linux-kernel - Re: [PATCH v2 3/3] riscv: dts: starfive: Add mmc node

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Date:   Mon, 2 Jan 2023 15:03:22 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     William Qiu <william.qiu@...rfivetech.com>
Cc:     linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-mmc@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] riscv: dts: starfive: Add mmc node

On Tue, 27 Dec 2022 at 13:22, William Qiu <william.qiu@...rfivetech.com> wrote:
>
> This adds the mmc node for the StarFive JH7110 SoC.
> Set sdioo node to emmc and set sdio1 node to sd.
>
> Signed-off-by: William Qiu <william.qiu@...rfivetech.com>
> ---
>  .../jh7110-starfive-visionfive-v2.dts         | 25 ++++++++++++
>  arch/riscv/boot/dts/starfive/jh7110.dtsi      | 38 +++++++++++++++++++
>  2 files changed, 63 insertions(+)
>
> diff --git a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-v2.dts b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-v2.dts
> index c8946cf3a268..d8244fd1f5a0 100644
> --- a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-v2.dts
> +++ b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-v2.dts
> @@ -47,6 +47,31 @@ &clk_rtc {
>         clock-frequency = <32768>;
>  };
>
> +&mmc0 {
> +       max-frequency = <100000000>;
> +       card-detect-delay = <300>;

Nitpick:  This seems redundant for a non-removable card!?

> +       bus-width = <8>;
> +       cap-mmc-highspeed;
> +       mmc-ddr-1_8v;
> +       mmc-hs200-1_8v;
> +       non-removable;
> +       cap-mmc-hw-reset;
> +       post-power-on-delay-ms = <200>;
> +       status = "okay";
> +};
> +
> +&mmc1 {
> +       max-frequency = <100000000>;
> +       card-detect-delay = <300>;

Nitpick: This looks redundant for polling based card detection
(broken-cd is set a few lines below).

> +       bus-width = <4>;
> +       no-sdio;
> +       no-mmc;
> +       broken-cd;
> +       cap-sd-highspeed;
> +       post-power-on-delay-ms = <200>;
> +       status = "okay";
> +};
> +
>  &gmac0_rmii_refin {
>         clock-frequency = <50000000>;
>  };
> diff --git a/arch/riscv/boot/dts/starfive/jh7110.dtsi b/arch/riscv/boot/dts/starfive/jh7110.dtsi
> index c22e8f1d2640..08a780d2c0f4 100644
> --- a/arch/riscv/boot/dts/starfive/jh7110.dtsi
> +++ b/arch/riscv/boot/dts/starfive/jh7110.dtsi
> @@ -331,6 +331,11 @@ aoncrg: clock-controller@...00000 {
>                         #reset-cells = <1>;
>                 };
>
> +               syscon: syscon@...30000 {
> +                       compatible = "starfive,syscon", "syscon";
> +                       reg = <0x0 0x13030000 0x0 0x1000>;
> +               };
> +
>                 gpio: gpio@...40000 {
>                         compatible = "starfive,jh7110-sys-pinctrl";
>                         reg = <0x0 0x13040000 0x0 0x10000>;
> @@ -433,5 +438,38 @@ uart5: serial@...20000 {
>                         reg-shift = <2>;
>                         status = "disabled";
>                 };
> +
> +               /* unremovable emmc as mmcblk0 */

Don't confuse the mmc0 node name with mmcblk0. There is no guarantee
that this is true, unless you also specify an alias.

> +               mmc0: mmc@...10000 {
> +                       compatible = "starfive,jh7110-mmc";
> +                       reg = <0x0 0x16010000 0x0 0x10000>;
> +                       clocks = <&syscrg JH7110_SYSCLK_SDIO0_AHB>,
> +                                <&syscrg JH7110_SYSCLK_SDIO0_SDCARD>;
> +                       clock-names = "biu","ciu";
> +                       resets = <&syscrg JH7110_SYSRST_SDIO0_AHB>;
> +                       reset-names = "reset";
> +                       interrupts = <74>;
> +                       fifo-depth = <32>;
> +                       fifo-watermark-aligned;
> +                       data-addr = <0>;
> +                       starfive,syscon = <&syscon 0x14 0x1a 0x7c000000>;
> +                       status = "disabled";
> +               };
> +
> +               mmc1: mmc@...20000 {
> +                       compatible = "starfive,jh7110-mmc";
> +                       reg = <0x0 0x16020000 0x0 0x10000>;
> +                       clocks = <&syscrg JH7110_SYSCLK_SDIO1_AHB>,
> +                                <&syscrg JH7110_SYSCLK_SDIO1_SDCARD>;
> +                       clock-names = "biu","ciu";
> +                       resets = <&syscrg JH7110_SYSRST_SDIO1_AHB>;
> +                       reset-names = "reset";
> +                       interrupts = <75>;
> +                       fifo-depth = <32>;
> +                       fifo-watermark-aligned;
> +                       data-addr = <0>;
> +                       starfive,syscon = <&syscon 0x9c 0x1 0x3e>;
> +                       status = "disabled";
> +               };
>         };
>  };

Kind regards
Uffe