ARM: dts: imx7d-sdb: Add GPIO expander node

Add node for U38, a 74LV595PW serial-in shift register that acts as a
GPIO expander on the board.

Cc: yurovsky@gmail.com
Cc: Dong Aisheng <aisheng.dong@nxp.com>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm/boot/dts/imx7d-sdb.dts b/arch/arm/boot/dts/imx7d-sdb.dts
index 5be01a1bf84020e0c999e42f98b7cf32aa0214d4..d6f2dda90710c6c9e1dbb95750beddfdebe27e90 100644 (file)
--- a/arch/arm/boot/dts/imx7d-sdb.dts
+++ b/arch/arm/boot/dts/imx7d-sdb.dts
@@ -52,6 +52,27 @@
                reg = <0x80000000 0x80000000>;
        };
 
+       spi4 {
+               compatible = "spi-gpio";
+               pinctrl-names = "default";
+               pinctrl-0 = <&pinctrl_spi4>;
+               gpio-sck = <&gpio1 13 GPIO_ACTIVE_HIGH>;
+               gpio-mosi = <&gpio1 9 GPIO_ACTIVE_HIGH>;
+               cs-gpios = <&gpio1 12 GPIO_ACTIVE_HIGH>;
+               num-chipselects = <1>;
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               extended_io: gpio-expander@0 {
+                       compatible = "fairchild,74hc595";
+                       gpio-controller;
+                       #gpio-cells = <2>;
+                       reg = <0>;
+                       registers-number = <1>;
+                       spi-max-frequency = <100000>;
+               };
+       };
+
        regulators {
                compatible = "simple-bus";
                #address-cells = <1>;
@@ -642,5 +663,13 @@
                fsl,pins = <
                        MX7D_PAD_LPSR_GPIO1_IO01__PWM1_OUT              0x110b0
                >;
+
+               pinctrl_spi4: spi4grp {
+                       fsl,pins = <
+                               MX7D_PAD_GPIO1_IO09__GPIO1_IO9  0x59
+                               MX7D_PAD_GPIO1_IO12__GPIO1_IO12 0x59
+                               MX7D_PAD_GPIO1_IO13__GPIO1_IO13 0x59
+                       >;
+               };
        };
 };