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arm: mvebu: x240: Use i2c-gpio instead of built in controller

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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>
This commit is contained in:
Chris Packham 2023-07-26 11:13:09 +12:00 committed by Stefan Roese
parent 414236b887
commit 5c1c6b7306
2 changed files with 24 additions and 7 deletions
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30
arch/arm/dts/ac5-98dx35xx-atl-x240.dts
View file

@ -16,7 +16,7 @@
gpio0 = &gpio0;
gpio1 = &gpio1;
spi0 = &spi0;
i2c0 = &i2c0;
i2c0 = &i2cgpio;
usb0 = &usb0;
pinctrl0 = &pinctrl0;
};
@ -40,6 +40,19 @@
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 {
@ -70,9 +83,7 @@
status = "okay";
};
&i2c0 {
status = "okay";
&i2cgpio {
mux@71 {
#address-cells = <1>;
#size-cells = <0>;
@ -177,8 +188,8 @@
* LED_OE_N [23]
* USB_PWR_FLT_N [24]
* SFP_INT_N [25]
* I2C0_SCL [26]
* I2C0_SDA [27]
* I2C0_SCL [26] (GPIO)
* I2C0_SDA [27] (GPIO)
* USB_EN [28]
* MONITOR_INT_N [29]
* XM1_MDC [30]
@ -201,7 +212,7 @@
/* 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 1 1 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 >;
@ -209,4 +220,9 @@
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>;
};
};

1
configs/x240_defconfig
View file

@ -42,6 +42,7 @@ CONFIG_CLK_MVEBU=y
CONFIG_GPIO_HOG=y
CONFIG_DM_PCA953X=y
CONFIG_DM_I2C=y
CONFIG_DM_I2C_GPIO=y
CONFIG_SYS_I2C_MVTWSI=y
CONFIG_I2C_MUX=y
CONFIG_I2C_MUX_PCA954x=y