diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/input/atmel,maxtouch.txt | 2 | ||||
| -rw-r--r-- | Documentation/devicetree/bindings/serio/ps2-gpio.txt | 23 | ||||
| -rw-r--r-- | Documentation/gpio/drivers-on-gpio.txt | 5 |
3 files changed, 30 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/input/atmel,maxtouch.txt b/Documentation/devicetree/bindings/input/atmel,maxtouch.txt index 1852906517ab..23e3abc3fdef 100644 --- a/Documentation/devicetree/bindings/input/atmel,maxtouch.txt +++ b/Documentation/devicetree/bindings/input/atmel,maxtouch.txt @@ -22,6 +22,8 @@ Optional properties for main touchpad device: experiment to determine which bit corresponds to which input. Use KEY_RESERVED for unused padding values. +- reset-gpios: GPIO specifier for the touchscreen's reset pin (active low) + Example: touch@4b { diff --git a/Documentation/devicetree/bindings/serio/ps2-gpio.txt b/Documentation/devicetree/bindings/serio/ps2-gpio.txt new file mode 100644 index 000000000000..7b7bc9cdf986 --- /dev/null +++ b/Documentation/devicetree/bindings/serio/ps2-gpio.txt @@ -0,0 +1,23 @@ +Device-Tree binding for ps/2 gpio device + +Required properties: + - compatible = "ps2-gpio" + - data-gpios: the data pin + - clk-gpios: the clock pin + - interrupts: Should trigger on the falling edge of the clock line. + +Optional properties: + - write-enable: Indicates whether write function is provided + to serio device. Possibly providing the write fn will not work, because + of the tough timing requirements. + +Example nodes: + +ps2@0 { + compatible = "ps2-gpio"; + interrupt-parent = <&gpio>; + interrupts = <23 IRQ_TYPE_EDGE_FALLING>; + data-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>; + clk-gpios = <&gpio 23 GPIO_ACTIVE_HIGH>; + write-enable; +}; diff --git a/Documentation/gpio/drivers-on-gpio.txt b/Documentation/gpio/drivers-on-gpio.txt index 306513251713..9a78d385b92e 100644 --- a/Documentation/gpio/drivers-on-gpio.txt +++ b/Documentation/gpio/drivers-on-gpio.txt @@ -84,6 +84,11 @@ hardware descriptions such as device tree or ACPI: NAND flash MTD subsystem and provides chip access and partition parsing like any other NAND driving hardware. +- ps2-gpio: drivers/input/serio/ps2-gpio.c is used to drive a PS/2 (IBM) serio + bus, data and clock line, by bit banging two GPIO lines. It will appear as + any other serio bus to the system and makes it possible to connect drivers + for e.g. keyboards and other PS/2 protocol based devices. + Apart from this there are special GPIO drivers in subsystems like MMC/SD to read card detect and write protect GPIO lines, and in the TTY serial subsystem to emulate MCTRL (modem control) signals CTS/RTS by using two GPIO lines. The |