linux-kernel - Re: [RFT] ARM: dts: exynos: Remove double SD card detect pin inversion

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Message-Id: <20180906092151eucas1p1c7e7e187120468f0e99afce3dd2859b6~RxSVGQkCD1671916719eucas1p1C@eucas1p1.samsung.com>
Date:   Thu, 6 Sep 2018 11:21:51 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Maciej Purski <m.purski@...sung.com>,
        Simon Shields <simon@...eageos.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFT] ARM: dts: exynos: Remove double SD card detect pin
 inversion

Hi Krzysztof,

On 2018-09-05 19:40, Krzysztof Kozlowski wrote:
> The SDHCI standard, MMC host controller bindings and MMC core defines
> card detect pin as active low.  Therefore there is no point to invert it
> twice.
>
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
>
> ---
>
> Tested only on Odroid U3. Tests on other platforms would be appreciated.

SD card detection still works fine on UniversalC210, Trats2 and OdroidU3 
with this patch.

Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>

> ---
>   arch/arm/boot/dts/exynos4210-universal_c210.dts | 3 +--
>   arch/arm/boot/dts/exynos4412-midas.dtsi         | 3 +--
>   arch/arm/boot/dts/exynos4412-odroid-common.dtsi | 3 +--
>   3 files changed, 3 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/boot/dts/exynos4210-universal_c210.dts b/arch/arm/boot/dts/exynos4210-universal_c210.dts
> index 4e6ff97e1ec4..249bfbff1e20 100644
> --- a/arch/arm/boot/dts/exynos4210-universal_c210.dts
> +++ b/arch/arm/boot/dts/exynos4210-universal_c210.dts
> @@ -537,8 +537,7 @@
>   	pinctrl-0 = <&sd2_clk &sd2_cmd &sd2_bus4>;
>   	pinctrl-names = "default";
>   	vmmc-supply = <&ldo5_reg>;
> -	cd-gpios = <&gpx3 4 GPIO_ACTIVE_HIGH>;
> -	cd-inverted;
> +	cd-gpios = <&gpx3 4 GPIO_ACTIVE_LOW>;
>   	status = "okay";
>   };
>   
> diff --git a/arch/arm/boot/dts/exynos4412-midas.dtsi b/arch/arm/boot/dts/exynos4412-midas.dtsi
> index c0476c290977..aed2f2e2b0d1 100644
> --- a/arch/arm/boot/dts/exynos4412-midas.dtsi
> +++ b/arch/arm/boot/dts/exynos4412-midas.dtsi
> @@ -1269,8 +1269,7 @@
>   
>   &sdhci_2 {
>   	bus-width = <4>;
> -	cd-gpios = <&gpx3 4 GPIO_ACTIVE_HIGH>;
> -	cd-inverted;
> +	cd-gpios = <&gpx3 4 GPIO_ACTIVE_LOW>;
>   	pinctrl-0 = <&sd2_clk &sd2_cmd &sd2_bus4 &sdhci2_cd>;
>   	pinctrl-names = "default";
>   	vmmc-supply = <&ldo21_reg>;
> diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> index a09e46c9dbc0..2caa3132f34e 100644
> --- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> +++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> @@ -539,8 +539,7 @@
>   	pinctrl-names = "default";
>   	vmmc-supply = <&ldo21_reg>;
>   	vqmmc-supply = <&ldo4_reg>;
> -	cd-gpios = <&gpk2 2 GPIO_ACTIVE_HIGH>;
> -	cd-inverted;
> +	cd-gpios = <&gpk2 2 GPIO_ACTIVE_LOW>;
>   	status = "okay";
>   };
>   

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland