linux-kernel - Re: [PATCH] ARM: dts: exynos: Add pin configuration for read strobe for Odroid XU3/XU4 eMMC

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Date:   Fri, 22 Feb 2019 11:29:13 +0100
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Anand Moon <linux.amoon@...il.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: exynos: Add pin configuration for read strobe
 for Odroid XU3/XU4 eMMC

Hi Anand,

On 2019-02-22 11:19, Anand Moon wrote:
> Add Read Strobe RDQS pin configuration for eMMC to support higher data rate read/write.
>
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
>  arch/arm/boot/dts/exynos5420-pinctrl.dtsi          | 6 ++++++
>  arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi | 2 +-
>  2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/exynos5420-pinctrl.dtsi b/arch/arm/boot/dts/exynos5420-pinctrl.dtsi
> index b82af7c89654..4fb3865e082a 100644
> --- a/arch/arm/boot/dts/exynos5420-pinctrl.dtsi
> +++ b/arch/arm/boot/dts/exynos5420-pinctrl.dtsi
> @@ -206,6 +206,12 @@
>  		samsung,pin-drv = <EXYNOS5420_PIN_DRV_LV4>;
>  	};
>  
> +	sd0_rdqs: sd0-rdqs {
> +		samsung,pins = "gpc0-7";
> +		samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
> +		samsung,pin-pud = <EXYNOS_PIN_PULL_DOWN>;
> +	};
> +

The above lines are not needed. There is already a sd0_rclk node with
exactly the same configuration just above your change.

>  	sd1_clk: sd1-clk {
>  		samsung,pins = "gpc1-0";
>  		samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
> diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> index b299e541cac0..d41397748ed2 100644
> --- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> +++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> @@ -411,7 +411,7 @@
>  	samsung,dw-mshc-hs400-timing = <0 2>;
>  	samsung,read-strobe-delay = <90>;
>  	pinctrl-names = "default";
> -	pinctrl-0 = <&sd0_clk &sd0_cmd &sd0_bus1 &sd0_bus4 &sd0_bus8 &sd0_cd &sd0_rclk>;
> +	pinctrl-0 = <&sd0_clk &sd0_cmd &sd0_rdqs &sd0_bus1 &sd0_bus4 &sd0_bus8 &sd0_cd &sd0_rclk>;
>  	bus-width = <8>;
>  	cap-mmc-highspeed;
>  	mmc-hs200-1_8v;

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