linux-kernel - Re: [PATCH 1/3] arm64: dts: rockchip: add bus-width properties to mmc nodes for rk3328.dtsi

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Message-ID: <CAGb2v67N6t+C8dVKdjuOv1NzD9=3-n0GZQkshy1Pm6PFPJ87dQ@mail.gmail.com>
Date:   Tue, 21 Apr 2020 11:48:52 +0800
From:   Chen-Yu Tsai <wens@...nel.org>
To:     Johan Jonker <jbx6244@...il.com>
Cc:     Heiko Stübner <heiko@...ech.de>,
        devicetree <devicetree@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>
Subject: Re: [PATCH 1/3] arm64: dts: rockchip: add bus-width properties to mmc
 nodes for rk3328.dtsi

On Fri, Apr 17, 2020 at 2:19 AM Johan Jonker <jbx6244@...il.com> wrote:
>
> 'bus-width' and pinctrl containing the bus-pins
> should be in the same file, so add them to
> all mmc nodes in 'rk3328.dtsi'.

Nope. First of all, pinctrl usage is with pinctrl-N properties, not the
pinctrl device, and there are no defaults set for any of the mmc nodes.
Second, these are board design specific. For example, boards are free to
use just 4 bits for the eMMC if they so desire. So this should be in each
board dts file. If a board is missing this property, fix the board.

This applies to all three patches in the series.

ChenYu

> Signed-off-by: Johan Jonker <jbx6244@...il.com>
> ---
>  arch/arm64/boot/dts/rockchip/rk3328.dtsi | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/rockchip/rk3328.dtsi b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
> index 175060695..db2c3085e 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3328.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
> @@ -861,6 +861,7 @@
>                 clocks = <&cru HCLK_SDMMC>, <&cru SCLK_SDMMC>,
>                          <&cru SCLK_SDMMC_DRV>, <&cru SCLK_SDMMC_SAMPLE>;
>                 clock-names = "biu", "ciu", "ciu-drive", "ciu-sample";
> +               bus-width = <4>;
>                 fifo-depth = <0x100>;
>                 max-frequency = <150000000>;
>                 status = "disabled";
> @@ -873,6 +874,7 @@
>                 clocks = <&cru HCLK_SDIO>, <&cru SCLK_SDIO>,
>                          <&cru SCLK_SDIO_DRV>, <&cru SCLK_SDIO_SAMPLE>;
>                 clock-names = "biu", "ciu", "ciu-drive", "ciu-sample";
> +               bus-width = <4>;
>                 fifo-depth = <0x100>;
>                 max-frequency = <150000000>;
>                 status = "disabled";
> @@ -885,6 +887,7 @@
>                 clocks = <&cru HCLK_EMMC>, <&cru SCLK_EMMC>,
>                          <&cru SCLK_EMMC_DRV>, <&cru SCLK_EMMC_SAMPLE>;
>                 clock-names = "biu", "ciu", "ciu-drive", "ciu-sample";
> +               bus-width = <8>;
>                 fifo-depth = <0x100>;
>                 max-frequency = <150000000>;
>                 status = "disabled";
> --
> 2.11.0
>
>
> _______________________________________________
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> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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