linux-kernel - Re: [linux-sunxi] [PATCH 1/2] ARM: sun8i: v3s: add device nodes for DE2 display pipeline

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Message-ID: <5FF9B3F8-01F6-4B17-958C-9A4245199716@aosc.io>
Date:   Thu, 25 May 2017 21:54:53 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     wens@...e.org, Chen-Yu Tsai <wens@...e.org>
CC:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [linux-sunxi] [PATCH 1/2] ARM: sun8i: v3s: add device nodes for DE2 display pipeline



于 2017年5月25日 GMT+08:00 下午4:37:31, Chen-Yu Tsai <wens@...e.org> 写到:
>On Wed, May 24, 2017 at 7:17 PM, Icenowy Zheng <icenowy@...c.io> wrote:
>> Allwinner V3s SoC features a "Display Engine 2.0" with only one mixer
>> and only one TCON connected to this mixer, which have RGB LCD output.
>>
>> Add device nodes for this display pipeline.
>>
>> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
>> ---
>>  arch/arm/boot/dts/sun8i-v3s.dtsi | 83
>++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 83 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/sun8i-v3s.dtsi
>b/arch/arm/boot/dts/sun8i-v3s.dtsi
>> index a49ebef53c91..3a06dc5b3746 100644
>> --- a/arch/arm/boot/dts/sun8i-v3s.dtsi
>> +++ b/arch/arm/boot/dts/sun8i-v3s.dtsi
>> @@ -61,6 +61,12 @@
>>                 };
>>         };
>>
>> +       de: display-engine {
>> +               compatible = "allwinner,sun8i-v3s-display-engine";
>> +               allwinner,pipelines = <&mixer0>;
>> +               status = "disabled";
>> +       };
>> +
>>         timer {
>>                 compatible = "arm,armv7-timer";
>>                 interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) |
>IRQ_TYPE_LEVEL_LOW)>,
>> @@ -95,6 +101,83 @@
>>                 #size-cells = <1>;
>>                 ranges;
>>
>> +               display_clocks: clock@...0000 {
>> +                       compatible = "allwinner,sun8i-v3s-de2-clk";
>> +                       reg = <0x01000000 0x100000>;
>> +                       clocks = <&ccu CLK_DE>,
>> +                                <&ccu CLK_BUS_DE>;
>> +                       clock-names = "mod",
>> +                                     "bus";
>> +                       resets = <&ccu RST_BUS_DE>;
>> +                       #clock-cells = <1>;
>> +                       #reset-cells = <1>;
>> +               };
>> +
>> +               mixer0: mixer@...0000 {
>
>Since there's only one, can you drop the numbering suffix?
>Same with the TCON.

I just want to keep the consistency with dual-pipeline SoCs. (H3, A64, H5, etc)

However, if dropping it is better, I will drop it -- I think usually for things
that is available for multiple on some SoCs and single on others,
we keep the 0 in node name...

>
>> +                       compatible = "allwinner,sun8i-v3s-de2-mixer";
>> +                       reg = <0x01100000 0x100000>;
>
>The display engine also has an interrupt. Please list it

It's a overall interrupt for DE2, not mixer interrupt.

I will add it after we have proper interrupt chaining facility for DE2.

It cannot fit here in mixer node.

>
>ChenYu