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>

1 files changed, 39 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/gpio/gpio-pca953x.txt b/Documentation/devicetree/bindings/gpio/gpio-pca953x.txt
new file mode 100644
index 000000000000..b9a42f294dd0
--- /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>;
+        };