,mt7620a-memc";
+			reg = <0x300 0x100>;
+		};
+
+		spi0: spi@b00 {
+			compatible = "ralink,mt7621-spi";
+			reg = <0xb00 0x40>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			clock-frequency = <200000000>;
+		};
+
+		uart0: uartlite@c00 {
+			compatible = "ns16550a";
+			reg = <0xc00 0x100>;
+
+			resets = <&resetc 12>;
+			reset-names = "uart0";
+
+			interrupt-parent = <&intc>;
+			interrupts = <20>;
+
+			reg-shift = <2>;
+		};
+
+		uart1: uart1@d00 {
+			compatible = "ns16550a";
+			reg = <0xd00 0x100>;
+
+			resets = <&resetc 19>;
+			reset-names = "uart1";
+
+			interrupt-parent = <&intc>;
+			interrupts = <21>;
+
+			reg-shift = <2>;
+		};
+
+		uart2: uart2@e00 {
+			compatible = "ns16550a";
+			reg = <0xe00 0x100>;
+
+			resets = <&resetc 20>;
+			reset-names = "uart2";
+
+			interrupt-parent = <&intc>;
+			interrupts = <22>;
+
+			reg-shift = <2>;
+		};
+	};
+
+	usb_phy: usb-phy@10120000 {
+		compatible = "mediatek,mt7628-usbphy";
+		reg = <0x10120000 0x1000>;
+
+		#phy-cells = <0>;
+
+		ralink,sysctl = <&sysc>;
+		resets = <&resetc 22 &resetc 25>;
+		reset-names = "host", "device";
+	};
+
+	ehci@101c0000 {
+		compatible = "generic-ehci";
+		reg = <0x101c0000 0x1000>;
+
+		phys = <&usb_phy>;
+		phy-names = "usb";
+
+		interrupt-parent = <&intc>;
+		interrupts = <18>;
+	};
+};
--- a/arch/mips/include/asm/atomic.h
+++ b/arch/mips/include/asm/atomic.h
@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2016 Cadence Design Systems Inc.
+ */
+
+#ifndef _MIPS_ATOMIC_H
+#define _MIPS_ATOMIC_H
+
+#include <asm/system.h>
+
+typedef struct { volatile int counter; } atomic_t;
+
+#define ATOMIC_INIT(i)	{ (i) }
+
+#define atomic_read(v)		((v)->counter)
+#define atomic_set(v, i)	((v)->counter = (i))
+
+static inline void atomic_add(int i, atomic_t *v)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	v->counter += i;
+	local_irq_restore(flags);
+}
+
+static inline void atomic_sub(int i, atomic_t *v)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	v->counter -= i;
+	local_irq_restore(flags);
+}
+
+static inline void atomic_inc(atomic_t *v)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	++v->counter;
+	local_irq_restore(flags);
+}
+
+static inline void atomic_dec(atomic_t *v)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	--v->counter;
+	local_irq_restore(flags);
+}
+
+#endif
--- a/arch/mips/lib/cache.c
+++ b/arch/mips/lib/cache.c
@ -175,3 +175,23 @@ void invalidate_dcache_range(ulong start_addr, ulong stop)
 	/* ensure cache ops complete before any further memory accesses */
 	sync();
 }
+
+int dcache_status(void)
+{
+	unsigned int cca = read_c0_config() & CONF_CM_CMASK;
+	return cca != CONF_CM_UNCACHED;
+}
+
+void dcache_enable(void)
+{
+	puts("Not supported!\n");
+}
+
+void dcache_disable(void)
+{
+	/* change CCA to uncached */
+	change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
+
+	/* ensure the pipeline doesn't contain now-invalid instructions */
+	instruction_hazard_barrier();
+}
--- a/arch/mips/lib/cache_init.S
+++ b/arch/mips/lib/cache_init.S
@ -14,12 +14,6 @@
 #include <asm/cacheops.h>
 #include <asm/cm.h>

-#ifndef CONFIG_SYS_MIPS_CACHE_MODE
-#define CONFIG_SYS_MIPS_CACHE_MODE CONF_CM_CACHABLE_NONCOHERENT
-#endif
-
-#define INDEX_BASE	CKSEG0
-
 	.macro	f_fill64 dst, offset, val
 	LONG_S	\val, (\offset +  0 * LONGSIZE)(\dst)
 	LONG_S	\val, (\offset +  1 * LONGSIZE)(\dst)
@ -84,6 +78,7 @@
 10:
 	.set	pop
 	.endm
+
 /*
 * mips_cache_reset - low level initialisation of the primary caches
 *
@ -255,7 +250,7 @@ l2_probe_done:
 	/*
 	 * Now clear that much memory starting from zero.
 	 */
-	PTR_LI		a0, CKSEG1
+	PTR_LI		a0, CKSEG1ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
 	PTR_ADDU	a1, a0, v0
 2:	PTR_ADDIU	a0, 64
 	f_fill64	a0, -64, zero
@ -271,7 +266,7 @@ l2_probe_done:
 	bnez		R_L2_BYPASSED, l1_init

 l2_init:
-	PTR_LI		t0, INDEX_BASE
+	PTR_LI		t0, CKSEG0ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
 	PTR_ADDU	t1, t0, R_L2_SIZE
 1:	cache		INDEX_STORE_TAG_SD, 0(t0)
 	PTR_ADDU	t0, t0, R_L2_LINE
@ -307,48 +302,50 @@ l1_init:
 	 * Initialize the I-cache first,
 	 */
 	blez		R_IC_SIZE, 1f
-	PTR_LI		t0, INDEX_BASE
+	PTR_LI		t0, CKSEG0ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
 	PTR_ADDU	t1, t0, R_IC_SIZE
 	/* clear tag to invalidate */
 	cache_loop	t0, t1, R_IC_LINE, INDEX_STORE_TAG_I
 #ifdef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD
 	/* fill once, so data field parity is correct */
-	PTR_LI		t0, INDEX_BASE
+	PTR_LI		t0, CKSEG0ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
 	cache_loop	t0, t1, R_IC_LINE, FILL
 	/* invalidate again - prudent but not strictly neccessary */
-	PTR_LI		t0, INDEX_BASE
+	PTR_LI		t0, CKSEG0ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
 	cache_loop	t0, t1, R_IC_LINE, INDEX_STORE_TAG_I
 #endif
-
-	/* Enable use of the I-cache by setting Config.K0 */
 	sync
-	mfc0		t0, CP0_CONFIG
-	li		t1, CONFIG_SYS_MIPS_CACHE_MODE
-#if __mips_isa_rev >= 2
-	ins		t0, t1, 0, 3
-#else
-	ori		t0, t0, CONF_CM_CMASK
-	xori		t0, t0, CONF_CM_CMASK
+
+	/*
+	 * Enable use of the I-cache by setting Config.K0. The code for this
+	 * must be executed from KSEG1. Jump from KSEG0 to KSEG1 to do this.
+	 * Jump back to KSEG0 after caches are enabled and insert an
+	 * instruction hazard barrier.
+	 */
+	PTR_LA		t0, change_k0_cca
+	li		t1, CPHYSADDR(~0)
+	and		t0, t0, t1
+	PTR_LI		t1, CKSEG1
 	or		t0, t0, t1
-#endif
-	mtc0		t0, CP0_CONFIG
+	li		a0, CONF_CM_CACHABLE_NONCOHERENT
+	jalr.hb		t0

 	/*
 	 * then initialize D-cache.
