linux-kernel - Re: [PATCH v4 75/78] dt-bindings: display: vc4: hdmi: Add BCM2711 HDMI controllers bindings

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Message-ID: <94c5b8e4-a168-690d-2d60-93462585bef9@samsung.com>
Date:   Tue, 1 Sep 2020 13:45:07 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Maxime Ripard <maxime@...no.tech>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v4 75/78] dt-bindings: display: vc4: hdmi: Add BCM2711
 HDMI controllers bindings

Hi Maxime,

On 7/9/20 2:42 AM, Maxime Ripard wrote:
> The HDMI controllers found in the BCM2711 SoC need some adjustments to the
> bindings, especially since the registers have been shuffled around in more
> register ranges.
> 
> Reviewed-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
> ---
>  Documentation/devicetree/bindings/display/brcm,bcm2711-hdmi.yaml | 109 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 109 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/brcm,bcm2711-hdmi.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/brcm,bcm2711-hdmi.yaml b/Documentation/devicetree/bindings/display/brcm,bcm2711-hdmi.yaml
> new file mode 100644
> index 000000000000..6091fe3d315b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/brcm,bcm2711-hdmi.yaml
> @@ -0,0 +1,109 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: https://protect2.fireeye.com/url?k=556aeb05-08b8fda0-556b604a-0cc47a31bee8-c3a0ebd1d22c3183&q=1&u=http%3A%2F%2Fdevicetree.org%2Fschemas%2Fdisplay%2Fbrcm%2Cbcm2711-hdmi.yaml%23
> +$schema: https://protect2.fireeye.com/url?k=24fa660c-792870a9-24fbed43-0cc47a31bee8-0bf16f4fd60f0ab4&q=1&u=http%3A%2F%2Fdevicetree.org%2Fmeta-schemas%2Fcore.yaml%23
> +
> +title: Broadcom BCM2711 HDMI Controller Device Tree Bindings
> +
> +maintainers:
> +  - Eric Anholt <eric@...olt.net>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - brcm,bcm2711-hdmi0
> +      - brcm,bcm2711-hdmi1
> +
> +  reg:
> +    items:
> +      - description: HDMI controller register range
> +      - description: DVP register range
> +      - description: HDMI PHY register range
> +      - description: Rate Manager register range
> +      - description: Packet RAM register range
> +      - description: Metadata RAM register range
> +      - description: CSC register range
> +      - description: CEC register range
> +      - description: HD register range
> +
> +  reg-names:
> +    items:
> +      - const: hdmi
> +      - const: dvp
> +      - const: phy
> +      - const: rm
> +      - const: packet
> +      - const: metadata
> +      - const: csc
> +      - const: cec
> +      - const: hd
> +
> +  clocks:
> +    description: The HDMI state machine clock

I'm not sure the following description is correct.
But, this description doesn't contain the information of audio clock.

	description: The HDMI state machine and audio clock

> +
> +  clock-names:
> +    const: hdmi

This patch is missing the following clock information for audio clock.

	const: clk-108M

> +
> +  ddc:
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/phandle
> +    description: >
> +      Phandle of the I2C controller used for DDC EDID probing
> +
> +  hpd-gpios:
> +    description: >
> +      The GPIO pin for the HDMI hotplug detect (if it doesn't appear
> +      as an interrupt/status bit in the HDMI controller itself)
> +
> +  dmas:
> +    maxItems: 1
> +    description: >
> +      Should contain one entry pointing to the DMA channel used to
> +      transfer audio data.
> +
> +  dma-names:
> +    const: audio-rx
> +
> +  resets:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - clocks
> +  - resets
> +  - ddc
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    hdmi0: hdmi@...00700 {
> +        compatible = "brcm,bcm2711-hdmi0";
> +        reg = <0x7ef00700 0x300>,
> +              <0x7ef00300 0x200>,
> +              <0x7ef00f00 0x80>,
> +              <0x7ef00f80 0x80>,
> +              <0x7ef01b00 0x200>,
> +              <0x7ef01f00 0x400>,
> +              <0x7ef00200 0x80>,
> +              <0x7ef04300 0x100>,
> +              <0x7ef20000 0x100>;
> +        reg-names = "hdmi",
> +                    "dvp",
> +                    "phy",
> +                    "rm",
> +                    "packet",
> +                    "metadata",
> +                    "csc",
> +                    "cec",
> +                    "hd";
> +        clocks = <&firmware_clocks 13>;
> +        clock-names = "hdmi";

Also, this example doesn't include the instance of audio clock.
Need to edit them as following:

	clock-names = "hdmi", "clk-108M";
	clocks = <&firmware_clocks 13>, <&dvp 0>;


> +        resets = <&dvp 0>;
> +        ddc = <&ddc0>;
> +    };
> +
> +...
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics