diff options
author | Leela Krishna Amudala <l.krishna@samsung.com> | 2013-06-18 06:58:48 +0900 |
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committer | Kukjin Kim <kgene.kim@samsung.com> | 2013-06-18 06:58:48 +0900 |
commit | c91f2a03cfc67753c8ab78f97983e947bb8f7610 (patch) | |
tree | 09371dc24c9f99e249f5d6b17f1cba47196ca8b2 /Documentation | |
parent | de39310ddfa7f999e51961b8cf6b15332af0c525 (diff) |
Documentation: Add examples to samsung-pinctrl device tree bindings documentation
This patch adds examples to samsung-pinctrl.txt documentaion file
on how to make gpio binding and gpio request
Signed-off-by: Leela Krishna Amudala <l.krishna@samsung.com>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt | 44 |
1 files changed, 42 insertions, 2 deletions
diff --git a/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt index c70fca146e91..e15cfc4bb39e 100644 --- a/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt +++ b/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt @@ -21,8 +21,18 @@ Required Properties: - gpio-controller: identifies the node as a gpio controller and pin bank. - #gpio-cells: number of cells in GPIO specifier. Since the generic GPIO - binding is used, the amount of cells must be specified as 2. See generic - GPIO binding documentation for description of particular cells. + binding is used, the amount of cells must be specified as 2. See the below + mentioned gpio binding representation for description of particular cells. + + Eg: <&gpx2 6 0> + <[phandle of the gpio controller node] + [pin number within the gpio controller] + [flags]> + + Values for gpio specifier: + - Pin number: is a value between 0 to 7. + - Flags: 0 - Active High + 1 - Active Low - Pin mux/config groups as child nodes: The pin mux (selecting pin function mode) and pin config (pull up/down, driver strength) settings are represented @@ -266,3 +276,33 @@ Example 4: Set up the default pin state for uart controller. pinctrl = devm_pinctrl_get_select_default(&pdev->dev); } + +Example 5: A display port client node that supports 'default' pinctrl state + and gpio binding. + + display-port-controller { + /* ... */ + + samsung,hpd-gpio = <&gpx2 6 0>; + pinctrl-names = "default"; + pinctrl-0 = <&dp_hpd>; + }; + +Example 6: Request the gpio for display port controller + + static int exynos_dp_probe(struct platform_device *pdev) + { + int hpd_gpio, ret; + struct device *dev = &pdev->dev; + struct device_node *dp_node = dev->of_node; + + /* ... */ + + hpd_gpio = of_get_named_gpio(dp_node, "samsung,hpd-gpio", 0); + + /* ... */ + + ret = devm_gpio_request_one(&pdev->dev, hpd_gpio, GPIOF_IN, + "hpd_gpio"); + /* ... */ + } |