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

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Message-ID: <CAD=FV=W3X8W90vPdrDAymzTKj-J7QPyn4ukaLSOhEkCme3+r_Q@mail.gmail.com>
Date:   Wed, 21 Jul 2021 09:20:23 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Srinivasa Rao Mandadapu <srivasam@...eaurora.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

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.


> @@ -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?


> @@ -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`.