On Thu, Dec 17, 2020 at 4:54 AM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
>
> Hi Adam,
>
> On Sun, Dec 13, 2020 at 7:38 PM Adam Ford <aford173@xxxxxxxxx> wrote:
> > The SoC was expecting two clock sources with different frequencies.
> > One to support 44.1KHz and one to support 48KHz. With the newly added
> > ability to configure the programmably clock, configure both clocks.
> >
> > Beacause the SoC is expecting a fixed clock/oscillator, it doesn't
> > attempt to get and enable the clock for audio_clk_a. The choice to
> > use a fixed-factor-clock was due to the fact that it will automatically
> > enable the programmable clock frequency without change any code.
> >
> > Signed-off-by: Adam Ford <aford173@xxxxxxxxx>
>
> Thanks for your patch!
>
> > --- a/arch/arm64/boot/dts/renesas/beacon-renesom-baseboard.dtsi
> > +++ b/arch/arm64/boot/dts/renesas/beacon-renesom-baseboard.dtsi
> > @@ -250,9 +250,12 @@ ss_ep: endpoint {
> > };
> >
> > &audio_clk_a {
> > - clock-frequency = <24576000>;
> > - assigned-clocks = <&versaclock6_bb 4>;
> > - assigned-clock-rates = <24576000>;
> > + /delete-property/ clock-frequency;
> > + #clock-cells = <0>;
> > + compatible = "fixed-factor-clock";
> > + clock-mult = <1>;
> > + clock-div = <1>;
> > + clocks = <&versaclock6_bb 4>;
> > };
>
> Shouldn't you override the clocks property in the rcar_sound node
> instead, like is done in several other board DTS files (with cs2000)?
>
I guess there are multiple ways to do this. Because the rcar_sound
was already expecting a reference to audio_clk_a, it seemed less
intrusive this way. The way I proposed, we can use the default
rcar_sound clocking and just change the audio_clk node to enable the
versaclock output. The versaclock is driving the audio_clk_a
reference clock, so it seemed appropriate to put it there.
If you want me to change, I will.
> >
> > &audio_clk_b {
> > @@ -591,7 +594,7 @@ sound_pins: sound {
> > };
> >
> > sound_clk_pins: sound_clk {
> > - groups = "audio_clk_a_a";
> > + groups = "audio_clk_a_a", "audio_clk_b_a";
> > function = "audio_clk";
> > };
>
> Yes, this part was definitely missing.
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
>
> 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
