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

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Message-ID: <CAMuHMdWO3yosf5eyTPpydVuT3pwvuw9Q=2BUxq+rxPjE3iSnrw@mail.gmail.com>
Date:   Wed, 24 Nov 2021 17:21:43 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Paul Cercueil <paul@...pouillou.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Kees Cook <keescook@...omium.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Harry Wentland <harry.wentland@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        Maxime Ripard <maxime@...no.tech>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Paul Boddie <paul@...die.org.uk>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        letux-kernel@...nphoenux.org, Jonas Karlman <jonas@...boo.se>,
        DRI Development <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v8 6/8] MIPS: DTS: CI20: Add DT nodes for HDMI setup

Hi Nikolaus,

On Wed, Nov 24, 2021 at 5:19 PM H. Nikolaus Schaller <hns@...delico.com> wrote:
> > Am 23.11.2021 um 21:10 schrieb Paul Cercueil <paul@...pouillou.net>:
> > Le mar., nov. 23 2021 at 19:13:59 +0100, H. Nikolaus Schaller <hns@...delico.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?

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