gpio: pca953x: Add DT binding documentation

Add a devicetree binding documentation for the pca953x driver.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/Documentation/devicetree/bindings/gpio/gpio-pca953x.txt b/Documentation/devicetree/bindings/gpio/gpio-pca953x.txt
new file mode 100644 (file)
index 0000000..b9a42f2
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-pca953x.txt
@@ -0,0 +1,39 @@
+* NXP PCA953x I2C GPIO multiplexer
+
+Required properties:
+ - compatible: Has to contain one of the following:
+       nxp,pca9505
+       nxp,pca9534
+       nxp,pca9535
+       nxp,pca9536
+       nxp,pca9537
+       nxp,pca9538
+       nxp,pca9539
+       nxp,pca9554
+       nxp,pca9555
+       nxp,pca9556
+       nxp,pca9557
+       nxp,pca9574
+       nxp,pca9575
+       nxp,pca9698
+       maxim,max7310
+       maxim,max7312
+       maxim,max7313
+       maxim,max7315
+       ti,pca6107
+       ti,tca6408
+       ti,tca6416
+       ti,tca6424
+       exar,xra1202
+
+Example:
+
+
+       gpio@20 {
+               compatible = "nxp,pca9505";
+               reg = <0x20>;
+               pinctrl-names = "default";
+               pinctrl-0 = <&pinctrl_pca9505>;
+               interrupt-parent = <&gpio3>;
+               interrupts = <23 IRQ_TYPE_LEVEL_LOW>;
+       };