| Message ID | a93ba9ec4d3d3ff6d1e2a79f4f813a2f86c4086b.1515698418.git.baruch@tkos.co.il (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Baruch, > Baruch Siach <baruch@tkos.co.il> hat am 11. Januar 2018 um 20:44 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@tkos.co.il> > --- > v2: > * Rename compatible string to raspberrypi,firmware-gpio > --- > .../bindings/gpio/raspberrypi,firmware-gpio.txt | 24 ++++++++++++++++++++++ > 1 file changed, 24 insertions(+) > create mode 100644 Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt > > diff --git a/Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt b/Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt > new file mode 100644 > index 000000000000..8faf269cf541 > --- /dev/null > +++ b/Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.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 "raspberrypi,firmware-gpio" > +- 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 { just a nit, please change this to expgpio: gpio-expander { just like in patch #4 Thanks Stefan
diff --git a/Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt b/Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt new file mode 100644 index 000000000000..8faf269cf541 --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.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 "raspberrypi,firmware-gpio" +- 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 = "raspberrypi,firmware-gpio"; + gpio-controller; + #gpio-cells = <2>; + firmware = <&firmware>; +};
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@tkos.co.il> --- v2: * Rename compatible string to raspberrypi,firmware-gpio --- .../bindings/gpio/raspberrypi,firmware-gpio.txt | 24 ++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt