arm64: dts: rockchip: Add NanoPC-T4 IR receiver

In common with most Rockchip reference designs, NanoPC-T4 has a passive
IR receiver connected to PWM3. In lieu of a specialised driver for
PWM-based IR pulse measurement, running the pin as a GPIO with the basic
driver works perfectly well.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-nanopc-t4.dts b/arch/arm64/boot/dts/rockchip/rk3399-nanopc-t4.dts
index 623a03f..84433cf 100644 (file)
--- a/arch/arm64/boot/dts/rockchip/rk3399-nanopc-t4.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-nanopc-t4.dts
@@ -45,6 +45,22 @@
                        press-threshold-microvolt = <18000>;
                };
        };
+
+       ir-receiver {
+               compatible = "gpio-ir-receiver";
+               gpios = <&gpio0 RK_PA6 GPIO_ACTIVE_LOW>;
+               pinctrl-names = "default";
+               pinctrl-0 = <&ir_rx>;
+       };
+};
+
+&pinctrl {
+       ir {
+               ir_rx: ir-rx {
+                       /* external pullup to VCC3V3_SYS, despite being 1.8V :/ */
+                       rockchip,pins = <0 RK_PA6 RK_FUNC_1 &pcfg_pull_none>;
+               };
+       };
 };
 
 &sdhci {