clk: sunxi: Add Allwinner A10/A20 CLK driver

Add initial clock driver for Allwinner A10/A20.

- Implement USB ahb and USB clocks via ccu_clk_gate table
  for A10/A20, so it can accessed in common clk enable and
  disable functions from clk_sunxi.c
- Implement USB resets via ccu_reset table for A10/A20,
  so it can accessed in common reset deassert and assert
  functions from reset-sunxi.c

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>

drivers/clk/sunxi/Kconfig

@@ -9,6 +9,13 @@ config CLK_SUNXI
 
 if CLK_SUNXI
 
+config CLK_SUN4I_A10
+	bool "Clock driver for Allwinner A10/A20"
+	default MACH_SUN4I || MACH_SUN7I
+	help
+	  This enables common clock driver support for platforms based
+	  on Allwinner A10/A20 SoC.
+
 config CLK_SUN8I_H3
 	bool "Clock driver for Allwinner H3/H5"
 	default MACH_SUNXI_H3_H5

drivers/clk/sunxi/Makefile

@@ -6,5 +6,6 @@
 
 obj-$(CONFIG_CLK_SUNXI) += clk_sunxi.o
 
+obj-$(CONFIG_CLK_SUN4I_A10) += clk_a10.o
 obj-$(CONFIG_CLK_SUN8I_H3) += clk_h3.o
 obj-$(CONFIG_CLK_SUN50I_A64) += clk_a64.o

drivers/clk/sunxi/clk_a10.c

@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (C) 2018 Amarula Solutions.
+ * Author: Jagan Teki <jagan@amarulasolutions.com>
+ */
+
+#include <common.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <errno.h>
+#include <asm/arch/ccu.h>
+#include <dt-bindings/clock/sun4i-a10-ccu.h>
+#include <dt-bindings/reset/sun4i-a10-ccu.h>
+
+static struct ccu_clk_gate a10_gates[] = {
+	[CLK_AHB_OTG]		= GATE(0x060, BIT(0)),
+	[CLK_AHB_EHCI0]		= GATE(0x060, BIT(1)),
+	[CLK_AHB_OHCI0]		= GATE(0x060, BIT(2)),
+	[CLK_AHB_EHCI1]		= GATE(0x060, BIT(3)),
+	[CLK_AHB_OHCI1]		= GATE(0x060, BIT(4)),
+
+	[CLK_USB_OHCI0]		= GATE(0x0cc, BIT(6)),
+	[CLK_USB_OHCI1]		= GATE(0x0cc, BIT(7)),
+	[CLK_USB_PHY]		= GATE(0x0cc, BIT(8)),
+};
+
+static struct ccu_reset a10_resets[] = {
+	[RST_USB_PHY0]		= RESET(0x0cc, BIT(0)),
+	[RST_USB_PHY1]		= RESET(0x0cc, BIT(1)),
+	[RST_USB_PHY2]		= RESET(0x0cc, BIT(2)),
+};
+
+static const struct ccu_desc a10_ccu_desc = {
+	.gates = a10_gates,
+	.resets = a10_resets,
+};
+
+static int a10_clk_bind(struct udevice *dev)
+{
+	return sunxi_reset_bind(dev, ARRAY_SIZE(a10_resets));
+}
+
+static const struct udevice_id a10_ccu_ids[] = {
+	{ .compatible = "allwinner,sun4i-a10-ccu",
+	  .data = (ulong)&a10_ccu_desc },
+	{ .compatible = "allwinner,sun7i-a20-ccu",
+	  .data = (ulong)&a10_ccu_desc },
+	{ }
+};
+
+U_BOOT_DRIVER(clk_sun4i_a10) = {
+	.name		= "sun4i_a10_ccu",
+	.id		= UCLASS_CLK,
+	.of_match	= a10_ccu_ids,
+	.priv_auto_alloc_size	= sizeof(struct ccu_priv),
+	.ops		= &sunxi_clk_ops,
+	.probe		= sunxi_clk_probe,
+	.bind		= a10_clk_bind,
+};