linux-kernel - Re: [PATCH v5 2/2] arm64: dts: qcom: sc7180-trogdor: Add lpass dai link for HDMI

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Date:   Thu, 22 Jul 2021 20:19:10 +0530
From:   Srinivasa Rao Mandadapu <srivasam@...eaurora.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        Rohit kumar <rohitkr@...eaurora.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Judy Hsiao <judyhsiao@...omium.org>,
        V Sujith Kumar Reddy <vsujithk@...eaurora.org>
Subject: Re: [PATCH v5 2/2] arm64: dts: qcom: sc7180-trogdor: Add lpass dai
 link for HDMI

Thanks for your time Doug!!

On 7/21/2021 9:50 PM, Doug Anderson wrote:
> Hi,
>
> On Wed, Jul 21, 2021 at 1:42 AM Srinivasa Rao Mandadapu
> <srivasam@...eaurora.org> wrote:
>> From: V Sujith Kumar Reddy <vsujithk@...eaurora.org>
>>
>> Add dai link in sc7180-trogdor.dtsi for supporting audio over DP
>>
>> Signed-off-by: V Sujith Kumar Reddy <vsujithk@...eaurora.org>
>> Signed-off-by: Srinivasa Rao Mandadapu <srivasam@...eaurora.org>
>> Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>> ---
>>   arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 17 +++++++++++++++++
>>   1 file changed, 17 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
>> index 31bf7c698b8f..a4cb9ee567ff 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
>> @@ -288,6 +288,7 @@ sound: sound {
>>                          "Headphone Jack", "HPOL",
>>                          "Headphone Jack", "HPOR";
>>
>> +               #sound-dai-cells = <0>;
> The `#sound-dai-cells` is not in the bindings. The bindings also say
> `additionalProperties: false`. So either your patch is wrong for
> including this or the bindings are wrong for omitting it. Which is it?
> I notice that downstream we don't have this.
>
Yes it's wrongly placed Here. Will remove it.
>> @@ -314,6 +315,18 @@ sound_multimedia1_codec: codec {
>>                                  sound-dai = <&max98357a>;
> Ideally you'll want to rebase to make context clean since the above
> got changed from `max98357a` to `max98360a`.
>
>
>>                          };
>>                  };
>> +
>> +               dai-link@2 {
>> +                       link-name = "MultiMedia2";
>> +                       reg = <2>;
> I am certainly not an expert, but I notice that downstream we have reg
> as <LPASS_DP_RX>, which makes the node name dai-link@5 instead of @2.
> Does that matter?
>
Yes,Here reg as <LPASS_DP_RX> is correct option. Will change 
accordingly.  But It seems dai-link@2 is appropriate as in this platform

we are using only 3 nodes. i.e. I2S primary, I2S secondary and DP node.

>> @@ -768,6 +781,10 @@ secondary_mi2s: mi2s@1 {
>>                  reg = <MI2S_SECONDARY>;
>>                  qcom,playback-sd-lines = <0>;
>>          };
>> +
>> +       hdmi-primary@0 {
>> +               reg = <LPASS_DP_RX>;
> Your node name and `reg` don't match. `LPASS_DP_RX` is 5 so the node
> name should include @5, not @0. I also notice that downstream the node
> name is called `hdmi`, not `hdmi-primary`. The downstream `hdmi` seems
> more parallel to the sibling nodes, like `mi2s@0` and `mi2s@1`.
Yes hdmi@2 is appropriate. will change accordingly.

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