linux-kernel - Re: [PATCH v2 10/11] arm64: dts: r8a77965-salvator-x: Enable DU external clocks and HDMI

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Date:   Tue, 29 May 2018 11:12:26 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Kieran Bingham <kieran.bingham@...asonboard.com>
Cc:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Simon Horman <horms@...ge.net.au>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 10/11] arm64: dts: r8a77965-salvator-x: Enable DU
 external clocks and HDMI

Hi Kieran,

On Tue, May 29, 2018 at 11:08 AM, Kieran Bingham
<kieran.bingham+renesas@...asonboard.com> wrote:
> On 28/05/18 10:06, Geert Uytterhoeven wrote:
>> On Fri, Apr 27, 2018 at 6:57 PM, Kieran Bingham
>> <kieran.bingham+renesas@...asonboard.com> wrote:
>>> The DU1 external dot clock is provided by the fixed frequency clock
>>> generator X21, while the DU0 and DU3 clocks are provided by the
>>> programmable Versaclock5 clock generator.
>>>
>>> Enable the clocks, and the HDMI encoder for the M3-N Salvator-X board
>>> and hook it up to the HDMI connector.
>>>
>>> Based on patches from Takeshi Kihara <takeshi.kihara.df@...esas.com>
>>>
>>> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
>>>
>>> ---
>>> v2:
>>>  - Remove LVDS clocks from DU node
>>>  - Merge DU Clocks and HDMI enablement
>>> ---
>>>  .../boot/dts/renesas/r8a77965-salvator-x.dts  | 28 +++++++++++++++++++
>>>  1 file changed, 28 insertions(+)
>>>
>>> diff --git a/arch/arm64/boot/dts/renesas/r8a77965-salvator-x.dts b/arch/arm64/boot/dts/renesas/r8a77965-salvator-x.dts
>>> index 75d890d91df9..340a3c72b65a 100644
>>> --- a/arch/arm64/boot/dts/renesas/r8a77965-salvator-x.dts
>>> +++ b/arch/arm64/boot/dts/renesas/r8a77965-salvator-x.dts
>>> @@ -19,3 +19,31 @@
>>>                 reg = <0x0 0x48000000 0x0 0x78000000>;
>>>         };
>>>  };
>>> +
>>> +&du {
>>> +       clocks = <&cpg CPG_MOD 724>,
>>> +                <&cpg CPG_MOD 723>,
>>> +                <&cpg CPG_MOD 721>,
>>> +                <&versaclock5 1>,
>>> +                <&x21_clk>,
>>> +                <&versaclock5 2>;
>>> +       clock-names = "du.0", "du.1", "du.3",
>>> +                     "dclkin.0", "dclkin.1", "dclkin.3";
>>> +};
>>> +
>>> +&hdmi0 {
>>> +       status = "okay";
>>> +
>>> +       ports {
>>> +               port@1 {
>>> +                       reg = <1>;
>>> +                       rcar_dw_hdmi0_out: endpoint {
>>> +                               remote-endpoint = <&hdmi0_con>;
>>> +                       };
>>> +               };
>>> +       };
>>> +};
>>> +
>>> +&hdmi0_con {
>>> +       remote-endpoint = <&rcar_dw_hdmi0_out>;
>>> +};
>>
>> I think the hdmi0 and hdmi0_con parts can be moved to salvator-common.dtsi.
>> Can we do that now (with stubs?), or does this have to wait until r8a77965 has
>> received HDMI sound support?
>
> I don't know about the sound integration I'm afraid, but common HDMI connections
> would certainly be a benefit I believe.
>
> Is this something you're looking to tackle? Or would you like
> me/Morimoto-san/media team to look at it?

Feel free to give it a try.

Thanks!

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