summaryrefslogtreecommitdiffstats
path: root/doc
diff options
context:
space:
mode:
authorGabriel Huau <contact@huau-gabriel.fr>2015-05-25 22:27:37 -0700
committerSimon Glass <sjg@chromium.org>2015-06-04 03:32:08 -0600
commit5318f18d2c002f505054b90bb95ba7c53532eedf (patch)
treec9e25f8c9fc57dbeba19b617f421b6f1ba7ca8d1 /doc
parentafbbd413a3ef8a45155fcd083814ba645b09fcc7 (diff)
downloadu-boot-5318f18d2c002f505054b90bb95ba7c53532eedf.tar.gz
u-boot-5318f18d2c002f505054b90bb95ba7c53532eedf.tar.xz
u-boot-5318f18d2c002f505054b90bb95ba7c53532eedf.zip
x86: gpio: add pinctrl support from the device tree
Every pin can be configured now from the device tree. A dt-bindings has been added to describe the different property available. Change-Id: I1668886062655f83700d0e7bbbe3ad09b19ee975 Signed-off-by: Gabriel Huau <contact@huau-gabriel.fr> Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'doc')
-rw-r--r--doc/device-tree-bindings/gpio/intel,x86-pinctrl.txt31
1 files changed, 31 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/gpio/intel,x86-pinctrl.txt b/doc/device-tree-bindings/gpio/intel,x86-pinctrl.txt
new file mode 100644
index 0000000000..45ab1afc39
--- /dev/null
+++ b/doc/device-tree-bindings/gpio/intel,x86-pinctrl.txt
@@ -0,0 +1,31 @@
+Intel x86 PINCTRL/GPIO controller
+
+Pin-muxing on x86 can be described with a node for the PINCTRL master
+node and a set of child nodes for each pin on the SoC.
+
+The PINCTRL master node requires the following properties:
+- compatible : "intel,x86-pinctrl"
+
+Pin nodes must be children of the pinctrl master node and can
+contain the following properties:
+- pad-offset - (required) offset in the IOBASE for the pin to configured.
+- gpio-offset - (required) offset in the GPIOBASE for the pin to configured and
+ also the bit shift in this register.
+- mode-gpio - (optional) standalone property to force the pin into GPIO mode.
+- mode-func - (optional) function number to assign to the pin. if 'mode-gpio'
+ is set, this property will be ignored.
+in case of 'mode-gpio' property set:
+- output-value - (optional) this set the default output value of the GPIO.
+- direction - (optional) this set the direction of the gpio.
+- pull-str - (optional) this set the pull strength of the pin.
+- pull-assign - (optional) this set the pull assignement (up/down) of the pin.
+
+Example:
+
+pin_usb_host_en0@0 {
+ gpio-offset = <0x80 8>;
+ pad-offset = <0x260>;
+ mode-gpio;
+ output-value = <1>;
+ direction = <PIN_OUTPUT>;
+};