linux-kernel - Re: [PATCH] ARM: dts: at91-sama5d2_icp.dts: Added I2C bus recovery support

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Date:   Tue, 21 Sep 2021 11:17:27 +0200
From:   Nicolas Ferre <nicolas.ferre@...rochip.com>
To:     Durai Manickam KR <durai.manickamkr@...rochip.com>,
        <robh+dt@...nel.org>, <alexandre.belloni@...tlin.com>,
        <ludovic.desroches@...rochip.com>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <Hari.PrasathGE@...rochip.com>
Subject: Re: [PATCH] ARM: dts: at91-sama5d2_icp.dts: Added I2C bus recovery
 support

On 21/09/2021 at 08:43, Durai Manickam KR wrote:
> SDA and SCL is configured as GPIO for I2C bus to recover during
> I2C bus malfunction.
> 
> Signed-off-by: Durai Manickam KR <durai.manickamkr@...rochip.com>

Acked-by: Nicolas Ferre <nicolas.ferre@...rochip.com>
And queued on at91-dt for 5.16.

Thanks, best regards,
   Nicolas

> ---
>   arch/arm/boot/dts/at91-sama5d2_icp.dts | 22 ++++++++++++++++++++--
>   1 file changed, 20 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/at91-sama5d2_icp.dts b/arch/arm/boot/dts/at91-sama5d2_icp.dts
> index e06b58724ca8..806eb1d911d7 100644
> --- a/arch/arm/boot/dts/at91-sama5d2_icp.dts
> +++ b/arch/arm/boot/dts/at91-sama5d2_icp.dts
> @@ -307,8 +307,11 @@ regulator-state-mem {
>   };
>   
>   &i2c0 { /* mikrobus i2c */
> -	pinctrl-names = "default";
> +	pinctrl-names = "default", "gpio";
>   	pinctrl-0 = <&pinctrl_mikrobus_i2c>;
> +	pinctrl-1 = <&pinctrl_i2c0_gpio>;
> +	sda-gpios = <&pioA PIN_PD21 GPIO_ACTIVE_HIGH>;
> +	scl-gpios = <&pioA PIN_PD22 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
>   	i2c-digital-filter;
>   	i2c-digital-filter-width-ns = <35>;
>   	status = "okay";
> @@ -316,8 +319,11 @@ &i2c0 { /* mikrobus i2c */
>   
>   &i2c1 {
>   	dmas = <0>, <0>;
> -	pinctrl-names = "default";
> +	pinctrl-names = "default", "gpio";
>   	pinctrl-0 = <&pinctrl_i2c1_default>;
> +	pinctrl-1 = <&pinctrl_i2c1_gpio>;
> +	sda-gpios = <&pioA PIN_PD19 GPIO_ACTIVE_HIGH>;
> +	scl-gpios = <&pioA PIN_PD20 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
>   	i2c-digital-filter;
>   	i2c-digital-filter-width-ns = <35>;
>   	status = "okay";
> @@ -402,6 +408,12 @@ pinctrl_i2c1_default: i2c1_default {
>   		bias-disable;
>   	};
>   
> +	pinctrl_i2c1_gpio: i2c1_gpio {
> +                pinmux = <PIN_PD19__GPIO>,
> +                         <PIN_PD20__GPIO>;
> +                bias-disable;
> +        };
> +
>   	pinctrl_key_gpio_default: key_gpio_default {
>   		pinmux = <PIN_PD0__GPIO>;
>   		bias-pull-up;
> @@ -463,6 +475,12 @@ pinctrl_mikrobus_i2c: mikrobus_i2c {
>   		bias-disable;
>   	};
>   
> +	pinctrl_i2c0_gpio: i2c0_gpio {
> +		pinmux = <PIN_PD21__GPIO>,
> +			 <PIN_PD22__GPIO>;
> +		bias-disable;
> +	};
> +
>   	pinctrl_mikrobus1_an: mikrobus1_an {
>   		pinmux = <PIN_PD26__GPIO>;
>   		bias-disable;
> 


-- 
Nicolas Ferre