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@xxxxxxx>
---
.../arm64/boot/dts/rockchip/rk3399-nanopc-t4.dts | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/arch/arm64/boot/dts/rockchip/rk3399-nanopc-t4.dts b/arch/arm64/boot/dts/rockchip/rk3399-nanopc-t4.dts
index 623a03f2548a..84433cf02be9 100644
--- 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 {
--
2.17.1
