linux-kernel - Re: [RFT] arm64: ARM: dts: exynos: Remove double SD card detect pin inversion on TM2

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Date:   Mon, 24 Sep 2018 09:41:01 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Subject: Re: [RFT] arm64: ARM: dts: exynos: Remove double SD card detect pin
 inversion on TM2

Hi Krzysztof,

On 2018-09-21 20:30, 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>

Works fine on TM2 and TM2e. However I'm not sure if it makes sense to
refer to the SDHCI standard, as Exynos5433 has only DWMMC host controllers.

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

> ---
>   arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
> index a1e3194b7483..86d8ddc3288a 100644
> --- a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
> +++ b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
> @@ -939,8 +939,7 @@
>   	status = "okay";
>   	cap-sd-highspeed;
>   	disable-wp;
> -	cd-gpios = <&gpa2 4 GPIO_ACTIVE_HIGH>;
> -	cd-inverted;
> +	cd-gpios = <&gpa2 4 GPIO_ACTIVE_LOW>;
>   	card-detect-delay = <200>;
>   	samsung,dw-mshc-ciu-div = <3>;
>   	samsung,dw-mshc-sdr-timing = <0 4>;

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