linux-kernel - Re: [PATCH 1/8] ARM: dts: bcm283x: Define standard pinctrl groups in the gpio node.

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Date:   Fri, 09 Sep 2016 14:20:57 -0700
From:   Eric Anholt <eric@...olt.net>
To:     Gerd Hoffmann <kraxel@...hat.com>,
        Stefan Wahren <stefan.wahren@...e.com>
Cc:     linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Scott Branden <sbranden@...adcom.com>,
        Ray Jui <rjui@...adcom.com>,
        Russell King <linux@...linux.org.uk>,
        open list <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com,
        Mark Rutland <mark.rutland@....com>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH 1/8] ARM: dts: bcm283x: Define standard pinctrl groups in the gpio node.

e<#secure method=pgpmime mode=sign>
Gerd Hoffmann <kraxel@...hat.com> writes:

>   Hi,
>
>> According to this page [1] the pinctrl group for parallel display interface is
>> missing. Is it intended?
>> 
>> [1] - http://elinux.org/RPi_BCM2835_GPIOs
>
> Just an oversight I guess.  Eric?
>
> Does this look correct?
>
> +                       dpi_gpio4: dpi_gpio4 {
> +                               brcm,pins = <4 5 6 7 8 9 10 11 12 13
> +                                            14 15 16 17 18 19 20 21
> +                                            22 23 24 25 26 27>;
> +                               brcm,function = <BCM2835_FSEL_ALT2>;
> +                       };

For DPI, you also need pins 0-3 in there for clock and syncs.

That set of data pins would be for a 24-bit mode, which is what we
should be using for the Adafruit kippah + 7" panel combo.