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

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Date:   Sun, 11 Sep 2016 22:22:36 +0100
From:   Dave Stevenson <linux-rpi-kernel@...tevenson.freeserve.co.uk>
To:     Eric Anholt <eric@...olt.net>, Gerd Hoffmann <kraxel@...hat.com>,
        Stefan Wahren <stefan.wahren@...e.com>
Cc:     Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        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,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/8] ARM: dts: bcm283x: Define standard pinctrl groups in
 the gpio node.

On 09/09/16 22:20, Eric Anholt wrote:
> 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.
The Kippah is only 18bit, RGB666.
https://www.adafruit.com/products/2454
"The pins used are GPIO 2 through 21 inclusive. That means you don't get 
the UART RX/TX pins (no console cable) and you don't get the standard 
user I2C pins, the EEPROM I2C pins, or hardware SPI pins. You do get to 
use pins #22, #23, #24, #25, #26 and #27, and the USB ports are fine to 
use too."

On the forum there are some that report they have used DPI in RGB888, 
but they're not using the Kippah. I had mentioned this to Phil E that 
there should be a dpi18 overlay, but not got around to sorting that.

>
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