pinctrl: add DT bindings for lpc1850-scu pinctrl driver

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/Documentation/devicetree/bindings/pinctrl/nxp,lpc1850-scu.txt b/Documentation/devicetree/bindings/pinctrl/nxp,lpc1850-scu.txt
new file mode 100644 (file)
index 0000000..df0309c
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+++ b/Documentation/devicetree/bindings/pinctrl/nxp,lpc1850-scu.txt
@@ -0,0 +1,57 @@
+NXP LPC18xx/43xx SCU pin controller Device Tree Bindings
+--------------------------------------------------------
+
+Required properties:
+- compatible           : Should be "nxp,lpc1850-scu"
+- reg                  : Address and length of the register set for the device
+- clocks               : Clock specifier (see clock bindings for details)
+
+The lpc1850-scu driver uses the generic pin multiplexing and generic pin
+configuration documented in pinctrl-bindings.txt.
+
+The following generic nodes are supported:
+ - function
+ - pins
+ - bias-disable
+ - bias-pull-up
+ - bias-pull-down
+ - drive-strength
+ - input-enable
+ - input-disable
+ - input-schmitt-enable
+ - input-schmitt-disable
+ - slew-rate
+
+Not all pins support all properties so either refer to the NXP 1850/4350
+user manual or the pin table in the pinctrl-lpc18xx driver for supported
+pin properties.
+
+Example:
+pinctrl: pinctrl@40086000 {
+       compatible = "nxp,lpc1850-scu";
+       reg = <0x40086000 0x1000>;
+       clocks = <&ccu1 CLK_CPU_SCU>;
+
+       i2c0_pins: i2c0-pins {
+               i2c0_pins_cfg {
+                       pins = "i2c0_scl", "i2c0_sda";
+                       function = "i2c0";
+                       input-enable;
+               };
+       };
+
+       uart0_pins: uart0-pins {
+               uart0_rx_cfg {
+                       pins = "pf_11";
+                       function = "uart0";
+                       bias-disable;
+                       input-enable;
+               };
+
+               uart0_tx_cfg {
+                       pins = "pf_10";
+                       function = "uart0";
+                       bias-disable;
+               };
+       };
+};