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| author | Thomas Chou <thomas@wytron.com.tw> | 2015-10-21 21:33:45 +0800 |
|---|---|---|
| committer | Thomas Chou <thomas@wytron.com.tw> | 2015-10-23 07:37:03 +0800 |
| commit | 88d5ecf4b9c0d5a3bff5d6d98ab7383a550a57db (patch) | |
| tree | 599e4aee08402b27726c8ae80c86a90d44d8220a /doc | |
| parent | d21275ef5e7fe67c592896d6dbb157e219ec0450 (diff) | |
nios2 : convert altera_pio to driver model
Convert altera_pio to driver model.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Chin Liang See <clsee@altera.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/device-tree-bindings/gpio/altera_pio.txt | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/gpio/altera_pio.txt b/doc/device-tree-bindings/gpio/altera_pio.txt new file mode 100644 index 0000000000..cf71eb2824 --- /dev/null +++ b/doc/device-tree-bindings/gpio/altera_pio.txt @@ -0,0 +1,28 @@ +Altera GPIO controller bindings + +Required properties: +- compatible: + - "altr,pio-1.0" +- reg: Physical base address and length of the controller's registers. + +Optional properties: +- altr,gpio-bank-width: Width of the GPIO bank. This defines how many pins the + GPIO device has. Ranges between 1-32. Optional and defaults to 32 if not + specified. +- gpio-bank-name: bank name attached to this device. + +Example: + +user_led_pio_8out: gpio@0x4cc0 { + compatible = "altr,pio-1.0"; + reg = <0x00004cc0 0x00000010>; + resetvalue = <255>; + altr,gpio-bank-width = <8>; + #gpio-cells = <2>; + gpio-controller; + gpio-bank-name = "led"; +}; + +In this example, the gpio can be accessed as led[0..7] using gpio command of +u-boot. +==> gpio clear led0 |