linux-kernel - Re: [PATCH v2 2/2] arm64: dts: imx8mm-evk: Enable audio codec wm8524

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Date:   Tue, 23 Apr 2019 09:31:25 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Daniel Baluta <daniel.baluta@...il.com>
Cc:     Daniel Baluta <daniel.baluta@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        Aisheng Dong <aisheng.dong@....com>,
        Peng Fan <peng.fan@....com>, Anson Huang <anson.huang@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        dl-linux-imx <linux-imx@....com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "S.j. Wang" <shengjiu.wang@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 2/2] arm64: dts: imx8mm-evk: Enable audio codec wm8524

Hi Daniel,

On 19-04-23 09:22, Daniel Baluta wrote:
> Hi Marco,
> 
> On Tue, Apr 23, 2019 at 8:19 AM Marco Felsch <m.felsch@...gutronix.de> wrote:
> >
> > Hi Daniel,
> >
> > On 19-04-22 19:36, Daniel Baluta wrote:
> > > i.MX8MM has one wm8524 audio codec connected with
> > > SAI3 digital audio interface.
> > >
> > > This patch uses simple-card machine driver in order
> > > to enable wm8524 codec.
> > >
> > > We need to set:
> > >       * SAI3 pinctrl configuration
> > >       * clock hierarchy
> > >       * codec node
> > >       * simple-card configuration
> > >
> > > Signed-off-by: Daniel Baluta <daniel.baluta@....com>
> > > ---
> > >  arch/arm64/boot/dts/freescale/imx8mm-evk.dts | 48 ++++++++++++++++++++
> > >  1 file changed, 48 insertions(+)
> > >
> > > diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> > > index 2d5d89475b76..207b13266a96 100644
> > > --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> > > +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> > > @@ -37,6 +37,35 @@
> > >               gpio = <&gpio2 19 GPIO_ACTIVE_HIGH>;
> > >               enable-active-high;
> > >       };
> > > +
> > > +     wm8524: audio-codec {
> > > +             #sound-dai-cells = <0>;
> > > +             compatible = "wlf,wm8524";
> > > +             wlf,mute-gpios = <&gpio5 21 GPIO_ACTIVE_LOW>;
> >
> > I would mux the gpio where I use them.
> 
> I'm not sure I understand this. Can you provide an example.

Just adding a princtrl-0 and pinctrl-names entry to mux the gpio here
rather than within the sai node.

> >
> > > +     };
> > > +
> > > +     sound-wm8524 {
> > > +             compatible = "simple-audio-card";
> > > +             simple-audio-card,name = "wm8524-audio";
> > > +             simple-audio-card,format = "i2s";
> > > +             simple-audio-card,frame-master = <&cpudai>;
> > > +             simple-audio-card,bitclock-master = <&cpudai>;
> > > +             simple-audio-card,widgets =
> > > +                     "Line", "Left Line Out Jack",
> > > +                     "Line", "Right Line Out Jack";
> > > +             simple-audio-card,routing =
> > > +                     "Left Line Out Jack", "LINEVOUTL",
> > > +                     "Right Line Out Jack", "LINEVOUTR";
> > > +
> > > +             cpudai: simple-audio-card,cpu {
> > > +                     sound-dai = <&sai3>;
> > > +             };
> > > +
> > > +             link_codec: simple-audio-card,codec {
> >
> > Can you drop that phandle?
> 
> I see your point here. But for symmetry and consistency with
> imx8mm-evk I would prefer
> to keep it like that.
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux.git/tree/arch/arm64/boot/dts/freescale/imx8mq-evk.dts?h=for-next#n59
> 

Got your point but I think that the evk dts will be used as base for
future dts. Instead of keep them here I would send a patch to drop the
phandle in the imx8mq-evk.dts since it isn't necessary.

Regards,
  Marco