Hi Geert,
Thank you for the review.
On Tue, Oct 25, 2022 at 9:13 AM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
>
> Hi Prabhakar,
>
> On Thu, Sep 15, 2022 at 6:53 PM Prabhakar <prabhakar.csengg@xxxxxxxxx> wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> >
> > In preparation to re-use the RZ/G2UL SMARC SoM and carrier DTS/I with the
> > RZ/Five add /omit-if-no-ref/ keyword to pinmux entries as the support for
> > RZ/Five SMARC EVK will be gradually added.
> >
> > Once we have full blown support for RZ/Five SMARC EVK we can get rid of
> > the /omit-if-no-ref/ keyword.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
>
> Thanks for your patch!
>
> I finally had a deeper look at this...
>
> Why do you want to disable these nodes? While they are indeed not
> used yet on RZ/Five, they are valid hardware descriptions for the
> RZ/Five SMARC EVK, and their presence doesn't harm anything.
>
> I do see a valid use case for marking pin control subnodes with
> /omit-if-no-ref/: you can provide all possible configurations as a
> convenience for the user, so the user no longer has to look up the
> numeric parameters of the RZG2L_PORT_PINMUX() macros.
> But IMHO those would belong in the SoC-specific .dtsi, not in a
> board .dtsi. See e.g. the massive use of /omit-if-no-ref/ in sunxi
> and rockchip .dtsi files.
>
> Am I missing something?
>
My intention was to keep the DTB as minimal as possible so that it
includes just the required pinmuxes which were enabled on the RZ/Five.
For example [0], [1] we do delete the pinctrl for the nodes which are
marked as disabled. Do you think we should drop it?
But now that things are falling in place for RZ/Five we can ignore this patch.
[0] arch/arm64/boot/dts/renesas/rzg2lc-smarc.dtsi
[1] arch/arm64/boot/dts/renesas/rzg2ul-smarc.dtsi
Cheers,
Prabhakar
> > --- a/arch/arm64/boot/dts/renesas/rzg2ul-smarc-pinfunction.dtsi
> > +++ b/arch/arm64/boot/dts/renesas/rzg2ul-smarc-pinfunction.dtsi
> > @@ -12,12 +12,14 @@ &pinctrl {
> > pinctrl-0 = <&sound_clk_pins>;
> ^^^^^^^^^^^^^^
> > pinctrl-names = "default";
> >
> > + /omit-if-no-ref/
> > can0_pins: can0 {
> > pinmux = <RZG2L_PORT_PINMUX(1, 1, 3)>, /* TX */
> > <RZG2L_PORT_PINMUX(1, 2, 3)>; /* RX */
> > };
> >
> > #if (SW_ET0_EN_N)
> > + /omit-if-no-ref/
> > can0-stb-hog {
> > gpio-hog;
> > gpios = <RZG2L_GPIO(2, 2) GPIO_ACTIVE_HIGH>;
>
> > @@ -94,11 +103,13 @@ sd1_mux_uhs {
> > };
> > };
> >
> > + /omit-if-no-ref/
> > sound_clk_pins: sound_clk {
>
> FTR, this one is always referenced.
>
> > pins = "AUDIO_CLK1", "AUDIO_CLK2";
> > input-enable;
> > };
>
> 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
