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

Cristian Ciocaltea
2026-04-17T09:28:00Z

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@collabora.com>
---
arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts b/arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts
index 7fe42f4ff827..8ffbbc5f9b6c 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts
@@ -262,7 +262,9 @@ &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";
};

@@ -461,6 +463,12 @@ &pd_gpu {
};

&pinctrl {
+ hdmi {
+ hdmi0_frl_en: hdmi0-frl-en {
+ rockchip,pins = <4 RK_PB6 RK_FUNC_GPIO &pcfg_pull_none>;
+ };
+ };
+
leds {
led_pins: led-pins {
rockchip,pins = <3 RK_PC4 RK_FUNC_GPIO &pcfg_pull_none>,

--
2.53.0