From f17aea430fff4b95ac94e8625096cd82544e9054 Mon Sep 17 00:00:00 2001 From: Quentin Schulz Date: Tue, 5 Dec 2017 15:46:42 +0100 Subject: dt-bindings: gpio: gpio-axp209: add pinctrl features The X-Powers AXP209 has 3 GPIOs. GPIO0/1 can each act either as a GPIO, an ADC or a LDO regulator. GPIO2 can only act as a GPIO. This adds the pinctrl features to the driver so GPIO0/1 can be used as ADC or LDO regulator. Signed-off-by: Quentin Schulz Acked-by: Rob Herring Acked-by: Maxime Ripard Signed-off-by: Linus Walleij --- .../devicetree/bindings/gpio/gpio-axp209.txt | 36 +++++++++++++++++++++- 1 file changed, 35 insertions(+), 1 deletion(-) (limited to 'Documentation/devicetree/bindings/gpio/gpio-axp209.txt') diff --git a/Documentation/devicetree/bindings/gpio/gpio-axp209.txt b/Documentation/devicetree/bindings/gpio/gpio-axp209.txt index a6611304dd3c..0d77597c3f92 100644 --- a/Documentation/devicetree/bindings/gpio/gpio-axp209.txt +++ b/Documentation/devicetree/bindings/gpio/gpio-axp209.txt @@ -1,8 +1,13 @@ -AXP209 GPIO controller +AXP209 GPIO & pinctrl controller This driver follows the usual GPIO bindings found in Documentation/devicetree/bindings/gpio/gpio.txt +This driver follows the usual pinctrl bindings found in +Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt + +This driver employs the per-pin muxing pattern. + Required properties: - compatible: Should be "x-powers,axp209-gpio" - #gpio-cells: Should be two. The first cell is the pin number and the @@ -28,3 +33,32 @@ axp209: pmic@34 { #gpio-cells = <2>; }; }; + +The GPIOs can be muxed to other functions and therefore, must be a subnode of +axp_gpio. + +Example: + +&axp_gpio { + gpio0_adc: gpio0-adc { + pins = "GPIO0"; + function = "adc"; + }; +}; + +&example_node { + pinctrl-names = "default"; + pinctrl-0 = <&gpio0_adc>; +}; + +GPIOs and their functions +------------------------- + +Each GPIO is independent from the other (i.e. GPIO0 in gpio_in function does +not force GPIO1 and GPIO2 to be in gpio_in function as well). + +GPIO | Functions +------------------------ +GPIO0 | gpio_in, gpio_out, ldo, adc +GPIO1 | gpio_in, gpio_out, ldo, adc +GPIO2 | gpio_in, gpio_out -- cgit v1.2.3-59-g8ed1b