| Message ID | f400b48cbcd8a138c39d4e8f63d6c1f569090dcc.1519128054.git.baruch@tkos.co.il (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, Feb 20, 2018 at 6:19 AM, Baruch Siach <baruch@tkos.co.il> wrote: > 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> > --- > v5: > * Remove the 'firmware' property > * Note that the gpio node is a child of the firmware node > > v4: > * Move the example gpio node under the firmware node > * Rename gpio node name to plain 'gpio' > > v3: > * Rename node name. > > v2: > * Rename compatible string to raspberrypi,firmware-gpio > --- > .../bindings/gpio/raspberrypi,firmware-gpio.txt | 30 ++++++++++++++++++++++ > 1 file changed, 30 insertions(+) > create mode 100644 Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt Reviewed-by: Rob Herring <robh@kernel.org>
On Tue, Feb 20, 2018 at 1:19 PM, Baruch Siach <baruch@tkos.co.il> wrote: > 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> > --- > v5: > * Remove the 'firmware' property > * Note that the gpio node is a child of the firmware node This v5 patch applied to the GPIO tree for v4.17 with Rob's ACK. Yours, Linus Walleij
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..ce97265e23ba --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt @@ -0,0 +1,30 @@ +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. + +The Raspberry Pi GPIO expander node must be a child node of the Raspberry Pi +firmware node. + +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 + +Example: + +firmware: firmware-rpi { + compatible = "raspberrypi,bcm2835-firmware"; + mboxes = <&mailbox>; + + expgpio: gpio { + compatible = "raspberrypi,firmware-gpio"; + gpio-controller; + #gpio-cells = <2>; + }; +};
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> --- v5: * Remove the 'firmware' property * Note that the gpio node is a child of the firmware node v4: * Move the example gpio node under the firmware node * Rename gpio node name to plain 'gpio' v3: * Rename node name. v2: * Rename compatible string to raspberrypi,firmware-gpio --- .../bindings/gpio/raspberrypi,firmware-gpio.txt | 30 ++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt