diff options
| author | Chris Packham <judge.packham@gmail.com> | 2023-07-26 02:13:09 +0300 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2023-07-31 14:50:57 +0300 |
| commit | 5c1c6b7306f2b4c0fd50c7cb5d757e245b93606e (patch) | |
| tree | 6c5b5f5f7c8ac3151117d19d0c002f78c4399a82 /arch | |
| parent | 414236b887a2270d714edf3654eaa0def6315ec6 (diff) | |
| download | u-boot-5c1c6b7306f2b4c0fd50c7cb5d757e245b93606e.tar.xz | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/dts/ac5-98dx35xx-atl-x240.dts | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/arch/arm/dts/ac5-98dx35xx-atl-x240.dts b/arch/arm/dts/ac5-98dx35xx-atl-x240.dts index 820ec18b43..c19b25925b 100644 --- a/arch/arm/dts/ac5-98dx35xx-atl-x240.dts +++ b/arch/arm/dts/ac5-98dx35xx-atl-x240.dts @@ -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>; + }; }; |