Re: [PATCH v8 6/8] MIPS: DTS: CI20: Add DT nodes for HDMI setup

[Geert Uytterhoeven <geert@linux-m68k.org>]

Hi Nikolaus,

On Wed, Nov 24, 2021 at 5:31 PM H. Nikolaus Schaller <hns@goldelico.com> wrote:
> > Am 24.11.2021 um 17:21 schrieb Geert Uytterhoeven <geert@linux-m68k.org>:
> > On Wed, Nov 24, 2021 at 5:19 PM H. Nikolaus Schaller <hns@goldelico.com> wrote:
> >>> Am 23.11.2021 um 21:10 schrieb Paul Cercueil <paul@crapouillou.net>:
> >>> Le mar., nov. 23 2021 at 19:13:59 +0100, H. Nikolaus Schaller <hns@goldelico.com> a écrit :
> >>>> +    assigned-clock-rates = <48000000>, <0>, <54000000>, <0>, <27000000>;
> >>>> };
> >>>> &tcu {
> >>>> @@ -509,6 +534,19 @@ pins_i2c4: i2c4 {
> >>>>             bias-disable;
> >>>>     };
> >>>> +    pins_hdmi_ddc: hdmi_ddc {
> >>>> +            function = "hdmi-ddc";
> >>>> +            groups = "hdmi-ddc";
> >>>> +            bias-disable;
> >>>> +    };
> >>>> +
> >>>> +    /* switch to PF25 as gpio driving DDC_SDA low */
> >>>> +    pins_hdmi_ddc_unwedge: hdmi_ddc {
> >>>> +            function = "hdmi-ddc";
> >>>> +            groups = "hdmi-ddc";
> >>>> +            bias-disable;
> >>>> +    };
> >>>
> >>> Your pins_hdmi_ddc and pins_hdmi_ddc_unwedge are the exact same? You could just use the former and pass it to both pinctrl-0 and pinctrl-1.
> >>
> >> This was forgotten to remove. We do not make use of the unwedge feature because I could not find out how to use pinctrl to switch this to gpio25 and drive it low.
> >
> > Using gpio-hog?
>
> well, AFAIR it activates the gpio permanently and is a propery of the gpio controller and not of pinmux.

Yes, hogs are permanently (ignoring DT overlay tricks).

> The driver assumes it can use pinmux state switching to drive the DDC_SDA line low on demand.

Add an optional wedge-gpios property for switching?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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