Message ID | 20230725231322.1375303-2-judge.packham@gmail.com |
---|---|
State | Accepted |
Commit | 5c1c6b7306f2b4c0fd50c7cb5d757e245b93606e |
Delegated to: | Stefan Roese |
Headers | show |
Series | [v2,1/2] i2c: i2c-gpio: Correctly handle new {sda, scl}-gpios bindings | expand |
On 7/26/23 01:13, Chris Packham wrote: > 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> Applied to u-boot-marvell/master Thanks, Stefan > --- > > Changes in v2: > - Update i2c0 alias > - Move i2c-gpio definition to root of device tree > - Remove &i2c0 instead of just disabling it > - Add r-by from Stefan > > arch/arm/dts/ac5-98dx35xx-atl-x240.dts | 30 ++++++++++++++++++++------ > configs/x240_defconfig | 1 + > 2 files changed, 24 insertions(+), 7 deletions(-) > > diff --git a/arch/arm/dts/ac5-98dx35xx-atl-x240.dts b/arch/arm/dts/ac5-98dx35xx-atl-x240.dts > index 820ec18b4355..c19b25925ba2 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>; > + }; > }; > diff --git a/configs/x240_defconfig b/configs/x240_defconfig > index a78cb3ce6cbf..7d2b8603e6f4 100644 > --- a/configs/x240_defconfig > +++ b/configs/x240_defconfig > @@ -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 Viele Grüße, Stefan Roese
diff --git a/arch/arm/dts/ac5-98dx35xx-atl-x240.dts b/arch/arm/dts/ac5-98dx35xx-atl-x240.dts index 820ec18b4355..c19b25925ba2 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>; + }; }; diff --git a/configs/x240_defconfig b/configs/x240_defconfig index a78cb3ce6cbf..7d2b8603e6f4 100644 --- a/configs/x240_defconfig +++ b/configs/x240_defconfig @@ -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