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 16:03:26 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-samsung-soc@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: dts: exynos: Add pin configuration for read strobe
 for Odroid XU3/XU4 eMMC

Hi Marek,

On Fri, 22 Feb 2019 at 15:59, Marek Szyprowski <m.szyprowski@...sung.com> wrote:
>
> 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.
>

Sorry once again, I failed to look closely., sorry for the noise.

Best Regards
-Anand

> >       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
>