linux-kernel - Re: [PATCH 1/2] ARM: dts: exynos: Fix mismatched value for SD4 pull up/down configuration on exynos4210

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Date:   Thu, 01 Sep 2016 13:17:35 +0200
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:     javier@....samsung.com, Arnd Bergmann <arnd@...db.de>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ARM: dts: exynos: Fix mismatched value for SD4 pull
 up/down configuration on exynos4210


Hi,

On Thursday, September 01, 2016 10:37:01 AM Krzysztof Kozlowski wrote:
> The pinctrl pull up/down register on exynos4210 is 2-bit wide for each
> pin and it accepts only values of 0, 1 and 3.  The pins sd4-bus-width8
> were configured with value of 4.  The driver does not validate the value
> so this overflow effectively set a bit 1 in adjacent pins thus
> configuring them to pull down.
> 
> The author's intention was probably to set drive strength of 4x.  All
> other bus-widths pins are configured with pull up and drive strength of
> 4x.  Fix this one with same pattern.
> 
> Fixes: 87711d8c7c70 ("ARM: dts: Add pinctrl node entries for SAMSUNG EXYNOS4210 SoC")
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>

sd4_bus8 is currently unused by other drivers so there should be no
problem with this change.

Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>

> ---
>  arch/arm/boot/dts/exynos4210-pinctrl.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/exynos4210-pinctrl.dtsi b/arch/arm/boot/dts/exynos4210-pinctrl.dtsi
> index 8046340e50ac..d9b6d25e4abe 100644
> --- a/arch/arm/boot/dts/exynos4210-pinctrl.dtsi
> +++ b/arch/arm/boot/dts/exynos4210-pinctrl.dtsi
> @@ -649,7 +649,7 @@
>  		sd4_bus8: sd4-bus-width8 {
>  			samsung,pins = "gpk1-3", "gpk1-4", "gpk1-5", "gpk1-6";
>  			samsung,pin-function = <EXYNOS_PIN_FUNC_3>;
> -			samsung,pin-pud = <4>;
> +			samsung,pin-pud = <EXYNOS_PIN_PULL_UP>;
>  			samsung,pin-drv = <EXYNOS4_PIN_DRV_LV4>;
>  		};

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics