lkml.org 
[lkml]   [2011]   [Sep]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/3] gpio-vx855: Add device tree binding
Date
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 <dsd@laptop.org>
---
.../devicetree/bindings/gpio/gpio_vx855.txt | 20 ++++++++++++++++++++
drivers/gpio/gpio-vx855.c | 9 +++++++--
2 files changed, 27 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/gpio/gpio_vx855.txt

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..2c300c9 100644
--- a/drivers/gpio/gpio-vx855.c
+++ b/drivers/gpio/gpio-vx855.c
@@ -201,7 +201,8 @@ static const char *vx855gpio_names[NR_VX855_GP] = {
"VX855_GPIO12", "VX855_GPIO13", "VX855_GPIO14"
};

-static void vx855gpio_gpio_setup(struct vx855_gpio *vg)
+static void vx855gpio_gpio_setup(struct vx855_gpio *vg,
+ struct platform_device *pdev)
{
struct gpio_chip *c = &vg->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 = pdev->dev.of_node;
+#endif
}

/* This platform device is ordinarily registered by the vx855 mfd driver */
@@ -264,7 +269,7 @@ static __devinit int vx855gpio_probe(struct platform_device *pdev)
else
vg->gpo_reserved = true;

- vx855gpio_gpio_setup(vg);
+ vx855gpio_gpio_setup(vg, pdev);

ret = gpiochip_add(&vg->gpio);
if (ret) {
--
1.7.6.2


\
 
 \ /
  Last update: 2011-09-21 14:05    [W:0.046 / U:37.572 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site