[PATCH 1/3] dt-bindings: Add a binding for the RPi firmware GPIO driver.
swarren at wwwdotorg.org
Mon Sep 26 09:38:52 PDT 2016
On 09/23/2016 12:39 PM, Stefan Wahren wrote:
> Hi Eric,
>> Eric Anholt <eric at anholt.net> hat am 19. September 2016 um 18:13 geschrieben:
>> The RPi firmware exposes all of the board's GPIO lines through
>> property calls. Linux chooses to control most lines directly through
>> the pinctrl driver, but for the FXL6408 GPIO expander on the Pi3, we
>> need to access them through the firmware.
>> Signed-off-by: Eric Anholt <eric at anholt.net>
>> .../bindings/gpio/gpio-raspberrypi-firmware.txt | 22
>> 1 file changed, 22 insertions(+)
>> create mode 100644
>> diff --git
>> new file mode 100644
>> index 000000000000..2b635c23a6f8
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/gpio/gpio-raspberrypi-firmware.txt
>> @@ -0,0 +1,22 @@
>> +Raspberry Pi power domain driver
>> +Required properties:
>> +- compatible: Should be "raspberrypi,firmware-gpio"
> i think the compatible should be more specific like
> and all information which aren't requestable from the firmware should be stored
> in a info structure. This makes the driver easier to extend in the future by
> adding new compatibles and their info structures.
Is this actually specific to the Pi3 at all? Isn't the FW the same
across all Pis; the part that's specific to the Pi3 is whether it's
useful to use that API?
As such, I'd suggest just raspberrypi,firmware-gpio as the compatible value.
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