linux-kernel - Re: [PATCH v2 3/3] arm64: dts: renesas: falcon-cpu: Add DSI display output

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Date:   Tue, 21 Sep 2021 17:59:24 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Kieran Bingham <kieran.bingham@...asonboard.com>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] arm64: dts: renesas: falcon-cpu: Add DSI display output

Hi Kieran,

On Thu, Sep 2, 2021 at 1:53 AM Kieran Bingham
<kieran.bingham@...asonboard.com> wrote:
> From: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
>
> Provide the display output using the sn65dsi86 MIPI DSI bridge.
>
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>

Thanks for your patch!

> --- a/arch/arm64/boot/dts/renesas/r8a779a0-falcon-cpu.dtsi
> +++ b/arch/arm64/boot/dts/renesas/r8a779a0-falcon-cpu.dtsi
> @@ -66,6 +66,15 @@ memory@...000000 {
>                 reg = <0x7 0x00000000 0x0 0x80000000>;
>         };
>
> +       reg_1p2v: regulator-1p2v {
> +               compatible = "regulator-fixed";
> +               regulator-name = "fixed-1.2V";
> +               regulator-min-microvolt = <1800000>;
> +               regulator-max-microvolt = <1800000>;
> +               regulator-boot-on;
> +               regulator-always-on;
> +       };
> +
>         reg_1p8v: regulator-1p8v {
>                 compatible = "regulator-fixed";
>                 regulator-name = "fixed-1.8V";
> @@ -83,6 +92,46 @@ reg_3p3v: regulator-3p3v {
>                 regulator-boot-on;
>                 regulator-always-on;
>         };
> +
> +       mini-dp-con {
> +               compatible = "dp-connector";
> +               label = "CN5";
> +               type = "mini";
> +
> +               port {
> +                       mini_dp_con_in: endpoint {
> +                               remote-endpoint = <&sn65dsi86_out>;
> +                       };
> +               };
> +       };
> +
> +       sn65dsi86_refclk: sn65dsi86-refclk {
> +               compatible = "fixed-clock";
> +               #clock-cells = <0>;
> +               clock-frequency = <38400000>;
> +       };
> +};
> +
> +&dsi0 {
> +       status = "okay";
> +
> +       clocks = <&cpg CPG_MOD 415>,
> +                <&cpg CPG_CORE R8A779A0_CLK_DSI>,
> +                <&extal_clk>;
> +       clock-names = "fck", "dsi", "extal";

Ah, that's where the third clock was hiding ;-)

Is this hardwired to extal, or board-specific?
In case of the former, I think it should be moved to the .dtsi.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds