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Diffstat (limited to 'Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt')
-rw-r--r-- | Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt | 30 |
1 files changed, 0 insertions, 30 deletions
diff --git a/Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt b/Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt deleted file mode 100644 index ce97265e23..0000000000 --- a/Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt +++ /dev/null @@ -1,30 +0,0 @@ -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>; - }; -}; |