Hi Stefan,
On Tue, Jan 02, 2018 at 07:26:00PM +0100, Stefan Wahren wrote:
> > Baruch Siach <baruch@xxxxxxxxxx> hat am 2. Januar 2018 um 14:19 geschrieben:
> >
> >
> > The Raspberry Pi 3 GPIO expander is controlled by the VC4 firmware over
> > I2C. The firmware mailbox interface allows the ARM core to control the
> > GPIO lines.
> >
> > Signed-off-by: Baruch Siach <baruch@xxxxxxxxxx>
> > ---
> > .../bindings/gpio/brcm,bcm2835-expgpio.txt | 24 ++++++++++++++++++++++
> > 1 file changed, 24 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/gpio/brcm,bcm2835-expgpio.txt
> >
> > diff --git a/Documentation/devicetree/bindings/gpio/brcm,bcm2835-expgpio.txt b/Documentation/devicetree/bindings/gpio/brcm,bcm2835-expgpio.txt
> > new file mode 100644
> > index 000000000000..55257f31a9be
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/gpio/brcm,bcm2835-expgpio.txt
> > @@ -0,0 +1,24 @@
> > +Raspberry Pi GPIO expander
> > +
> > +The Raspberry Pi 3 GPIO expander is controlled by the VC4 firmware. The
> > +firmware exposes a mailbox interface that allows the ARM core to control the
> > +GPIO lines on the expander.
> > +
> > +Required properties:
> > +
> > +- compatible : Should be "brcm,bcm2835-expgpio"
>
> from my understand this driver is specific to the Raspberry Pi and it's
> vendor is the Raspberry Pi Foundation. So i prefer Eric's suggestion of
> "raspberrypi,firmware-gpio", which also applies to the filename.
That was my inclination as well. But I thought that keeping DT compatibility
with downstream is desirable.
I'll change compatible/file/driver names to raspberry something.
baruch
> > +- gpio-controller : Marks the device node as a gpio controller
> > +- #gpio-cells : Should be two. The first cell is the pin number, and
> > + the second cell is used to specify the gpio polarity:
> > + 0 = active high
> > + 1 = active low
> > +- firmware : Reference to the RPi firmware device node
> > +
> > +Example:
> > +
> > +expgpio: expgpio {
> > + compatible = "brcm,bcm2835-expgpio";
> > + gpio-controller;
> > + #gpio-cells = <2>;
> > + firmware = <&firmware>;
> > +};
--
http://baruch.siach.name/blog/ ~. .~ Tk Open Systems
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- baruch@xxxxxxxxxx - tel: +972.52.368.4656, http://www.tkos.co.il -
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