[PATCH 08/40] arm64: dts: rockchip: Add frl-enable-gpios to rk3576-roc-pc

[Cristian Ciocaltea]

The board exposes the GPIO2_B0 line to control the voltage bias on the
HDMI data lines.  It must be asserted when operating in HDMI 2.1 FRL
mode and deasserted for HDMI 1.4/2.0 TMDS mode.

Wire up the HDMI node to the GPIO line using the frl-enable-gpios
property to allow adjusting the bias when transitioning between TMDS and
FRL operating modes.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxxxxxx>
---
 arch/arm64/boot/dts/rockchip/rk3576-roc-pc.dts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3576-roc-pc.dts b/arch/arm64/boot/dts/rockchip/rk3576-roc-pc.dts
index d0ab1d1e0e11..68f9911bf4d4 100644
--- a/arch/arm64/boot/dts/rockchip/rk3576-roc-pc.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3576-roc-pc.dts
@@ -283,6 +283,8 @@ &eth0m0_rgmii_bus
 };
 
 &hdmi {
+	pinctrl-0 = <&hdmi_txm0_pins &hdmi_tx_scl &hdmi_tx_sda &hdmi_frl_en>;
+	frl-enable-gpios = <&gpio2 RK_PB0 GPIO_ACTIVE_LOW>;
 	status = "okay";
 };
 
@@ -720,6 +722,12 @@ &sdmmc {
 };
 
 &pinctrl {
+	hdmi {
+		hdmi_frl_en: hdmi-frl-en {
+			rockchip,pins = <2 RK_PB0 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
 	hym8563 {
 		rtc_int_l: rtc-int-l {
 			rockchip,pins = <0 RK_PA0 RK_FUNC_GPIO &pcfg_pull_up>;

-- 
2.53.0