[PATCH 39/40] arm64: dts: rockchip: Add frl-enable-gpios to rk3588s-rock-5a

[Cristian Ciocaltea]

The board exposes the GPIO4_B6 line to control the voltage bias on the
HDMI0 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 HDMI0 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 at collabora.com>
---
 arch/arm64/boot/dts/rockchip/rk3588s-rock-5a.dts | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-rock-5a.dts b/arch/arm64/boot/dts/rockchip/rk3588s-rock-5a.dts
index 0991f6a21190..b3afbdd7119d 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s-rock-5a.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-rock-5a.dts
@@ -327,7 +327,9 @@ &hdmi0 {
 	pinctrl-0 = <&hdmim0_tx0_cec
 		     &hdmim1_tx0_hpd
 		     &hdmim0_tx0_scl
-		     &hdmim0_tx0_sda>;
+		     &hdmim0_tx0_sda
+		     &hdmi0_frl_en>;
+	frl-enable-gpios = <&gpio4 RK_PB6 GPIO_ACTIVE_LOW>;
 	status = "okay";
 };
 
@@ -373,6 +375,12 @@ &pd_gpu {
 };
 
 &pinctrl {
+	hdmi {
+		hdmi0_frl_en: hdmi0-frl-en {
+			rockchip,pins = <4 RK_PB6 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
 	leds {
 		io_led: io-led {
 			rockchip,pins = <3 RK_PD5 RK_FUNC_GPIO &pcfg_pull_none>;

-- 
2.53.0