 	 */
 1:	blez		R_DC_SIZE, 3f
-	PTR_LI		t0, INDEX_BASE
+	PTR_LI		t0, CKSEG0ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
 	PTR_ADDU	t1, t0, R_DC_SIZE
 	/* clear all tags */
 	cache_loop	t0, t1, R_DC_LINE, INDEX_STORE_TAG_D
 #ifdef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD
 	/* load from each line (in cached space) */
-	PTR_LI		t0, INDEX_BASE
+	PTR_LI		t0, CKSEG0ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
 2:	LONG_L		zero, 0(t0)
 	PTR_ADDU	t0, R_DC_LINE
 	bne		t0, t1, 2b
 	/* clear all tags */
-	PTR_LI		t0, INDEX_BASE
+	PTR_LI		t0, CKSEG0ADDR(CONFIG_MIPS_CACHE_INDEX_BASE)
 	cache_loop	t0, t1, R_DC_LINE, INDEX_STORE_TAG_D
 #endif
 3:
@ -391,16 +388,9 @@ l2_unbypass:
 	beqz		t0, 2f

 	/* Change Config.K0 to a coherent CCA */
-	mfc0		t0, CP0_CONFIG
-	li		t1, CONF_CM_CACHABLE_COW
-#if __mips_isa_rev >= 2
-	ins		t0, t1, 0, 3
-#else
-	ori		t0, t0, CONF_CM_CMASK
-	xori		t0, t0, CONF_CM_CMASK
-	or		t0, t0, t1
-#endif
-	mtc0		t0, CP0_CONFIG
+	PTR_LA		t0, change_k0_cca
+	li		a0, CONF_CM_CACHABLE_COW
+	jalr		t0

 	/*
 	 * Join the coherent domain such that the caches of this core are kept
@ -421,51 +411,19 @@ l2_unbypass:
 return:
 	/* Ensure all cache operations complete before returning */
 	sync
-	jr	ra
+	jr	R_RETURN
 	END(mips_cache_reset)

-/*
- * dcache_status - get cache status
- *
- * RETURNS: 0 - cache disabled; 1 - cache enabled
- *
- */
-LEAF(dcache_status)
-	mfc0	t0, CP0_CONFIG
-	li	t1, CONF_CM_UNCACHED
-	andi	t0, t0, CONF_CM_CMASK
-	move	v0, zero
-	beq	t0, t1, 2f
-	li	v0, 1
-2:	jr	ra
-	END(dcache_status)
+LEAF(change_k0_cca)
+	mfc0		t0, CP0_CONFIG
+#if __mips_isa_rev >= 2
+	ins		t0, a0, 0, 3
+#else
+	xor		a0, a0, t0
+	andi		a0, a0, CONF_CM_CMASK
+	xor		a0, a0, t0
+#endif
+	mtc0		a0, CP0_CONFIG

-/*
- * dcache_disable - disable cache
- *
- * RETURNS: N/A
- *
- */
-LEAF(dcache_disable)
-	mfc0	t0, CP0_CONFIG
-	li	t1, -8
-	and	t0, t0, t1
-	ori	t0, t0, CONF_CM_UNCACHED
-	mtc0	t0, CP0_CONFIG
-	jr	ra
-	END(dcache_disable)
-
-/*
- * dcache_enable - enable cache
- *
- * RETURNS: N/A
- *
- */
-LEAF(dcache_enable)
-	mfc0	t0, CP0_CONFIG
-	ori	t0, CONF_CM_CMASK
-	xori	t0, CONF_CM_CMASK
-	ori	t0, CONFIG_SYS_MIPS_CACHE_MODE
-	mtc0	t0, CP0_CONFIG
-	jr	ra
-	END(dcache_enable)
+	jr.hb		ra
+	END(change_k0_cca)
--- a/arch/mips/mach-mt7620/Kconfig
+++ b/arch/mips/mach-mt7620/Kconfig
@ -0,0 +1,135 @@
+menu "MediaTek MIPS platforms"
+	depends on ARCH_MT7620
+
+config SYS_MALLOC_F_LEN
+	default 0x1000
+
+config SYS_SOC
+	default "mt7620" if SOC_MT7620
+
+choice
+	prompt "MediaTek MIPS SoC select"
+
+config SOC_MT7620
+	bool "MT7620/8"
+	select MIPS_L1_CACHE_SHIFT_5
+	help
+	  This supports MediaTek MIPS MT7620 family.
+
+endchoice
+
+choice
+	prompt "Board select"
+
+config BOARD_GARDENA_SMART_GATEWAY_MT7688
+	bool "Gardena Smart Gateway"
+	depends on SOC_MT7620
+	select SUPPORTS_BOOT_RAM
+	help
+	  Gardena Smart Gateway boards have a MT7688 SoC with 128 MiB of RAM
+	  and 8 MiB of flash (SPI NOR) and additional SPI NAND storage.
+
+config BOARD_LINKIT_SMART_7688
+	bool "LinkIt Smart 7688"
+	depends on SOC_MT7620
+	select SUPPORTS_BOOT_RAM
+	help
+	  Seeed LinkIt Smart 7688 boards have a MT7688 SoC with 128 MiB of RAM
+	  and 32 MiB of flash (SPI).
+	  Between its different peripherals there's an integrated switch with 4
+	  ethernet ports, 1 USB port, 1 UART, GPIO buttons and LEDs, and
+	  a MT7688 (PCIe).
+
+endchoice
+
+choice
+	prompt "Boot mode"
+
+config BOOT_RAM
+	bool "RAM boot"
+	depends on SUPPORTS_BOOT_RAM
+	help
+	  This builds an image that is linked to a RAM address. It can be used
+	  for booting from CFE via TFTP using an ELF image, but it can also be
+	  booted from RAM by other bootloaders using a BIN image.
+
+config BOOT_ROM
+	bool "ROM boot"
+	depends on SUPPORTS_BOOT_RAM
+	help
+	  This builds an image that is linked to a ROM address. It can be
+	  used as main bootloader image which is programmed onto the onboard
+	  flash storage (SPI NOR).
+
+endchoice
+
+choice
+	prompt "DDR2 size"
+
+config ONBOARD_DDR2_SIZE_256MBIT
+	bool "256MBit (32MByte) total size"
+	depends on BOOT_ROM
+	help
+	  Use 256MBit (32MByte) of DDR total size
+
+config ONBOARD_DDR2_SIZE_512MBIT
+	bool "512MBit (64MByte) total size"
+	depends on BOOT_ROM
+	help
+	  Use 512MBit (64MByte) of DDR total size
+
+config ONBOARD_DDR2_SIZE_1024MBIT
+	bool "1024MBit (128MByte) total size"
+	depends on BOOT_ROM
+	help
+	  Use 1024MBit (128MByte) of DDR total size
+
+config ONBOARD_DDR2_SIZE_2048MBIT
+	bool "2048MBit (256MByte) total size"
+	depends on BOOT_ROM
+	help
+	  Use 2048MBit (256MByte) of DDR total size
+
+endchoice
+
+choice
+	prompt "DDR2 chip width"
+
+config ONBOARD_DDR2_CHIP_WIDTH_8BIT
+	bool "8bit DDR chip width"
+	depends on BOOT_ROM
+	help
+	  Use DDR chips with 8bit width
+
+config ONBOARD_DDR2_CHIP_WIDTH_16BIT
+	bool "16bit DDR chip width"
+	depends on BOOT_ROM
+	help
+	  Use DDR chips with 16bit width
+
+endchoice
+
+choice
+	prompt "DDR2 bus width"
+
+config ONBOARD_DDR2_BUS_WIDTH_16BIT
+	bool "16bit DDR bus width"
+	depends on BOOT_ROM
+	help
+	  Use 16bit DDR bus width
+
+config ONBOARD_DDR2_BUS_WIDTH_32BIT
+	bool "32bit DDR bus width"
+	depends on BOOT_ROM
+	help
+	  Use 32bit DDR bus width
+
+endchoice
+
+config SUPPORTS_BOOT_RAM
+	bool
+
+source "board/gardena/smart-gateway-mt7688/Kconfig"
+source "board/seeed/linkit-smart-7688/Kconfig"
+
+endmenu
--- a/arch/mips/mach-mt7620/Makefile
+++ b/arch/mips/mach-mt7620/Makefile
@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0+
+
+obj-y += cpu.o
+
+ifndef CONFIG_SKIP_LOWLEVEL_INIT
+obj-y += ddr_calibrate.o
+obj-y += lowlevel_init.o
+endif
--- a/arch/mips/mach-mt7620/cpu.c
+++ b/arch/mips/mach-mt7620/cpu.c
@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Stefan Roese <sr@denx.de>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <ram.h>
+#include <asm/io.h>
+#include <linux/io.h>
+#include <linux/sizes.h>
+#include "mt76xx.h"
+
+#define STR_LEN			6
+
+#ifdef CONFIG_BOOT_ROM
+int mach_cpu_init(void)
+{
+	ddr_calibrate();
+
+	return 0;
+}
+#endif
+
+int dram_init(void)
+{
+	gd->ram_size = get_ram_size((void *)CONFIG_SYS_SDRAM_BASE, SZ_256M);
+
+	return 0;
+}
+
+int print_cpuinfo(void)
+{
+	static const char * const boot_str[] = { "PLL (3-Byte SPI Addr)",
+						 "PLL (4-Byte SPI Addr)",
+						 "XTAL (3-Byte SPI Addr)",
+						 "XTAL (4-Byte SPI Addr)" };
+	const void *blob = gd->fdt_blob;
+	void __iomem *sysc_base;
+	char buf[STR_LEN + 1];
+	fdt_addr_t base;
+	fdt_size_t size;
+	char *str;
+	int node;
+	u32 val;
+
+	/* Get system controller base address */
+	node = fdt_node_offset_by_compatible(blob, -1, "ralink,mt7620a-sysc");
+	if (node < 0)
+		return -FDT_ERR_NOTFOUND;
+
+	base = fdtdec_get_addr_size_auto_noparent(blob, node, "reg",
+						  0, &size, true);
+	if (base == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	sysc_base = ioremap_nocache(base, size);
+
+	str = (char *)sysc_base + MT76XX_CHIPID_OFFS;
+	snprintf(buf, STR_LEN + 1, "%s", str);
+	val = readl(sysc_base + MT76XX_CHIP_REV_ID_OFFS);
+	printf("CPU:   %-*s Rev %ld.%ld - ", STR_LEN, buf,
+	       (val & GENMASK(11, 8)) >> 8, val & GENMASK(3, 0));
+
+	val = (readl(sysc_base + MT76XX_SYSCFG0_OFFS) & GENMASK(3, 1)) >> 1;
+	printf("Boot from %s\n", boot_str[val]);
+
+	return 0;
+}
--- a/arch/mips/mach-mt7620/ddr_calibrate.c
+++ b/arch/mips/mach-mt7620/ddr_calibrate.c
@ -0,0 +1,308 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Stefan Roese <sr@denx.de>
+ *
+ * This code is mostly based on the code extracted from this MediaTek
+ * github repository:
+ *
+ * https://github.com/MediaTek-Labs/linkit-smart-uboot.git
+ *
+ * I was not able to find a specific license or other developers
+ * copyrights here, so I can't add them here.
