linux-kernel - Re: [PATCH 06/18] arm64: dts: renesas: beacon: Configure Audio CODEC clocks

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Date:   Fri, 18 Dec 2020 13:57:32 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Adam Ford <aford173@...il.com>
Cc:     Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Adam Ford-BE <aford@...conembedded.com>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ALSA Development Mailing List <alsa-devel@...a-project.org>
Subject: Re: [PATCH 06/18] arm64: dts: renesas: beacon: Configure Audio CODEC clocks

Hi Adam,

On Thu, Dec 17, 2020 at 2:33 PM Adam Ford <aford173@...il.com> wrote:
> On Thu, Dec 17, 2020 at 5:12 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > CC alsa-devel
> >
> > On Sun, Dec 13, 2020 at 7:38 PM Adam Ford <aford173@...il.com> wrote:
> > > With the newly added configurable clock options, the audio CODEC can
> > > configure the mclk automatically.  Add the reference to the versaclock.
> > > Since the devices on I2C5 can communicate at 400KHz, let's also increase
> > > that too
> > >
> > > Signed-off-by: Adam Ford <aford173@...il.com>
> >
> > Thanks for your patch!
> >
> > > --- a/arch/arm64/boot/dts/renesas/beacon-renesom-baseboard.dtsi
> > > +++ b/arch/arm64/boot/dts/renesas/beacon-renesom-baseboard.dtsi
> > > @@ -424,13 +424,15 @@ &i2c0 {
> > >
> > >  &i2c5 {
> > >         status = "okay";
> > > -       clock-frequency = <100000>;
> > > +       clock-frequency = <400000>;
> > >         pinctrl-0 = <&i2c5_pins>;
> > >         pinctrl-names = "default";
> > >
> > >         codec: wm8962@1a {
> > >                 compatible = "wlf,wm8962";
> > >                 reg = <0x1a>;
> > > +               clocks = <&versaclock6_bb 3>;
> > > +               clock-names = "mclk";
> >
> > While the driver does get the (nameless) clock, the DT bindings lack any
> > mention of a clocks property.  It would be good to update the bindings.
>
> Agreed.  I'll push an update to add the clocks property.

Thanks!

> > Note that arch/arm/boot/dts/imx6-logicpd-baseboard.dtsi and
> > arch/arm64/boot/dts/freescale/imx8mm-beacon-baseboard.dtsi (both by your
> > hand) use "xclk" instead of "mclk"?
>
> On the schematics for the two imx boards, it's labeled as xclk, so it
> was named as such.  For this board, the schematic names it mclk. The
> driver doesn't care about the clock-names property, so I'll just
> remove them.

If there's a single clock, not using clock-names is fine.
If you do use clock-names, the names should be clock-centric, not
board-centric.

BTW, looking at the WM8962 datasheet, it's called "MCLK".

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