This is needed to enable the HDD LED on the OLPC XO-1.5 laptop, enabled through devicetree and the gpio-leds driver.
Signed-off-by: Daniel Drake <d...@laptop.org> --- .../devicetree/bindings/gpio/gpio_vx855.txt | 20 ++++++++++++++++++++ drivers/gpio/gpio-vx855.c | 5 +++++ 2 files changed, 25 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/gpio/gpio_vx855.txt v2: extended the documentation with information about the pin numbering scheme, which matches that of the driver. diff --git a/Documentation/devicetree/bindings/gpio/gpio_vx855.txt b/Documentation/devicetree/bindings/gpio/gpio_vx855.txt new file mode 100644 index 0000000..17285a5 --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio_vx855.txt @@ -0,0 +1,20 @@ +VIA VX855 GPIO controller + +Required properties: +- compatible : "via,vx855-gpio" +- #gpio-cells : Should be two. The first cell is the pin number and the + second cell is used to specify optional parameters: + - bit 0 specifies polarity (0 for normal, 1 for inverted) +- gpio-controller : Marks the device node as a GPIO controller. + +As VIA differentiates between GPI, GPO and GPIO on its 42 available pins, +with each pin type restarting numbering at 0, the following numbering scheme +is used in the device tree for the pin number: + +PIN NO VIA NAME +0..13 GPI 0..13 +14..26 GPO 0..12 +27..41 GPIO 0..14 + +For example, GPIO 11 (VIA name) is referred to with pin number 38 in the +device tree. diff --git a/drivers/gpio/gpio-vx855.c b/drivers/gpio/gpio-vx855.c index ef5aabd..5b7e9ba 100644 --- a/drivers/gpio/gpio-vx855.c +++ b/drivers/gpio/gpio-vx855.c @@ -31,6 +31,7 @@ #include <linux/platform_device.h> #include <linux/pci.h> #include <linux/io.h> +#include <linux/of.h> #define MODULE_NAME "vx855_gpio" @@ -216,6 +217,10 @@ static void vx855gpio_gpio_setup(struct vx855_gpio *vg) c->ngpio = NR_VX855_GP; c->can_sleep = 0; c->names = vx855gpio_names; + +#ifdef CONFIG_OF_GPIO + c->of_node = of_find_compatible_node(NULL, NULL, "via,vx855-gpio"); +#endif } /* This platform device is ordinarily registered by the vx855 mfd driver */ -- 1.7.6 _______________________________________________ devicetree-discuss mailing list devicetree-discuss@lists.ozlabs.org https://lists.ozlabs.org/listinfo/devicetree-discuss