+ *
+ * Most functions in this file are copied from the MediaTek U-Boot
+ * repository. Without any documentation, it was impossible to really
+ * implement this differently. So its mostly a cleaned-up version of
+ * the original code, with only support for the MT7628 / MT7688 SoC.
+ */
+
+#include <common.h>
+#include <linux/io.h>
+#include <asm/cacheops.h>
+#include <asm/io.h>
+#include "mt76xx.h"
+
+#define NUM_OF_CACHELINE	128
+#define MIN_START		6
+#define MIN_FINE_START		0xf
+#define MAX_START		7
+#define MAX_FINE_START		0x0
+
+#define CPU_FRAC_DIV		1
+
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_256MBIT)
+#define DRAM_BUTTOM 0x02000000
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_512MBIT)
+#define DRAM_BUTTOM 0x04000000
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_1024MBIT)
+#define DRAM_BUTTOM 0x08000000
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_2048MBIT)
+#define DRAM_BUTTOM 0x10000000
+#endif
+
+static inline void cal_memcpy(void *src, void *dst, u32 size)
+{
+	u8 *psrc = (u8 *)src;
+	u8 *pdst = (u8 *)dst;
+	int i;
+
+	for (i = 0; i < size; i++, psrc++, pdst++)
+		*pdst = *psrc;
+}
+
+static inline void cal_memset(void *src, u8 pat, u32 size)
+{
+	u8 *psrc = (u8 *)src;
+	int i;
+
+	for (i = 0; i < size; i++, psrc++)
+		*psrc = pat;
+}
+
+#define pref_op(hint, addr)						\
+	__asm__ __volatile__(						\
+		".set	push\n"						\
+		".set	noreorder\n"					\
+		"pref	%0, %1\n"					\
+		".set	pop\n"						\
+		:							\
+		: "i" (hint), "R" (*(u8 *)(addr)))
+
+static inline void cal_patgen(u32 start_addr, u32 size, u32 bias)
+{
+	u32 *addr = (u32 *)start_addr;
+	int i;
+
+	for (i = 0; i < size; i++)
+		addr[i] = start_addr + i + bias;
+}
+
+static inline int test_loop(int k, int dqs, u32 test_dqs, u32 *coarse_dqs,
+			    u32 offs, u32 pat, u32 val)
+{
+	u32 nc_addr;
+	u32 *c_addr;
+	int i;
+
+	for (nc_addr = 0xa0000000;
+	     nc_addr < (0xa0000000 + DRAM_BUTTOM - NUM_OF_CACHELINE * 32);
+	     nc_addr += (DRAM_BUTTOM >> 6) + offs) {
+		writel(0x00007474, (void *)MT76XX_MEMCTRL_BASE + 0x64);
+		wmb();		/* Make sure store if finished */
+
+		c_addr = (u32 *)(nc_addr & 0xdfffffff);
+		cal_memset(((u8 *)c_addr), 0x1F, NUM_OF_CACHELINE * 32);
+		cal_patgen(nc_addr, NUM_OF_CACHELINE * 8, pat);
+
+		if (dqs > 0)
+			writel(0x00000074 |
+			       (((k == 1) ? coarse_dqs[dqs] : test_dqs) << 12) |
+			       (((k == 0) ? val : test_dqs) << 8),
+			       (void *)MT76XX_MEMCTRL_BASE + 0x64);
+		else
+			writel(0x00007400 |
+			       (((k == 1) ? coarse_dqs[dqs] : test_dqs) << 4) |
+			       (((k == 0) ? val : test_dqs) << 0),
+			       (void *)MT76XX_MEMCTRL_BASE + 0x64);
+		wmb();		/* Make sure store if finished */
+
+		invalidate_dcache_range((u32)c_addr,
+					(u32)c_addr +
+					NUM_OF_CACHELINE * 32);
+		wmb();		/* Make sure store if finished */
+
+		for (i = 0; i < NUM_OF_CACHELINE * 8; i++) {
+			if (i % 8 == 0)
+				pref_op(0, &c_addr[i]);
+		}
+
+		for (i = 0; i < NUM_OF_CACHELINE * 8; i++) {
+			if (c_addr[i] != nc_addr + i + pat)
+				return -1;
+		}
+	}
+
+	return 0;
+}
+
+void ddr_calibrate(void)
+{
+	u32 min_coarse_dqs[2];
+	u32 max_coarse_dqs[2];
+	u32 min_fine_dqs[2];
+	u32 max_fine_dqs[2];
+	u32 coarse_dqs[2];
+	u32 fine_dqs[2];
+	int reg = 0, ddr_cfg2_reg;
+	int flag;
+	int i, k;
+	int dqs = 0;
+	u32 min_coarse_dqs_bnd, min_fine_dqs_bnd, coarse_dqs_dll, fine_dqs_dll;
+	u32 val;
+	u32 fdiv = 0, frac = 0;
+
+	/* Setup clock to run at full speed */
+	val = readl((void *)MT76XX_DYN_CFG0_REG);
+	fdiv = (u32)((val >> 8) & 0x0F);
+	if (CPU_FRAC_DIV < 1 || CPU_FRAC_DIV > 10)
+		frac = val & 0x0f;
+	else
+		frac = CPU_FRAC_DIV;
+
+	while (frac < fdiv) {
+		val = readl((void *)MT76XX_DYN_CFG0_REG);
+		fdiv = (val >> 8) & 0x0f;
+		fdiv--;
+		val &= ~(0x0f << 8);
+		val |= (fdiv << 8);
+		writel(val, (void *)MT76XX_DYN_CFG0_REG);
+		udelay(500);
+		val = readl((void *)MT76XX_DYN_CFG0_REG);
+		fdiv = (val >> 8) & 0x0f;
+	}
+
+	clrbits_le32((void *)MT76XX_MEMCTRL_BASE + 0x10, BIT(4));
+	ddr_cfg2_reg = readl((void *)MT76XX_MEMCTRL_BASE + 0x48);
+	clrbits_le32((void *)MT76XX_MEMCTRL_BASE + 0x48,
+		     (0x3 << 28) | (0x3 << 26));
+
+	min_coarse_dqs[0] = MIN_START;
+	min_coarse_dqs[1] = MIN_START;
+	min_fine_dqs[0] = MIN_FINE_START;
+	min_fine_dqs[1] = MIN_FINE_START;
+	max_coarse_dqs[0] = MAX_START;
+	max_coarse_dqs[1] = MAX_START;
+	max_fine_dqs[0] = MAX_FINE_START;
+	max_fine_dqs[1] = MAX_FINE_START;
+	dqs = 0;
+
+	/* Add by KP, DQS MIN boundary */
+	reg = readl((void *)MT76XX_MEMCTRL_BASE + 0x20);
+	coarse_dqs_dll = (reg & 0xf00) >> 8;
+	fine_dqs_dll = (reg & 0xf0) >> 4;
+	if (coarse_dqs_dll <= 8)
+		min_coarse_dqs_bnd = 8 - coarse_dqs_dll;
+	else
+		min_coarse_dqs_bnd = 0;
+
+	if (fine_dqs_dll <= 8)
+		min_fine_dqs_bnd = 8 - fine_dqs_dll;
+	else
+		min_fine_dqs_bnd = 0;
+	/* DQS MIN boundary */
+
+DQS_CAL:
+
+	for (k = 0; k < 2; k++) {
+		u32 test_dqs;
+
+		if (k == 0)
+			test_dqs = MAX_START;
+		else
+			test_dqs = MAX_FINE_START;
+
+		do {
+			flag = test_loop(k, dqs, test_dqs, max_coarse_dqs,
+					 0x400, 0x3, 0xf);
+			if (flag == -1)
+				break;
+
+			test_dqs++;
+		} while (test_dqs <= 0xf);
+
+		if (k == 0) {
+			max_coarse_dqs[dqs] = test_dqs;
+		} else {
+			test_dqs--;
+
+			if (test_dqs == MAX_FINE_START - 1) {
+				max_coarse_dqs[dqs]--;
+				max_fine_dqs[dqs] = 0xf;
+			} else {
+				max_fine_dqs[dqs] = test_dqs;
+			}
+		}
+	}
+
+	for (k = 0; k < 2; k++) {
+		u32 test_dqs;
+
+		if (k == 0)
+			test_dqs = MIN_START;
+		else
+			test_dqs = MIN_FINE_START;
+
+		do {
+			flag = test_loop(k, dqs, test_dqs, min_coarse_dqs,
+					 0x480, 0x1, 0x0);
+			if (k == 0) {
+				if (flag == -1 ||
+				    test_dqs == min_coarse_dqs_bnd)
+					break;
+
+				test_dqs--;
+
+				if (test_dqs < min_coarse_dqs_bnd)
+					break;
+			} else {
+				if (flag == -1) {
+					test_dqs++;
+					break;
+				} else if (test_dqs == min_fine_dqs_bnd) {
+					break;
+				}
+
+				test_dqs--;
+
+				if (test_dqs < min_fine_dqs_bnd)
+					break;
+			}
+		} while (test_dqs >= 0);
+
+		if (k == 0) {
+			min_coarse_dqs[dqs] = test_dqs;
+		} else {
+			if (test_dqs == MIN_FINE_START + 1) {
+				min_coarse_dqs[dqs]++;
+				min_fine_dqs[dqs] = 0x0;
+			} else {
+				min_fine_dqs[dqs] = test_dqs;
+			}
+		}
+	}
+
+	if (dqs == 0) {
+		dqs = 1;
+		goto DQS_CAL;
+	}
+
+	for (i = 0; i < 2; i++) {
+		u32 temp;
+
+		coarse_dqs[i] = (max_coarse_dqs[i] + min_coarse_dqs[i]) >> 1;
+		temp =
+		    (((max_coarse_dqs[i] + min_coarse_dqs[i]) % 2) * 4) +
+		    ((max_fine_dqs[i] + min_fine_dqs[i]) >> 1);
+		if (temp >= 0x10) {
+			coarse_dqs[i]++;
+			fine_dqs[i] = (temp - 0x10) + 0x8;
+		} else {
+			fine_dqs[i] = temp;
+		}
+	}
+	reg = (coarse_dqs[1] << 12) | (fine_dqs[1] << 8) |
+		(coarse_dqs[0] << 4) | fine_dqs[0];
+
+	clrbits_le32((void *)MT76XX_MEMCTRL_BASE + 0x10, BIT(4));
+	writel(reg, (void *)MT76XX_MEMCTRL_BASE + 0x64);
+	writel(ddr_cfg2_reg, (void *)MT76XX_MEMCTRL_BASE + 0x48);
+	setbits_le32((void *)MT76XX_MEMCTRL_BASE + 0x10, BIT(4));
+
+	for (i = 0; i < 2; i++)
+		debug("[%02X%02X%02X%02X]", min_coarse_dqs[i],
+		      min_fine_dqs[i], max_coarse_dqs[i], max_fine_dqs[i]);
+	debug("\nDDR Calibration DQS reg = %08X\n", reg);
+}
--- a/arch/mips/mach-mt7620/lowlevel_init.S
+++ b/arch/mips/mach-mt7620/lowlevel_init.S
@ -0,0 +1,322 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (c) 2018 Stefan Roese <sr@denx.de>
+ *
+ * This code is mostly based on the code extracted from this MediaTek
+ * github repository:
+ *
+ * https://github.com/MediaTek-Labs/linkit-smart-uboot.git
+ *
+ * I was not able to find a specific license or other developers
+ * copyrights here, so I can't add them here.
