u-boot/arch/arm/dts/ac5-98dx35xx-atl-x240.dts
Chris Packham 5c1c6b7306 arm: mvebu: x240: Use i2c-gpio instead of built in controller
There is an Errata with the built-in I2C controller where various I2C
hardware errors cause a complete lockup of the CPU (which eventually
results in an watchdog reset).

Put the I2C MPP pins into GPIO mode and use the i2c-gpio driver instead.
This uses a bit-banged implementation of an I2C controller and avoids
triggering the Errata.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
2023-07-31 13:50:57 +02:00

228 lines
4.6 KiB
Text

// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/dts-v1/;
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
#include "ac5-98dx35xx.dtsi"
/ {
model = "Allied Telesis x240";
compatible = "alliedtelesis,x240", "marvell,ac5x", "marvell,ac5";
aliases {
serial0 = &uart0;
spiflash0 = &spiflash0;
gpio0 = &gpio0;
gpio1 = &gpio1;
spi0 = &spi0;
i2c0 = &i2cgpio;
usb0 = &usb0;
pinctrl0 = &pinctrl0;
};
chosen {
stdout-path = "serial0:115200n8";
};
boot-board {
compatible = "atl,boot-board";
present-gpio = <&gpio1 6 GPIO_ACTIVE_HIGH>;
override-gpio = <&gpio1 2 GPIO_ACTIVE_HIGH>;
};
gpio-leds {
compatible = "gpio-leds";
fault {
label = "fault:red";
gpios = <&system_gpio 11 GPIO_ACTIVE_LOW>;
default-state = "on";
};
};
i2cgpio: i2c-gpio-0 {
compatible = "i2c-gpio";
#address-cells = <1>;
#size-cells = <0>;
pinctrl-names = "default";
pinctrl-0 = <&i2c0_gpio>;
scl-gpios = <&gpio0 26 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
sda-gpios = <&gpio0 27 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
i2c-gpio,delay-us = <2>;
status = "okay";
};
};
&nand {
pinctrl-names = "default";
pinctrl-0 = <&nand_pins>;
nand-ecc-strength = <4>;
nand-ecc-step-size = <512>;
status = "okay";
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;
partition@user {
reg = <0x00000000 0x10000000>;
label = "user";
};
};
};
&uart0 {
status = "okay";
};
&usb0 {
status = "okay";
};
&i2cgpio {
mux@71 {
#address-cells = <1>;
#size-cells = <0>;
compatible = "nxp,pca9546";
reg = <0x71>;
i2c-mux-idle-disconnect;
reset-gpios = <&gpio1 4 GPIO_ACTIVE_LOW>; /* MPP36 */
status = "okay";
i2c@1 {
#address-cells = <1>;
#size-cells = <0>;
reg = <1>;
hwmon@2e {
compatible = "adi,adt7476";
reg = <0x2e>;
};
rtc@68 {
compatible = "adi,max31331";
reg = <0x68>;
};
system_gpio: gpio@27 {
compatible = "nxp,pca9555";
gpio-controller;
#gpio-cells= <2>;
reg = <0x27>;
interrupt-parent = <&gpio0>;
interrupts = <25 IRQ_TYPE_LEVEL_LOW>; /* MPP25 */
};
};
};
};
&spi0 {
status = "okay";
spiflash0: flash@0 {
compatible = "jedec,spi-nor";
spi-max-frequency = <50000000>;
spi-tx-bus-width = <1>; /* 1-single, 2-dual, 4-quad */
spi-rx-bus-width = <1>; /* 1-single, 2-dual, 4-quad */
reg = <0>;
#address-cells = <1>;
#size-cells = <1>;
};
};
&gpio0 {
phy-reset {
gpio-hog;
gpios = <19 GPIO_ACTIVE_LOW>;
output-high;
line-name = "phy-reset";
};
usb-en {
gpio-hog;
gpios = <28 GPIO_ACTIVE_HIGH>;
output-high;
line-name = "usb-en";
};
led-oe-n {
gpio-hog;
gpios = <23 GPIO_ACTIVE_LOW>;
output-low;
line-name = "led-oe-n";
};
};
&gpio1 {
nand-protect {
gpio-hog;
gpios = <8 GPIO_ACTIVE_LOW>;
output-low;
line-name = "nand-protect";
};
};
&pinctrl0 {
/*
* MPP Bus: MPP#
* NF_IO [0-7]
* NF_Wen [8]
* NF_ALE [9]
* NF_CLE [10]
* NF_Cen [11]
* QSPI_SCK/SPI0_SCK [12]
* QSPI_CSn/SPI0_CSn [13]
* QSPI_DIO[0]/SPI0_MOSI [14]
* QSPI_DIO[1]/SPI0_MISO [15]
* NF_Ren [16]
* NF_RBn [17]
* WD_INTn [18]
* B_B_OVRIDE_N [19]
* GREEN_SW_N [20]
* PHY_INT_N[0] [21]
* SPI_WPn [22]
* LED_OE_N [23]
* USB_PWR_FLT_N [24]
* SFP_INT_N [25]
* I2C0_SCL [26] (GPIO)
* I2C0_SDA [27] (GPIO)
* USB_EN [28]
* MONITOR_INT_N [29]
* XM1_MDC [30]
* XM1_MDIO [31]
* UA0_RXD [32]
* UA0_TXD [33]
* PHY_RST0n [34]
* TPM_INT_N [35]
* I2CMUX_RESET_N [36]
* SPI_SRAM_SEL_N [37]
* B_B_PRESENT [38]
* SPI_FLASH_SEL_N [39]
* NF_WP_N [40]
* POE_INT_N [41]
* PoE_RST_N [42]
* LED0_CLK [43]
* LED0_STB [44]
* LED0_DATA [45]
*/
/* 0 1 2 3 4 5 6 7 8 9 */
pin-func = < 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
0xff 0xff 1 1 1 1 0xff 0xff 0 0
0 0 0 0 0 0 0xff 0xff 0 0
1 1 1 1 0 0 0 0 0 0
0 0 0 1 1 1 >;
nand_pins: nand-pins {
marvell,pins = <0 1 2 3 4 5 6 7 8 9 10 11 16 17>;
marvell,function = <2>;
};
i2c0_gpio: i2c0-gpio-pins {
marvell,pins = <26 27>;
marvell,function = <0>;
};
};