Enable CEC on rk3399-firefly on mainline

gistfile1.txt

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-firefly.dts b/arch/arm64/boot/dts/rockchip/rk3399-firefly.dts
index f6fbcc05073e..da373ddad74b 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-firefly.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-firefly.dts
@@ -257,6 +261,8 @@
 
 &hdmi {
 	ddc-i2c-bus = <&i2c3>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&hdmi_cec>;
 	status = "okay";
 };
 
diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
index ab7629c5b856..a65f7f744a40 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
@@ -1601,8 +1601,12 @@
 		compatible = "rockchip,rk3399-dw-hdmi";
 		reg = <0x0 0xff940000 0x0 0x20000>;
 		interrupts = <GIC_SPI 23 IRQ_TYPE_LEVEL_HIGH 0>;
-		clocks = <&cru PCLK_HDMI_CTRL>, <&cru SCLK_HDMI_SFR>, <&cru PLL_VPLL>, <&cru PCLK_VIO_GRF>;
-		clock-names = "iahb", "isfr", "vpll", "grf";
+		clocks = <&cru PCLK_HDMI_CTRL>,
+			 <&cru SCLK_HDMI_SFR>,
+			 <&cru PLL_VPLL>,
+			 <&cru PCLK_VIO_GRF>,
+			 <&cru SCLK_HDMI_CEC>;
+		clock-names = "iahb", "isfr", "vpll", "grf", "cec";
 		power-domains = <&power RK3399_PD_HDCP>;
 		reg-io-width = <4>;
 		rockchip,grf = <&grf>;
diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index 1eb02a82fd91..417f82483f9d 100644
--- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
@@ -48,6 +48,7 @@ struct rockchip_hdmi {
 	const struct rockchip_hdmi_chip_data *chip_data;
 	struct clk *vpll_clk;
 	struct clk *grf_clk;
+	struct clk *cec_clk;
 };
 
 #define to_rockchip_hdmi(x)	container_of(x, struct rockchip_hdmi, x)
@@ -182,6 +183,12 @@ static int rockchip_hdmi_parse_dt(struct rockchip_hdmi *hdmi)
 		return PTR_ERR(hdmi->vpll_clk);
 	}
 
+	hdmi->cec_clk = devm_clk_get(hdmi->dev, "cec");
+	if (!IS_ERR(hdmi->cec_clk)) {
+		clk_prepare_enable(hdmi->cec_clk);
+	}
+
+
 	hdmi->grf_clk = devm_clk_get(hdmi->dev, "grf");
 	if (PTR_ERR(hdmi->grf_clk) == -ENOENT) {
 		hdmi->grf_clk = NULL;