+ */
+
+#include <config.h>
+#include <asm/regdef.h>
+#include <asm/mipsregs.h>
+#include <asm/addrspace.h>
+#include <asm/asm.h>
+#include "mt76xx.h"
+
+#ifndef BIT
+#define BIT(nr)			(1 << (nr))
+#endif
+
+#define DELAY_USEC(us)		((us) / 100)
+
+#define DDR_CFG1_CHIP_WIDTH_MASK (0x3 << 16)
+#define DDR_CFG1_BUS_WIDTH_MASK	(0x3 << 12)
+
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_256MBIT)
+#define DDR_CFG1_SIZE_VAL	0x222e2323
+#define DDR_CFG4_SIZE_VAL	7
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_512MBIT)
+#define DDR_CFG1_SIZE_VAL	0x22322323
+#define DDR_CFG4_SIZE_VAL	9
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_1024MBIT)
+#define DDR_CFG1_SIZE_VAL	0x22362323
+#define DDR_CFG4_SIZE_VAL	9
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_2048MBIT)
+#define DDR_CFG1_SIZE_VAL	0x223a2323
+#define DDR_CFG4_SIZE_VAL	9
+#endif
+
+#if defined(CONFIG_ONBOARD_DDR2_CHIP_WIDTH_8BIT)
+#define DDR_CFG1_CHIP_WIDTH_VAL	(0x1 << 16)
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_CHIP_WIDTH_16BIT)
+#define DDR_CFG1_CHIP_WIDTH_VAL	(0x2 << 16)
+#endif
+
+#if defined(CONFIG_ONBOARD_DDR2_BUS_WIDTH_16BIT)
+#define DDR_CFG1_BUS_WIDTH_VAL	(0x2 << 12)
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_BUS_WIDTH_32BIT)
+#define DDR_CFG1_BUS_WIDTH_VAL	(0x3 << 12)
+#endif
+
+	.set noreorder
+
+LEAF(lowlevel_init)
+
+	/* Load base addresses as physical addresses for later usage */
+	li	s0, CKSEG1ADDR(MT76XX_SYSCTL_BASE)
+	li	s1, CKSEG1ADDR(MT76XX_MEMCTRL_BASE)
+	li	s2, CKSEG1ADDR(MT76XX_RGCTRL_BASE)
+
+	/* polling CPLL is ready */
+	li	t1, DELAY_USEC(1000000)
+	la	t5, MT76XX_ROM_STATUS_REG
+1:
+	lw	t2, 0(t5)
+	andi	t2, t2, 0x1
+	bnez	t2, CPLL_READY
+	subu	t1, t1, 1
+	bgtz	t1, 1b
+	nop
+	la      t0, MT76XX_CLKCFG0_REG
+	lw      t3, 0(t0)
+	ori	t3, t3, 0x1
+	sw	t3, 0(t0)
+	b	CPLL_DONE
+	nop
+CPLL_READY:
+	la	t0, MT76XX_CLKCFG0_REG
+	lw	t1, 0(t0)
+	li	t2, ~0x0c
+	and	t1, t1, t2
+	ori	t1, t1, 0xc
+	sw	t1, 0(t0)
+	la	t0, MT76XX_DYN_CFG0_REG
+	lw	t3, 0(t0)
+	li	t5, ~((0x0f << 8) | (0x0f << 0))
+	and	t3, t3, t5
+	li	t5, (10 << 8) | (1 << 0)
+	or	t3, t3, t5
+	sw	t3, 0(t0)
+	la	t0, MT76XX_CLKCFG0_REG
+	lw	t3, 0(t0)
+	li	t4, ~0x0F
+	and     t3, t3, t4
+	ori	t3, t3, 0xc
+	sw	t3, 0(t0)
+	lw	t3, 0(t0)
+	ori	t3, t3, 0x08
+	sw	t3, 0(t0)
+
+CPLL_DONE:
+	/*
+	 * SDR and DDR initialization: delay 200us
+	 */
+	li	t0, DELAY_USEC(200 + 40)
+	li	t1, 0x1
+1:
+	sub	t0, t0, t1
+	bnez	t0, 1b
+	nop
+
+	/* set DRAM IO PAD for MT7628IC */
+	/* DDR LDO Enable  */
+	lw	t4, 0x100(s2)
+	li	t2, BIT(31)
+	or	t4, t4, t2
+	sw	t4, 0x100(s2)
+	lw	t4, 0x10c(s2)
+	j	LDO_1P8V
+	nop
+LDO_1P8V:
+	li	t2, ~BIT(6)
+	and	t4, t4, t2
+	sw	t4, 0x10c(s2)
+	j	DDRLDO_SOFT_START
+LDO_2P5V:
+	/* suppose external DDR1 LDO 2.5V */
+	li	t2, BIT(6)
+	or	t4, t4, t2
+	sw	t4, 0x10c(s2)
+
+DDRLDO_SOFT_START:
+	lw	t2, 0x10c(s2)
+	li	t3, BIT(16)
+	or	t2, t2, t3
+	sw	t2, 0x10c(s2)
+	li	t3, DELAY_USEC(250*50)
+LDO_DELAY:
+	subu	t3, t3, 1
+	bnez	t3, LDO_DELAY
+	nop
+
+	lw	t2, 0x10c(s2)
+	li	t3, BIT(18)
+	or	t2, t2, t3
+	sw	t2, 0x10c(s2)
+
+SET_RG_BUCK_FPWM:
+	lw	t2, 0x104(s2)
+	ori	t2, t2, BIT(10)
+	sw	t2, 0x104(s2)
+
+DDR_PAD_CFG:
+	/* clean CLK PAD */
+	lw	t2, 0x704(s2)
+	li	t8, 0xfffff0f0
+	and	t2, t2, t8
+	/* clean CMD PAD */
+	lw	t3, 0x70c(s2)
+	li	t8, 0xfffff0f0
+	and	t3, t3, t8
+	/* clean DQ IPAD */
+	lw	t4, 0x710(s2)
+	li	t8, 0xfffff8ff
+	and	t4, t4, t8
+	/* clean DQ OPAD */
+	lw	t5, 0x714(s2)
+	li	t8, 0xfffff0f0
+	and	t5, t5, t8
+	/* clean DQS IPAD */
+	lw	t6, 0x718(s2)
+	li	t8, 0xfffff8ff
+	and	t6, t6, t8
+	/* clean DQS OPAD */
+	lw	t7, 0x71c(s2)
+	li	t8, 0xfffff0f0
+	and	t7, t7, t8
+
+	lw	t9, 0xc(s0)
+	srl	t9, t9, 16
+	andi	t9, t9, 0x1
+	bnez	t9, MT7628_AN_DDR1_PAD
+MT7628_KN_PAD:
+	li	t8, 0x00000303
+	or	t2, t2, t8
+	or	t3, t3, t8
+	or	t5, t5, t8
+	or	t7, t7, t8
+	li	t8, 0x00000000
+	or	t4, t4, t8
+	or	t6, t6, t8
+	j	SET_PAD_CFG
+MT7628_AN_DDR1_PAD:
+	lw	t1, 0x10(s0)
+	andi	t1, t1, 0x1
+	beqz	t1, MT7628_AN_DDR2_PAD
+	li	t8, 0x00000c0c
+	or	t2, t2, t8
+	li	t8, 0x00000202
+	or	t3, t3, t8
+	li	t8, 0x00000707
+	or	t5, t5, t8
+	li	t8, 0x00000c0c
+	or	t7, t7, t8
+	li	t8, 0x00000000
+	or	t4, t4, t8
+	or	t6, t6, t8
+	j	SET_PAD_CFG
+MT7628_AN_DDR2_PAD:
+	li	t8, 0x00000c0c
+	or	t2, t2, t8
+	li	t8, 0x00000202
+	or	t3, t3, t8
+	li	t8, 0x00000404
+	or	t5, t5, t8
+	li	t8, 0x00000c0c
+	or	t7, t7, t8
+	li	t8, 0x00000000		/* ODT off */
+	or	t4, t4, t8
+	or	t6, t6, t8
+
+SET_PAD_CFG:
+	sw	t2, 0x704(s2)
+	sw	t3, 0x70c(s2)
+	sw	t4, 0x710(s2)
+	sw	t5, 0x714(s2)
+	sw	t6, 0x718(s2)
+	sw	t7, 0x71c(s2)
+
+	/*
+	 * DDR initialization: reset pin to 0
+	 */
+	lw	t2, 0x34(s0)
+	and	t2, ~BIT(10)
+	sw	t2, 0x34(s0)
+	nop
+
+	/*
+	 * DDR initialization: wait til reg DDR_CFG1 bit 21 equal to 1 (ready)
+	 */
+DDR_READY:
+	li	t1, DDR_CFG1_REG
+	lw	t0, 0(t1)
+	nop
+	and	t2, t0, BIT(21)
+	beqz	t2, DDR_READY
+	nop
+
+	/*
+	 * DDR initialization
+	 *
+	 * Only DDR2 supported right now. DDR2 support can be added, once
+	 * boards using it will get added to mainline U-Boot.
+	 */
+	li	t1, DDR_CFG2_REG
+	lw	t0, 0(t1)
+	nop
+	and	t0, ~BIT(30)
+	and	t0, ~(7 << 4)
+	or	t0, (4 << 4)
+	or	t0, BIT(30)
+	or	t0, BIT(11)
+	sw	t0, 0(t1)
+	nop
+
+	li	t1, DDR_CFG3_REG
+	lw	t2, 0(t1)
+	/* Disable ODT; reference board ok, ev board fail */
+	and	t2, ~BIT(6)
+	or	t2, BIT(2)
+	li	t0, DDR_CFG4_REG
+	lw	t1, 0(t0)
+	li	t2, ~(0x01f | 0x0f0)
+	and	t1, t1, t2
+	ori	t1, t1, DDR_CFG4_SIZE_VAL
+	sw	t1, 0(t0)
+	nop
+
+	/*
+	 * DDR initialization: config size and width on reg DDR_CFG1
+	 */
+	li	t6, DDR_CFG1_SIZE_VAL
+
+	and	t6, ~DDR_CFG1_CHIP_WIDTH_MASK
+	or	t6, DDR_CFG1_CHIP_WIDTH_VAL
+
+	/* CONFIG DDR_CFG1[13:12] about TOTAL WIDTH */
+	and	t6, ~DDR_CFG1_BUS_WIDTH_MASK
+	or	t6, DDR_CFG1_BUS_WIDTH_VAL
+
+	li	t5, DDR_CFG1_REG
+	sw	t6, 0(t5)
+	nop
+
+	/*
+	 * DDR: enable self auto refresh for power saving
+	 * enable it by default for both RAM and ROM version (for CoC)
+	 */
+	lw	t1, 0x14(s1)
+	nop
+	and	t1, 0xff000000
+	or	t1, 0x01
+	sw	t1, 0x14(s1)
+	nop
+	lw	t1, 0x10(s1)
+	nop
+	or	t1, 0x10
+	sw	t1, 0x10(s1)
+	nop
+
+	jr	ra
+	nop
+	END(lowlevel_init)
--- a/arch/mips/mach-mt7620/mt76xx.h
+++ b/arch/mips/mach-mt7620/mt76xx.h
@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 Stefan Roese <sr@denx.de>
+ */
+
+#ifndef __MT76XX_H
+#define __MT76XX_H
+
+#define MT76XX_SYSCTL_BASE	0x10000000
+
+#define MT76XX_CHIPID_OFFS	0x00
+#define MT76XX_CHIP_REV_ID_OFFS	0x0c
+#define MT76XX_SYSCFG0_OFFS	0x10
+
+#define MT76XX_MEMCTRL_BASE	(MT76XX_SYSCTL_BASE + 0x0300)
+#define MT76XX_RGCTRL_BASE	(MT76XX_SYSCTL_BASE + 0x1000)
+
+#define MT76XX_ROM_STATUS_REG	(MT76XX_SYSCTL_BASE + 0x0028)
+#define MT76XX_CLKCFG0_REG	(MT76XX_SYSCTL_BASE + 0x002c)
+#define MT76XX_DYN_CFG0_REG	(MT76XX_SYSCTL_BASE + 0x0440)
+
+#define DDR_CFG1_REG		(MT76XX_MEMCTRL_BASE + 0x44)
+#define DDR_CFG2_REG		(MT76XX_MEMCTRL_BASE + 0x48)
+#define DDR_CFG3_REG		(MT76XX_MEMCTRL_BASE + 0x4c)
+#define DDR_CFG4_REG		(MT76XX_MEMCTRL_BASE + 0x50)
+
+#ifndef __ASSEMBLY__
+/* Prototypes */
+void ddr_calibrate(void);
+#endif
+
+#endif
--- a/board/gardena/smart-gateway-mt7688/Kconfig
+++ b/board/gardena/smart-gateway-mt7688/Kconfig
@ -0,0 +1,12 @@
+if BOARD_GARDENA_SMART_GATEWAY_MT7688
+
+config SYS_BOARD
+	default "smart-gateway-mt7688"
+
+config SYS_VENDOR
+	default "gardena"
+
+config SYS_CONFIG_NAME
+	default "gardena-smart-gateway-mt7688"
+
+endif
--- a/board/gardena/smart-gateway-mt7688/MAINTAINERS
+++ b/board/gardena/smart-gateway-mt7688/MAINTAINERS
@ -0,0 +1,8 @@
+GARDENA_SMART_GATEWAY_MT7688 BOARD
+M:	Stefan Roese <sr@denx.de>
+S:	Maintained
+F:	board/gardena/smart-gateway-mt7688
+F:	include/configs/gardena-smart-gateway-mt7688.h
+F:	configs/gardena-smart-gateway-mt7688_defconfig
+F:	configs/gardena-smart-gateway-mt7688-ram_defconfig
+F:	arch/mips/dts/gardena-smart-gateway-mt7688.dts
--- a/board/gardena/smart-gateway-mt7688/Makefile
+++ b/board/gardena/smart-gateway-mt7688/Makefile
@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0+
+
+obj-y += board.o
--- a/board/gardena/smart-gateway-mt7688/board.c
+++ b/board/gardena/smart-gateway-mt7688/board.c
@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Stefan Roese <sr@denx.de>
+ */
+
+#include <common.h>
+#include <asm/io.h>
+
+int board_early_init_f(void)
+{
+	/*
+	 * Nothing to be done here for this board (no UART setup etc)
+	 * right now. We might need some pin muxing, so lets keep this
+	 * function for now.
+	 */
+	return 0;
+}
--- a/board/seeed/linkit-smart-7688/Kconfig
+++ b/board/seeed/linkit-smart-7688/Kconfig
@ -0,0 +1,12 @@
+if BOARD_LINKIT_SMART_7688
+
+config SYS_BOARD
+	default "linkit-smart-7688"
+
+config SYS_VENDOR
+	default "seeed"
+
+config SYS_CONFIG_NAME
+	default "linkit-smart-7688"
+
+endif
--- a/board/seeed/linkit-smart-7688/MAINTAINERS
+++ b/board/seeed/linkit-smart-7688/MAINTAINERS
@ -0,0 +1,8 @@
+LINKIT_SMART_7688 BOARD
+M:	Stefan Roese <sr@denx.de>
+S:	Maintained
+F:	board/seeed/linkit-smart-7688
+F:	include/configs/linkit-smart-7688.h
+F:	configs/linkit-smart-7688_defconfig
+F:	configs/linkit-smart-7688_ram_defconfig
+F:	arch/mips/dts/linkit-smart-7688.dts
--- a/board/seeed/linkit-smart-7688/Makefile
+++ b/board/seeed/linkit-smart-7688/Makefile
@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0+
+
+obj-y += board.o
--- a/board/seeed/linkit-smart-7688/board.c
+++ b/board/seeed/linkit-smart-7688/board.c
@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Stefan Roese <sr@denx.de>
+ */
+
+#include <common.h>
+#include <asm/io.h>
+
+#define MT76XX_GPIO1_MODE	0xb0000060
+
+void board_debug_uart_init(void)
+{
+	/* Select UART2 mode instead of GPIO mode (default) */
+	clrbits_le32((void __iomem *)MT76XX_GPIO1_MODE, GENMASK(27, 26));
+}
+
+int board_early_init_f(void)
+{
+	/*
+	 * The pin muxing of UART2 also needs to be done, if debug uart
+	 * is not enabled. So we need to call this function here as well.
+	 */
+	board_debug_uart_init();
+
+	return 0;
+}
--- a/configs/bcm968380gerg_ram_defconfig
+++ b/configs/bcm968380gerg_ram_defconfig
@ -39,6 +39,7 @@ CONFIG_SPI_FLASH=y
 # CONFIG_SPI_FLASH_USE_4K_SECTORS is not set
 CONFIG_PHY=y
 CONFIG_BCM6368_USBH_PHY=y
+CONFIG_PINCTRL=y
 CONFIG_POWER_DOMAIN=y
 CONFIG_BCM6328_POWER_DOMAIN=y
 CONFIG_DM_RESET=y
--- a/configs/gardena-smart-gateway-mt7688-ram_defconfig
+++ b/configs/gardena-smart-gateway-mt7688-ram_defconfig
@ -0,0 +1,55 @@
+CONFIG_MIPS=y
+CONFIG_SYS_TEXT_BASE=0x80010000
+CONFIG_ARCH_MT7620=y
+# CONFIG_MIPS_BOOT_CMDLINE_LEGACY is not set
+# CONFIG_MIPS_BOOT_ENV_LEGACY is not set
+CONFIG_MIPS_BOOT_FDT=y
+CONFIG_NR_DRAM_BANKS=1
+# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
+CONFIG_OF_STDOUT_VIA_ALIAS=y
+CONFIG_SYS_CONSOLE_INFO_QUIET=y
+CONFIG_BOARD_EARLY_INIT_F=y
+CONFIG_HUSH_PARSER=y
+CONFIG_CMD_CPU=y
+CONFIG_CMD_LICENSE=y
+# CONFIG_CMD_BOOTD is not set
+# CONFIG_CMD_ELF is not set
+# CONFIG_CMD_XIMG is not set
+CONFIG_CMD_MEMINFO=y
+# CONFIG_CMD_FLASH is not set
+# CONFIG_CMD_LOADS is not set
+CONFIG_CMD_SF=y
+CONFIG_CMD_SPI=y
+# CONFIG_CMD_NET is not set
+CONFIG_CMD_TIME=y
+CONFIG_MTDIDS_DEFAULT="spi-nand0=spi-nand0"
+CONFIG_MTDPARTS_DEFAULT="mtdparts=spi-nand0:-(ubi)"
+CONFIG_CMD_UBI=y
+CONFIG_OF_EMBED=y
+CONFIG_DEFAULT_DEVICE_TREE="gardena-smart-gateway-mt7688"
+CONFIG_ENV_IS_IN_SPI_FLASH=y
+# CONFIG_DM_DEVICE_REMOVE is not set
+CONFIG_HAVE_BLOCK_DEVICE=y
+CONFIG_CLK=y
+CONFIG_CPU=y
+CONFIG_DM_GPIO=y
+CONFIG_LED=y
+CONFIG_LED_BLINK=y
+CONFIG_LED_GPIO=y
+CONFIG_MTD=y
+CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_GIGADEVICE=y
+CONFIG_SPI_FLASH_MACRONIX=y
+CONFIG_SPI_FLASH_SPANSION=y
+CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_SPI_FLASH_WINBOND=y
+CONFIG_SPI_FLASH_MTD=y
+CONFIG_PHY=y
+CONFIG_POWER_DOMAIN=y
+CONFIG_RAM=y
+CONFIG_DM_RESET=y
+CONFIG_BAUDRATE=57600
+# CONFIG_SPL_SERIAL_PRESENT is not set
+CONFIG_SYS_NS16550=y
+CONFIG_SPI=y
+CONFIG_SYSRESET_SYSCON=y
--- a/configs/gardena-smart-gateway-mt7688_defconfig
+++ b/configs/gardena-smart-gateway-mt7688_defconfig
@ -0,0 +1,58 @@
+CONFIG_MIPS=y
+CONFIG_SYS_TEXT_BASE=0x9c000000
+CONFIG_ARCH_MT7620=y
+CONFIG_BOOT_ROM=y
+CONFIG_ONBOARD_DDR2_SIZE_1024MBIT=y
+CONFIG_ONBOARD_DDR2_CHIP_WIDTH_16BIT=y
+# CONFIG_MIPS_BOOT_CMDLINE_LEGACY is not set
+# CONFIG_MIPS_BOOT_ENV_LEGACY is not set
+CONFIG_MIPS_BOOT_FDT=y
+CONFIG_NR_DRAM_BANKS=1
+# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
+CONFIG_OF_STDOUT_VIA_ALIAS=y
+CONFIG_SYS_CONSOLE_INFO_QUIET=y
+CONFIG_BOARD_EARLY_INIT_F=y
+CONFIG_HUSH_PARSER=y
+CONFIG_CMD_CPU=y
+CONFIG_CMD_LICENSE=y
+# CONFIG_CMD_BOOTD is not set
+# CONFIG_CMD_ELF is not set
+# CONFIG_CMD_XIMG is not set
+CONFIG_CMD_MEMINFO=y
+# CONFIG_CMD_FLASH is not set
+# CONFIG_CMD_LOADS is not set
+CONFIG_CMD_SF=y
+CONFIG_CMD_SPI=y
+# CONFIG_CMD_NET is not set
+CONFIG_CMD_TIME=y
+CONFIG_MTDIDS_DEFAULT="spi-nand0=spi-nand0"
+CONFIG_MTDPARTS_DEFAULT="mtdparts=spi-nand0:-(ubi)"
+CONFIG_CMD_UBI=y
+CONFIG_OF_EMBED=y
+CONFIG_DEFAULT_DEVICE_TREE="gardena-smart-gateway-mt7688"
+CONFIG_ENV_IS_IN_SPI_FLASH=y
+# CONFIG_DM_DEVICE_REMOVE is not set
+CONFIG_HAVE_BLOCK_DEVICE=y
+CONFIG_CLK=y
+CONFIG_CPU=y
+CONFIG_DM_GPIO=y
+CONFIG_LED=y
+CONFIG_LED_BLINK=y
+CONFIG_LED_GPIO=y
+CONFIG_MTD=y
+CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_GIGADEVICE=y
+CONFIG_SPI_FLASH_MACRONIX=y
+CONFIG_SPI_FLASH_SPANSION=y
+CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_SPI_FLASH_WINBOND=y
+CONFIG_SPI_FLASH_MTD=y
+CONFIG_PHY=y
+CONFIG_POWER_DOMAIN=y
+CONFIG_RAM=y
+CONFIG_DM_RESET=y
+CONFIG_BAUDRATE=57600
+# CONFIG_SPL_SERIAL_PRESENT is not set
+CONFIG_SYS_NS16550=y
+CONFIG_SPI=y
+CONFIG_SYSRESET_SYSCON=y
--- a/configs/linkit-smart-7688-ram_defconfig
+++ b/configs/linkit-smart-7688-ram_defconfig
@ -0,0 +1,51 @@
+CONFIG_MIPS=y
+CONFIG_SYS_TEXT_BASE=0x80010000
+CONFIG_ARCH_MT7620=y
+# CONFIG_MIPS_BOOT_CMDLINE_LEGACY is not set
+# CONFIG_MIPS_BOOT_ENV_LEGACY is not set
+CONFIG_MIPS_BOOT_FDT=y
+CONFIG_NR_DRAM_BANKS=1
+# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
+CONFIG_OF_STDOUT_VIA_ALIAS=y
+CONFIG_SYS_CONSOLE_INFO_QUIET=y
+CONFIG_BOARD_EARLY_INIT_F=y
+CONFIG_HUSH_PARSER=y
+CONFIG_CMD_CPU=y
+CONFIG_CMD_LICENSE=y
+# CONFIG_CMD_BOOTD is not set
+# CONFIG_CMD_ELF is not set
+# CONFIG_CMD_XIMG is not set
+CONFIG_CMD_MEMINFO=y
+# CONFIG_CMD_FLASH is not set
+# CONFIG_CMD_LOADS is not set
+CONFIG_CMD_SF=y
+CONFIG_CMD_SPI=y
+# CONFIG_CMD_NET is not set
+CONFIG_CMD_TIME=y
+CONFIG_OF_EMBED=y
+CONFIG_DEFAULT_DEVICE_TREE="linkit-smart-7688"
+CONFIG_ENV_IS_IN_SPI_FLASH=y
+# CONFIG_DM_DEVICE_REMOVE is not set
+CONFIG_HAVE_BLOCK_DEVICE=y
+CONFIG_CLK=y
+CONFIG_CPU=y
+CONFIG_DM_GPIO=y
+CONFIG_LED=y
+CONFIG_LED_BLINK=y
+CONFIG_LED_GPIO=y
+CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_GIGADEVICE=y
+CONFIG_SPI_FLASH_MACRONIX=y
+CONFIG_SPI_FLASH_SPANSION=y
+CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_SPI_FLASH_WINBOND=y
+CONFIG_SPI_FLASH_MTD=y
+CONFIG_PHY=y
+CONFIG_POWER_DOMAIN=y
+CONFIG_RAM=y
+CONFIG_DM_RESET=y
+CONFIG_BAUDRATE=57600
+# CONFIG_SPL_SERIAL_PRESENT is not set
+CONFIG_SYS_NS16550=y
+CONFIG_SPI=y
+CONFIG_SYSRESET_SYSCON=y
--- a/configs/linkit-smart-7688_defconfig
+++ b/configs/linkit-smart-7688_defconfig
@ -0,0 +1,55 @@
+CONFIG_MIPS=y
+CONFIG_SYS_TEXT_BASE=0x9c000000
+CONFIG_ARCH_MT7620=y
+CONFIG_BOOT_ROM=y
+CONFIG_ONBOARD_DDR2_SIZE_1024MBIT=y
+CONFIG_ONBOARD_DDR2_CHIP_WIDTH_16BIT=y
+# CONFIG_MIPS_BOOT_CMDLINE_LEGACY is not set
+# CONFIG_MIPS_BOOT_ENV_LEGACY is not set
+CONFIG_MIPS_BOOT_FDT=y
+CONFIG_NR_DRAM_BANKS=1
+# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
+CONFIG_OF_STDOUT_VIA_ALIAS=y
+CONFIG_SYS_CONSOLE_INFO_QUIET=y
