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, 1 Sep 2016 12:19:47 +0200
From:   Javier Martinez Canillas <javier@....samsung.com>
To:     Krzysztof Kozlowski <k.kozlowski@...sung.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
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH 1/2] ARM: dts: exynos: Fix mismatched value for SD4 pull
 up/down configuration on exynos4210

Hello Krzysztof,

On 09/01/2016 10:37 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>
> ---

Reviewed-by: Javier Martinez Canillas <javier@....samsung.com>

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America