linux-kernel - Re: [PATCH v3 07/11] ARM: sunxi: h3/h5: add simplefb nodes

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Date:   Fri, 29 Dec 2017 16:45:18 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v3 07/11] ARM: sunxi: h3/h5: add simplefb nodes

On Fri, Dec 22, 2017 at 8:22 PM, Icenowy Zheng <icenowy@...c.io> wrote:
> The H3/H5 SoCs have a HDMI output and a TV Composite output.
>
> Add simplefb nodes for these outputs.
>
> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> ---
>  arch/arm/boot/dts/sunxi-h3-h5.dtsi | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
>
> diff --git a/arch/arm/boot/dts/sunxi-h3-h5.dtsi b/arch/arm/boot/dts/sunxi-h3-h5.dtsi
> index fcb909658cf0..31478c03790d 100644
> --- a/arch/arm/boot/dts/sunxi-h3-h5.dtsi
> +++ b/arch/arm/boot/dts/sunxi-h3-h5.dtsi
> @@ -53,6 +53,35 @@
>         #address-cells = <1>;
>         #size-cells = <1>;
>
> +       chosen {
> +               #address-cells = <1>;
> +               #size-cells = <1>;
> +               ranges;
> +
> +               framebuffer-hdmi {
> +                       compatible = "allwinner,simple-framebuffer",
> +                                    "simple-framebuffer";
> +                       allwinner,pipeline = "mixer0-lcd0-hdmi";
> +                       clocks = <&display_clocks CLK_BUS_MIXER0>,
> +                                <&ccu CLK_BUS_TCON0>, <&ccu CLK_BUS_HDMI>,

Are the bus clocks necessary? It's not like simplefb is going to access
any of the control registers.

> +                                <&display_clocks CLK_MIXER0>,
> +                                <&ccu CLK_TCON0>, <&ccu CLK_HDMI>,
> +                                <&ccu CLK_HDMI_DDC>;

Is the DDC clock necessary? There's no usage of DDC with simplefb.

ChenYu

> +                       status = "disabled";
> +               };
> +
> +               framebuffer-tve {
> +                       compatible = "allwinner,simple-framebuffer",
> +                                    "simple-framebuffer";
> +                       allwinner,pipeline = "mixer1-lcd1-tve";
> +                       clocks = <&display_clocks CLK_BUS_MIXER1>,
> +                                <&ccu CLK_BUS_TCON1>, <&ccu CLK_BUS_TVE>,
> +                                <&display_clocks CLK_MIXER1>,
> +                                <&ccu CLK_TVE>;
> +                       status = "disabled";
> +               };
> +       };
> +
>         clocks {
>                 #address-cells = <1>;
>                 #size-cells = <1>;
> --
> 2.14.2
>