+CONFIG_BOARD_EARLY_INIT_F=y
+CONFIG_HUSH_PARSER=y
+CONFIG_CMD_CPU=y
+CONFIG_CMD_LICENSE=y
+# CONFIG_CMD_BOOTD is not set
+# CONFIG_CMD_ELF is not set
+# CONFIG_CMD_XIMG is not set
+# CONFIG_CMD_CRC32 is not set
+CONFIG_CMD_MEMINFO=y
+# CONFIG_CMD_FLASH is not set
+# CONFIG_CMD_LOADS is not set
+CONFIG_CMD_SF=y
+CONFIG_CMD_SPI=y
+# CONFIG_CMD_NET is not set
+CONFIG_CMD_TIME=y
+CONFIG_OF_EMBED=y
+CONFIG_DEFAULT_DEVICE_TREE="linkit-smart-7688"
+CONFIG_ENV_IS_IN_SPI_FLASH=y
+# CONFIG_DM_DEVICE_REMOVE is not set
+CONFIG_HAVE_BLOCK_DEVICE=y
+CONFIG_CLK=y
+CONFIG_CPU=y
+CONFIG_DM_GPIO=y
+CONFIG_LED=y
+CONFIG_LED_BLINK=y
+CONFIG_LED_GPIO=y
+CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_GIGADEVICE=y
+CONFIG_SPI_FLASH_MACRONIX=y
+CONFIG_SPI_FLASH_SPANSION=y
+CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_SPI_FLASH_WINBOND=y
+CONFIG_SPI_FLASH_MTD=y
+CONFIG_PHY=y
+CONFIG_POWER_DOMAIN=y
+CONFIG_RAM=y
+CONFIG_DM_RESET=y
+CONFIG_BAUDRATE=57600
+# CONFIG_SPL_SERIAL_PRESENT is not set
+CONFIG_SYS_NS16550=y
+CONFIG_SPI=y
+CONFIG_SYSRESET_SYSCON=y
--- a/doc/device-tree-bindings/pinctrl/bcm6838-pinctrl.txt
+++ b/doc/device-tree-bindings/pinctrl/bcm6838-pinctrl.txt
@ -0,0 +1,35 @@
+* broadcom bcm6838 pinctrl
+
+Required properties for the pinctrl driver:
+- compatible:	   "brcm,bcm6838-pinctrl"
+- regmap: 		   specify the gpio test port syscon
+- brcm,pins-count:      the number of pin
+- brcm,functions-count: the number of function
+
+Please refer to pinctrl-bindings.txt in this directory for details of the
+common pinctrl bindings used by client devices.
+
+Example:
+
+		gpio_test_port: syscon@14e00294 {
+			compatible = "syscon";
+			reg = <0x14e00294 0x1c>;
+		};
+
+		pinctrl: pinctrl {
+			compatible = "brcm,bcm6838-pinctrl";
+			regmap = <&gpio_test_port>;
+			brcm,pins-count = <74>;
+			brcm,functions-count = <8>;
+
+			usb0: usb0 {
+				usb0_pwrflt {
+					pins = "69";
+					function = "1";
+				};
+				usb0_pwron {
+					pins = "70";
+					function = "1";
+				};
+			};
+		};
--- a/drivers/pinctrl/broadcom/Kconfig
+++ b/drivers/pinctrl/broadcom/Kconfig
@ -5,3 +5,11 @@ config PINCTRL_BCM283X
 	help
 	   Support pin multiplexing and pin configuration control on
 	   Broadcom's 283x family of SoCs.
+
+config PINCTRL_BCM6838
+	depends on ARCH_BMIPS && PINCTRL_FULL && OF_CONTROL
+	default y
+	bool "Broadcom 6838 family pin control driver"
+	help
+	   Support pin multiplexing and pin configuration control on
+	   Broadcom's 6838 family of SoCs.
--- a/drivers/pinctrl/broadcom/Makefile
+++ b/drivers/pinctrl/broadcom/Makefile
@ -5,3 +5,4 @@
 # https://spdx.org/licenses

 obj-$(CONFIG_PINCTRL_BCM283X) += pinctrl-bcm283x.o
+obj-$(CONFIG_PINCTRL_BCM6838) += pinctrl-bcm6838.o
--- a/drivers/pinctrl/broadcom/pinctrl-bcm6838.c
+++ b/drivers/pinctrl/broadcom/pinctrl-bcm6838.c
@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <common.h>
+#include <dm.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <dm/pinctrl.h>
+
+#define BCM6838_CMD_LOAD_MUX            0x21
+
+#define BCM6838_FUNC_OFFS               12
+#define BCM6838_FUNC_MASK               (0x37 << BCM6838_FUNC_OFFS)
+#define BCM6838_PIN_OFFS                 0
+#define BCM6838_PIN_MASK                (0xfff << BCM6838_PIN_OFFS)
+
+#define BCM6838_MAX_PIN_NAME_LEN         8
+static char bcm6838_pin_name[BCM6838_MAX_PIN_NAME_LEN];
+
+#define BCM6838_MAX_FUNC_NAME_LEN        8
+static char bcm6838_func_name[BCM6838_MAX_FUNC_NAME_LEN];
+
+struct bcm6838_test_port_hw {
+	unsigned long port_blk_data1;
+	unsigned long port_blk_data2;
+	unsigned long port_command;
+};
+
+static const struct bcm6838_test_port_hw bcm6838_hw = {
+	.port_blk_data1 = 0x10,
+	.port_blk_data2 = 0x14,
+	.port_command   = 0x18
+};
+
+struct bcm6838_pinctrl_priv {
+	const struct bcm6838_test_port_hw *hw;
+	struct regmap *regmap;
+	u32 pins_count;
+	u32 functions_count;
+};
+
+int bcm6838_pinctrl_get_pins_count(struct udevice *dev)
+{
+	struct bcm6838_pinctrl_priv *priv = dev_get_priv(dev);
+
+	return priv->pins_count;
+}
+
+const char *bcm6838_pinctrl_get_pin_name(struct udevice *dev,
+					 unsigned int selector)
+{
+	snprintf(bcm6838_pin_name, BCM6838_MAX_PIN_NAME_LEN, "%u", selector);
+	return bcm6838_pin_name;
+}
+
+int bcm6838_pinctrl_get_functions_count(struct udevice *dev)
+{
+	struct bcm6838_pinctrl_priv *priv = dev_get_priv(dev);
+
+	return priv->functions_count;
+}
+
+const char *bcm6838_pinctrl_get_function_name(struct udevice *dev,
+					      unsigned int selector)
+{
+	snprintf(bcm6838_func_name, BCM6838_MAX_FUNC_NAME_LEN, "%u", selector);
+	return bcm6838_func_name;
+}
+
+int bcm6838_pinctrl_pinmux_set(struct udevice *dev,
+			       unsigned int pin_selector,
+			       unsigned int func_selector)
+{
+	struct bcm6838_pinctrl_priv *priv = dev_get_priv(dev);
+	const struct bcm6838_test_port_hw *hw = priv->hw;
+	unsigned int data;
+
+	regmap_write(priv->regmap, hw->port_blk_data1, 0);
+	data = (func_selector << BCM6838_FUNC_OFFS) & BCM6838_FUNC_MASK;
+	data |= (pin_selector << BCM6838_PIN_OFFS) & BCM6838_PIN_MASK;
+	regmap_write(priv->regmap, hw->port_blk_data2, data);
+	regmap_write(priv->regmap, hw->port_command, BCM6838_CMD_LOAD_MUX);
+
+	return 0;
+}
+
+int bcm6838_pinctrl_probe(struct udevice *dev)
+{
+	struct bcm6838_pinctrl_priv *priv = dev_get_priv(dev);
+	const struct bcm6838_test_port_hw *hw =
+		(const struct bcm6838_test_port_hw *)dev_get_driver_data(dev);
+	int err;
+	u32 phandle;
+	ofnode node;
+
+	err = ofnode_read_u32(dev_ofnode(dev), "regmap", &phandle);
+	if (err) {
+		dev_err(dev, "%s: unable to read regmap\n", __func__);
+		goto out;
+	}
+
+	node = ofnode_get_by_phandle(phandle);
+	if (!ofnode_valid(node)) {
+		dev_err(dev, "%s: unable to find node\n", __func__);
+		err = -EINVAL;
+		goto out;
+	}
+
+	priv->regmap = syscon_node_to_regmap(node);
+	if (!priv->regmap) {
+		dev_err(dev, "%s: unable to find regmap\n", __func__);
+		err = -ENODEV;
+		goto out;
+	}
+
+	err = ofnode_read_u32(dev_ofnode(dev), "brcm,pins-count",
+			      &priv->pins_count);
+	if (err) {
+		dev_err(dev, "%s: unable to read brcm,pins-count\n",
+			__func__);
+		goto out;
+	}
+
+	err = ofnode_read_u32(dev_ofnode(dev), "brcm,functions-count",
+			      &priv->functions_count);
+	if (err) {
+		dev_err(dev, "%s: unable to read brcm,functions-count\n",
+			__func__);
+		goto out;
+	}
+
+	priv->hw = hw;
+
+ out:
+	return err;
+}
+
+const struct pinctrl_ops bcm6838_pinctrl_ops = {
+	.set_state = pinctrl_generic_set_state,
+	.get_pins_count = bcm6838_pinctrl_get_pins_count,
+	.get_pin_name = bcm6838_pinctrl_get_pin_name,
+	.get_functions_count = bcm6838_pinctrl_get_functions_count,
+	.get_function_name = bcm6838_pinctrl_get_function_name,
+	.pinmux_set = bcm6838_pinctrl_pinmux_set,
+};
+
+static const struct udevice_id bcm6838_pinctrl_match[] = {
+	{
+		.compatible = "brcm,bcm6838-pinctrl",
+		.data = (ulong)&bcm6838_hw,
+	},
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(bcm6838_pinctrl) = {
+	.name = "bcm6838_pinctrl",
+	.id = UCLASS_PINCTRL,
+	.of_match = bcm6838_pinctrl_match,
+	.ops = &bcm6838_pinctrl_ops,
+	.priv_auto_alloc_size = sizeof(struct bcm6838_pinctrl_priv),
+	.probe = bcm6838_pinctrl_probe,
+};
--- a/include/configs/gardena-smart-gateway-mt7688.h
+++ b/include/configs/gardena-smart-gateway-mt7688.h
@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 Stefan Roese <sr@denx.de>
+ */
+
+#ifndef __CONFIG_GARDENA_SMART_GATEWAY_H
+#define __CONFIG_GARDENA_SMART_GATEWAY_H
+
+/* CPU */
+#define CONFIG_SYS_MIPS_TIMER_FREQ	200000000
+
+/* RAM */
+#define CONFIG_SYS_SDRAM_BASE		0x80000000
+
+#define CONFIG_SYS_LOAD_ADDR		CONFIG_SYS_SDRAM_BASE + 0x100000
+
+#define CONFIG_SYS_INIT_SP_OFFSET	0x400000
+
+#ifdef CONFIG_BOOT_RAM
+#define CONFIG_SKIP_LOWLEVEL_INIT
+#endif
+
+/* UART */
+#define CONFIG_SYS_BAUDRATE_TABLE	{ 9600, 19200, 38400, 57600, 115200, \
+					  230400, 500000, 1500000 }
+
+/* RAM */
+#define CONFIG_SYS_MEMTEST_START	0x80100000
+#define CONFIG_SYS_MEMTEST_END		0x80400000
+
+/* Memory usage */
+#define CONFIG_SYS_MAXARGS		64
+#define CONFIG_SYS_MALLOC_LEN		(1024 * 1024)
+#define CONFIG_SYS_BOOTPARAMS_LEN	(128 * 1024)
+#define CONFIG_SYS_CBSIZE		512
+
+/* U-Boot */
+#define CONFIG_SYS_MONITOR_BASE		CONFIG_SYS_TEXT_BASE
+
+/* Environment settings */
+#define CONFIG_ENV_OFFSET		0x80000
+#define CONFIG_ENV_SIZE			(64 << 10)
+#define CONFIG_ENV_SECT_SIZE		(64 << 10)
+#define CONFIG_SYS_REDUNDAND_ENVIRONMENT
+#define CONFIG_ENV_OFFSET_REDUND	(CONFIG_ENV_OFFSET + \
+						CONFIG_ENV_SECT_SIZE)
+#define CONFIG_ENV_SIZE_REDUND		CONFIG_ENV_SIZE
+
+/*
+ * Environment is right behind U-Boot in flash. Make sure U-Boot
+ * doesn't grow into the environment area.
+ */
+#define CONFIG_BOARD_SIZE_LIMIT		CONFIG_ENV_OFFSET
+
+#endif /* __CONFIG_GARDENA_SMART_GATEWAY_H */
--- a/include/configs/imgtec_xilfpga.h
+++ b/include/configs/imgtec_xilfpga.h
@ -19,9 +19,6 @@
 /* CPU Timer rate */
 #define CONFIG_SYS_MIPS_TIMER_FREQ	50000000

-/* Cache Configuration */
-#define CONFIG_SYS_MIPS_CACHE_MODE	CONF_CM_CACHABLE_NONCOHERENT
-
 /*----------------------------------------------------------------------
 * Memory Layout
 */
--- a/include/configs/linkit-smart-7688.h
+++ b/include/configs/linkit-smart-7688.h
@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 Stefan Roese <sr@denx.de>
+ */
+
+#ifndef __CONFIG_LINKIT_SMART_7688_H
+#define __CONFIG_LINKIT_SMART_7688_H
+
+/* CPU */
+#define CONFIG_SYS_MIPS_TIMER_FREQ	200000000
+
+/* RAM */
+#define CONFIG_SYS_SDRAM_BASE		0x80000000
+
+#define CONFIG_SYS_LOAD_ADDR		CONFIG_SYS_SDRAM_BASE + 0x100000
+
+#define CONFIG_SYS_INIT_SP_OFFSET	0x400000
+
+#ifdef CONFIG_BOOT_RAM
+#define CONFIG_SKIP_LOWLEVEL_INIT
+#endif
+
+/* UART */
+#define CONFIG_SYS_BAUDRATE_TABLE	{ 9600, 19200, 38400, 57600, 115200, \
+					  230400, 500000, 1500000 }
+
+/* RAM */
+#define CONFIG_SYS_MEMTEST_START	0x80100000
+#define CONFIG_SYS_MEMTEST_END		0x80400000
+
+/* Memory usage */
+#define CONFIG_SYS_MAXARGS		64
+#define CONFIG_SYS_MALLOC_LEN		(1024 * 1024)
+#define CONFIG_SYS_BOOTPARAMS_LEN	(128 * 1024)
+#define CONFIG_SYS_CBSIZE		512
+
+/* U-Boot */
+#define CONFIG_SYS_MONITOR_BASE		CONFIG_SYS_TEXT_BASE
+
+/* Environment settings */
+#define CONFIG_ENV_OFFSET		0x40000
+#define CONFIG_ENV_SIZE			(16 << 10)
+#define CONFIG_ENV_SECT_SIZE		(64 << 10)
+
+/*
+ * Environment is right behind U-Boot in flash. Make sure U-Boot
+ * doesn't grow into the environment area.
+ */
+#define CONFIG_BOARD_SIZE_LIMIT		CONFIG_ENV_OFFSET
+
+#endif /* __CONFIG_LINKIT_SMART_7688_H */
--- a/include/configs/pic32mzdask.h
+++ b/include/configs/pic32mzdask.h
@ -16,9 +16,6 @@
 /* CPU Timer rate */
 #define CONFIG_SYS_MIPS_TIMER_FREQ	100000000

-/* Cache Configuration */
-#define CONFIG_SYS_MIPS_CACHE_MODE	CONF_CM_CACHABLE_NONCOHERENT
-
 /*----------------------------------------------------------------------
 * Memory Layout
 */
--- a/scripts/config_whitelist.txt
+++ b/scripts/config_whitelist.txt
@ -3424,7 +3424,6 @@ CONFIG_SYS_MEM_TOP_HIDE
 CONFIG_SYS_MFD
 CONFIG_SYS_MHZ
 CONFIG_SYS_MII_MODE
-CONFIG_SYS_MIPS_CACHE_MODE
 CONFIG_SYS_MIPS_TIMER_FREQ
 CONFIG_SYS_MMCSD_FS_BOOT_PARTITION
 CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR
@ -4421,7 +4420,6 @@ CONFIG_SYS_XHCI_USB1_ADDR
 CONFIG_SYS_XHCI_USB2_ADDR
 CONFIG_SYS_XHCI_USB3_ADDR
 CONFIG_SYS_XIMG_LEN
-CONFIG_SYS_XWAY_EBU_BOOTCFG
 CONFIG_SYS_ZYNQ_QSPI_WAIT
 CONFIG_SYS_ZYNQ_SPI_WAIT
 CONFIG_SYS_i2C_FSL