Re: [PATCH v4 2/4] dt-bindings: media: Document bindings for HDMI RX Controller

[Johan Jonker <jbx6244@yandex.com>]

On 7/19/24 14:40, Shreeya Patel wrote:
> Document bindings for the Synopsys DesignWare HDMI RX Controller.
> 
> Reviewed-by: Rob Herring <robh@kernel.org>
> Reviewed-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
> Signed-off-by: Shreeya Patel <shreeya.patel@collabora.com>
> ---
> 
> Changes in v4 :-
>   - No change
> 
> Changes in v3 :-
>   - Rename hdmirx_cma to hdmi_receiver_cma
>   - Add a Reviewed-by tag
> 
> Changes in v2 :-
>   - Add a description for the hardware
>   - Rename resets, vo1 grf and HPD properties
>   - Add a proper description for grf and vo1-grf phandles
>   - Rename the HDMI Input node name to hdmi-receiver
>   - Improve the subject line
>   - Include gpio header file in example to fix dt_binding_check failure
> 
>  .../bindings/media/snps,dw-hdmi-rx.yaml       | 132 ++++++++++++++++++
>  1 file changed, 132 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml b/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml
> new file mode 100644
> index 000000000000..96ae1e2d2816
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml
> @@ -0,0 +1,132 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Device Tree bindings for Synopsys DesignWare HDMI RX Controller
> +
> +---
> +$id: http://devicetree.org/schemas/media/snps,dw-hdmi-rx.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Synopsys DesignWare HDMI RX Controller
> +
> +maintainers:
> +  - Shreeya Patel <shreeya.patel@collabora.com>
> +
> +description:
> +  Synopsys DesignWare HDMI Input Controller preset on RK3588 SoCs
> +  allowing devices to receive and decode high-resolution video streams
> +  from external sources like media players, cameras, laptops, etc.
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: rockchip,rk3588-hdmirx-ctrler

> +      - const: snps,dw-hdmi-rx

1: Compatible strings must be SoC orientated.
2: In Linux there's no priority in which string will probed first. 
What's the point of having a fallback string when there's no common code, but instead only the first string is used?

+static const struct of_device_id hdmirx_id[] = {
+	{ .compatible = "rockchip,rk3588-hdmirx-ctrler" },
+	{ },
+};

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 3
> +
> +  interrupt-names:
> +    items:
> +      - const: cec
> +      - const: hdmi
> +      - const: dma
> +
> +  clocks:
> +    maxItems: 7
> +
> +  clock-names:
> +    items:
> +      - const: aclk
> +      - const: audio
> +      - const: cr_para
> +      - const: pclk
> +      - const: ref
> +      - const: hclk_s_hdmirx
> +      - const: hclk_vo1
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 4
> +
> +  reset-names:
> +    items:
> +      - const: axi
> +      - const: apb
> +      - const: ref
> +      - const: biu
> +
> +  memory-region:
> +    maxItems: 1
> +
> +  hpd-gpios:
> +    description: GPIO specifier for HPD.
> +    maxItems: 1
> +
> +  rockchip,grf:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      The phandle of the syscon node for the general register file
> +      containing HDMIRX PHY status bits.
> +
> +  rockchip,vo1-grf:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      The phandle of the syscon node for the Video Output GRF register
> +      to enable EDID transfer through SDAIN and SCLIN.
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - interrupt-names
> +  - clocks
> +  - clock-names
> +  - power-domains
> +  - resets
> +  - pinctrl-0
> +  - hpd-gpios
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/rockchip,rk3588-cru.h>
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/power/rk3588-power.h>
> +    #include <dt-bindings/reset/rockchip,rk3588-cru.h>
> +    hdmi_receiver: hdmi-receiver@fdee0000 {
> +      compatible = "rockchip,rk3588-hdmirx-ctrler", "snps,dw-hdmi-rx";
> +      reg = <0xfdee0000 0x6000>;
> +      interrupts = <GIC_SPI 177 IRQ_TYPE_LEVEL_HIGH 0>,
> +                   <GIC_SPI 436 IRQ_TYPE_LEVEL_HIGH 0>,
> +                   <GIC_SPI 179 IRQ_TYPE_LEVEL_HIGH 0>;
> +      interrupt-names = "cec", "hdmi", "dma";
> +      clocks = <&cru ACLK_HDMIRX>,
> +               <&cru CLK_HDMIRX_AUD>,
> +               <&cru CLK_CR_PARA>,
> +               <&cru PCLK_HDMIRX>,
> +               <&cru CLK_HDMIRX_REF>,
> +               <&cru PCLK_S_HDMIRX>,
> +               <&cru HCLK_VO1>;
> +      clock-names = "aclk",
> +                    "audio",
> +                    "cr_para",
> +                    "pclk",
> +                    "ref",
> +                    "hclk_s_hdmirx",
> +                    "hclk_vo1";
> +      power-domains = <&power RK3588_PD_VO1>;
> +      resets = <&cru SRST_A_HDMIRX>, <&cru SRST_P_HDMIRX>,
> +               <&cru SRST_HDMIRX_REF>, <&cru SRST_A_HDMIRX_BIU>;
> +      reset-names = "axi", "apb", "ref", "biu";
> +      memory-region = <&hdmi_receiver_cma>;
> +      pinctrl-0 = <&hdmim1_rx_cec &hdmim1_rx_hpdin &hdmim1_rx_scl &hdmim1_rx_sda &hdmirx_5v_detection>;
> +      pinctrl-names = "default";
> +      hpd-gpios = <&gpio1 22 GPIO_ACTIVE_LOW>;
> +    };