[PATCH 21/27] arm64: dts: rockchip: rk356x: Add HDMI nodes

[Peter Geis]

On Wed, Jan 26, 2022 at 9:58 AM Sascha Hauer <s.hauer at pengutronix.de> wrote:
>
> Add support for the HDMI port found on RK3568.
>
> Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
> ---
>  arch/arm64/boot/dts/rockchip/rk356x.dtsi | 37 +++++++++++++++++++++++-
>  1 file changed, 36 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/rockchip/rk356x.dtsi b/arch/arm64/boot/dts/rockchip/rk356x.dtsi
> index 4008bd666d01..e38fb223e9b8 100644
> --- a/arch/arm64/boot/dts/rockchip/rk356x.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk356x.dtsi
> @@ -10,7 +10,6 @@
>  #include <dt-bindings/pinctrl/rockchip.h>
>  #include <dt-bindings/power/rk3568-power.h>
>  #include <dt-bindings/soc/rockchip,boot-mode.h>
> -#include <dt-bindings/soc/rockchip,vop2.h>
>  #include <dt-bindings/thermal/thermal.h>
>
>  / {
> @@ -502,6 +501,42 @@ vop_mmu: iommu at fe043e00 {
>                 status = "disabled";
>         };
>
> +       hdmi: hdmi at fe0a0000 {
> +               compatible = "rockchip,rk3568-dw-hdmi";
> +               reg = <0x0 0xfe0a0000 0x0 0x20000>;
> +               interrupts = <GIC_SPI 45 IRQ_TYPE_LEVEL_HIGH>;
> +               clocks = <&cru PCLK_HDMI_HOST>,
> +                        <&cru CLK_HDMI_SFR>,
> +                        <&cru CLK_HDMI_CEC>,
> +                        <&pmucru CLK_HDMI_REF>,
> +                        <&cru HCLK_VOP>;
> +               clock-names = "iahb", "isfr", "cec", "ref", "hclk";
> +               pinctrl-names = "default";
> +               pinctrl-0 = <&hdmitx_scl &hdmitx_sda &hdmitxm0_cec>;

I looked into CEC support here, and it seems that it does work with one change.
Please add the two following lines to your patch:
assigned-clocks = <&cru CLK_HDMI_CEC>;
assigned-clock-rates = <32768>;

The issue is the clk_rtc32k_frac clock that feeds clk_rtc_32k which
feeds clk_hdmi_cec is 24mhz at boot, which is too high for CEC to
function.

> +               power-domains = <&power RK3568_PD_VO>;
> +               reg-io-width = <4>;
> +               rockchip,grf = <&grf>;
> +               #sound-dai-cells = <0>;
> +               status = "disabled";
> +
> +               ports {
> +                       #address-cells = <1>;
> +                       #size-cells = <0>;
> +
> +                       hdmi_in: port at 0 {
> +                               reg = <0>;
> +                               #address-cells = <1>;
> +                               #size-cells = <0>;
> +                       };
> +
> +                       hdmi_out: port at 1 {
> +                               reg = <1>;
> +                               #address-cells = <1>;
> +                               #size-cells = <0>;
> +                       };
> +               };
> +       };
> +
>         qos_gpu: qos at fe128000 {
>                 compatible = "rockchip,rk3568-qos", "syscon";
>                 reg = <0x0 0xfe128000 0x0 0x20>;
> --
> 2.30.2
>