dt-bindings: pinctrl: mcp23s08 update binding doc

The mcp23s08 driver moved to pinctrl recently. It accepts the
bias-pull-up pinctrl property since then. This updates the binding
doc to reflect that.

Thanks to Sebastian Reichel for the working example.

Signed-off-by: Lars Poeschel <poeschel@lemonage.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt
index c934106..b7a0e86 100644 (file)
--- a/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt
@@ -81,3 +81,61 @@ gpiom1: gpio@0 {
         reg = <0>;
         spi-max-frequency = <1000000>;
 };
+
+Pull-up configuration
+=====================
+
+If pins are used as output, they can also be configured with pull-ups. This is
+done with pinctrl.
+
+Please refer file <devicetree/bindings/pinctrl/pinctrl-bindings.txt>
+for details of the common pinctrl bindings used by client devices,
+including the meaning of the phrase "pin configuration node".
+
+Optional Pinmux properties:
+--------------------------
+Following properties are required if default setting of pins are required
+at boot.
+- pinctrl-names: A pinctrl state named per <pinctrl-binding.txt>.
+- pinctrl[0...n]: Properties to contain the phandle for pinctrl states per
+               <pinctrl-binding.txt>.
+
+The pin configurations are defined as child of the pinctrl states node. Each
+sub-node have following properties:
+
+Required properties:
+------------------
+- pins: List of pins. Valid values of pins properties are:
+                     gpio0 ... gpio7 for the devices with 8 GPIO pins and
+                     gpio0 ... gpio15 for the devices with 16 GPIO pins.
+
+Optional properties:
+-------------------
+The following optional property is defined in the pinmux DT binding document
+<pinctrl-bindings.txt>. Absence of this property will leave the configuration
+in its default state.
+       bias-pull-up
+
+Example with pinctrl to pull-up output pins:
+gpio21: gpio@21 {
+       compatible = "microchip,mcp23017";
+       gpio-controller;
+       #gpio-cells = <0x2>;
+       reg = <0x21>;
+       interrupt-parent = <&socgpio>;
+       interrupts = <0x17 0x8>;
+       interrupt-names = "mcp23017@21 irq";
+       interrupt-controller;
+       #interrupt-cells = <0x2>;
+       microchip,irq-mirror;
+       pinctrl-names = "default";
+       pinctrl-0 = <&i2cgpio0irq &gpio21pullups>;
+
+       gpio21pullups: pinmux {
+               pins =  "gpio0", "gpio1", "gpio2", "gpio3",
+                       "gpio4", "gpio5", "gpio6", "gpio7",
+                       "gpio8", "gpio9", "gpio10", "gpio11",
+                       "gpio12", "gpio13", "gpio14", "gpio15";
+               bias-pull-up;
+       };
+};