[PATCH v4] ARM: dts: imx6qdl-rex: add gpio expander pca9535

[Gilles DOFFE]

The pca9535 gpio expander is present on the Rex baseboard, but missing
from the dtsi.
The pca9535 is on i2c2 bus which is common to the three SOM
variants (Basic/Pro/Ultra), thus it is activated by default.

Add also the new gpio controller and the associated interrupt line
MX6QDL_PAD_NANDF_CS3__GPIO6_IO16.

Signed-off-by: Gilles DOFFE <gilles.doffe@xxxxxxxxxxxxxxxxxxxx>
---
 arch/arm/boot/dts/imx6qdl-rex.dtsi | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/arm/boot/dts/imx6qdl-rex.dtsi b/arch/arm/boot/dts/imx6qdl-rex.dtsi
index 97f1659144ea..305b57fadc60 100644
--- a/arch/arm/boot/dts/imx6qdl-rex.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-rex.dtsi
@@ -132,6 +132,19 @@
 	pinctrl-0 = <&pinctrl_i2c2>;
 	status = "okay";
 
+	pca9535: gpio-expander@27 {
+		compatible = "nxp,pca9535";
+		reg = <0x27>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_pca9535>;
+		interrupt-parent = <&gpio6>;
+		interrupts = <16 IRQ_TYPE_LEVEL_LOW>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+	};
+
 	eeprom@57 {
 		compatible = "atmel,24c02";
 		reg = <0x57>;
@@ -237,6 +250,12 @@
 			>;
 		};
 
+		pinctrl_pca9535: pca9535 {
+			fsl,pins = <
+				MX6QDL_PAD_NANDF_CS3__GPIO6_IO16	0x17059
+		   >;
+		};
+
 		pinctrl_uart1: uart1grp {
 			fsl,pins = <
 				MX6QDL_PAD_CSI0_DAT10__UART1_TX_DATA	0x1b0b1
-- 
2.20.1