linux-kernel - Re: [linux-sunxi] [PATCH v5 09/20] arm64: dts: allwinner: h6: Add DAI node and soundcard for HDMI

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Message-ID: <CAGb2v64U9b1Ayq-XNCHb3z6spsds6eDaz3C4EsV9xFOquHrB7w@mail.gmail.com>
Date:   Mon, 28 Sep 2020 13:42:10 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Maxime Ripard <mripard@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Marcus Cooper <codekipper@...il.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH v5 09/20] arm64: dts: allwinner: h6: Add DAI
 node and soundcard for HDMI

On Mon, Sep 28, 2020 at 1:32 PM Chen-Yu Tsai <wens@...e.org> wrote:
>
> On Mon, Sep 28, 2020 at 3:29 AM Clément Péron <peron.clem@...il.com> wrote:
> >
> > From: Jernej Skrabec <jernej.skrabec@...l.net>
> >
> > Add the I2S node used by the HDMI and a simple-soundcard to
> > link audio between HDMI and I2S.
> >
> > Note that the HDMI codec requires an inverted frame clock and
> > a fixed I2S width. As there is no such option for I2S we use
> > TDM property of the simple-soundcard to do that.
> >
> > Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> > Signed-off-by: Marcus Cooper <codekipper@...il.com>
> > Signed-off-by: Clément Péron <peron.clem@...il.com>
> > ---
> >  arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi | 33 ++++++++++++++++++++
> >  1 file changed, 33 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > index 28c77d6872f6..a8853ee7885a 100644
> > --- a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > @@ -67,6 +67,25 @@ de: display-engine {
> >                 status = "disabled";
> >         };
> >
> > +       hdmi_sound: hdmi-sound {
> > +               compatible = "simple-audio-card";
> > +               simple-audio-card,format = "i2s";
> > +               simple-audio-card,name = "sun50i-h6-hdmi";
> > +               simple-audio-card,mclk-fs = <128>;
> > +               simple-audio-card,frame-inversion;
> > +               status = "disabled";
> > +
> > +               simple-audio-card,codec {
> > +                       sound-dai = <&hdmi>;
> > +               };
> > +
> > +               simple-audio-card,cpu {
> > +                       sound-dai = <&i2s1>;
> > +                       dai-tdm-slot-num = <2>;
>
> Doesn't this end up limiting the number of audio channels HDMI can carry?
> AFAICT the TDM properties are all optional, so just leave it out.
>
> Same goes for the other two patches.
>
> > +                       dai-tdm-slot-width = <32>;
> > +               };
> > +       };
> > +
> >         osc24M: osc24M_clk {
> >                 #clock-cells = <0>;
> >                 compatible = "fixed-clock";
> > @@ -609,6 +628,19 @@ mdio: mdio {
> >                         };
> >                 };
> >
> > +               i2s1: i2s@...1000 {
> > +                       #sound-dai-cells = <0>;
> > +                       compatible = "allwinner,sun50i-h6-i2s";
> > +                       reg = <0x05091000 0x1000>;
> > +                       interrupts = <GIC_SPI 19 IRQ_TYPE_LEVEL_HIGH>;
> > +                       clocks = <&ccu CLK_BUS_I2S1>, <&ccu CLK_I2S1>;
> > +                       clock-names = "apb", "mod";
> > +                       dmas = <&dma 4>, <&dma 4>;
> > +                       resets = <&ccu RST_BUS_I2S1>;
> > +                       dma-names = "rx", "tx";

Sorry, missed this one.

Given that usage for this interface is transmit only, and there is no
RX DRQ number assigned to it, you should drop the RX DMA number and name.

> > +                       status = "disabled";
> > +               };
> > +
> >                 spdif: spdif@...3000 {
> >                         #sound-dai-cells = <0>;
> >                         compatible = "allwinner,sun50i-h6-spdif";
> > @@ -739,6 +771,7 @@ ohci3: usb@...1400 {
> >                 };
> >
> >                 hdmi: hdmi@...0000 {
> > +                       #sound-dai-cells = <0>;
> >                         compatible = "allwinner,sun50i-h6-dw-hdmi";
> >                         reg = <0x06000000 0x10000>;
> >                         reg-io-width = <1>;
>
> The rest of the patch looks OK.