linux-kernel - Re: [PATCH 05/24] ARM: dts: exynos: override pins by label in Peach Pit

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Date:   Fri, 7 Jan 2022 00:12:22 +0530
From:   Alim Akhtar <alim.akhtar@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Tomasz Figa <tomasz.figa@...il.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Sylwester Nawrocki <snawrocki@...nel.org>,
        Sam Protsenko <semen.protsenko@...aro.org>,
        Chanho Park <chanho61.park@...sung.com>
Subject: Re: [PATCH 05/24] ARM: dts: exynos: override pins by label in Peach Pit

Hi Krzysztof

On Sat, Jan 1, 2022 at 11:15 AM Krzysztof Kozlowski
<krzysztof.kozlowski@...onical.com> wrote:
>
> Using node paths to extend or override a device tree node is error
> prone.  If there was a typo error, a new node will be created instead of
> extending the existing node.  This will lead to run-time errors that
> could be hard to detect.
>
> A mistyped label on the other hand, will cause a dtc compile error
> (during build time).
>
While it makes sense to do this, was wondering if you faced any issue
with the current implementation?

> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
> ---
Feel free to add
Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>

>  arch/arm/boot/dts/exynos5420-peach-pit.dts | 44 +++++++++++-----------
>  1 file changed, 22 insertions(+), 22 deletions(-)
>
> diff --git a/arch/arm/boot/dts/exynos5420-peach-pit.dts b/arch/arm/boot/dts/exynos5420-peach-pit.dts
> index e76fb104db19..1ae5528e9ebf 100644
> --- a/arch/arm/boot/dts/exynos5420-peach-pit.dts
> +++ b/arch/arm/boot/dts/exynos5420-peach-pit.dts
> @@ -868,27 +868,26 @@ pmic_dvs_1: pmic-dvs-1 {
>         };
>  };
>
> -&pinctrl_1 {
> -       /* Adjust WiFi drive strengths lower for EMI */
> -       sd1_clk: sd1-clk {
> -               samsung,pin-drv = <EXYNOS5420_PIN_DRV_LV3>;
> -       };
> +/* pinctrl_1 */
> +/* Adjust WiFi drive strengths lower for EMI */
> +&sd1_bus1 {
> +       samsung,pin-drv = <EXYNOS5420_PIN_DRV_LV3>;
> +};
>
> -       sd1_cmd: sd1-cmd {
> -               samsung,pin-drv = <EXYNOS5420_PIN_DRV_LV3>;
> -       };
> +&sd1_bus4 {
> +       samsung,pin-drv = <EXYNOS5420_PIN_DRV_LV3>;
> +};
>
> -       sd1_bus1: sd1-bus-width1 {
> -               samsung,pin-drv = <EXYNOS5420_PIN_DRV_LV3>;
> -       };
> +&sd1_bus8 {
> +       samsung,pin-drv = <EXYNOS5420_PIN_DRV_LV3>;
> +};
>
> -       sd1_bus4: sd1-bus-width4 {
> -               samsung,pin-drv = <EXYNOS5420_PIN_DRV_LV3>;
> -       };
> +&sd1_clk {
> +       samsung,pin-drv = <EXYNOS5420_PIN_DRV_LV3>;
> +};
>
> -       sd1_bus8: sd1-bus-width8 {
> -               samsung,pin-drv = <EXYNOS5420_PIN_DRV_LV3>;
> -       };
> +&sd1_cmd {
> +       samsung,pin-drv = <EXYNOS5420_PIN_DRV_LV3>;
>  };
>
>  &pinctrl_2 {
> @@ -907,12 +906,13 @@ pmic_dvs_3: pmic-dvs-3 {
>         };
>  };
>
> -&pinctrl_3 {
> -       /* Drive SPI lines at x2 for better integrity */
> -       spi2-bus {
> -               samsung,pin-drv = <EXYNOS5420_PIN_DRV_LV3>;
> -       };
> +/* pinctrl_3*/
> +/* Drive SPI lines at x2 for better integrity */
> +&spi2_bus {
> +       samsung,pin-drv = <EXYNOS5420_PIN_DRV_LV3>;
> +};
>
> +&pinctrl_3 {
>         /* Drive SPI chip select at x2 for better integrity */
>         ec_spi_cs: ec-spi-cs {
>                 samsung,pins = "gpb1-2";
> --
> 2.32.0
>


-- 
Regards,
Alim