[PATCH 31/40] arm64: dts: rockchip: Add frl-enable-gpios to rk3588s-indiedroid-nova

Cristian Ciocaltea
2026-04-17T09:27:59Z

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-indiedroid-nova.dts | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-indiedroid-nova.dts b/arch/arm64/boot/dts/rockchip/rk3588s-indiedroid-nova.dts
index 174d299cc6bb..9a98574ecf7d 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s-indiedroid-nova.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-indiedroid-nova.dts
@@ -278,8 +278,10 @@ &gpu {

&hdmi0 {
pinctrl-0 = <&hdmim0_tx0_scl>, <&hdmim0_tx0_sda>,
- <&hdmim0_tx0_hpd>, <&hdmim0_tx0_cec>;
+ <&hdmim0_tx0_hpd>, <&hdmim0_tx0_cec>,
+ <&hdmi0_frl_en>;
pinctrl-names = "default";
+ frl-enable-gpios = <&gpio4 RK_PB6 GPIO_ACTIVE_LOW>;
status = "okay";
};

@@ -517,6 +519,12 @@ bt_wake_host: bt-wake-host {
};
};

+ hdmi {
+ hdmi0_frl_en: hdmi0-frl-en {
+ rockchip,pins = <4 RK_PB6 RK_FUNC_GPIO &pcfg_pull_none>;
+ };
+ };
+
hym8563 {

hym8563_int: hym8563-int {