linux-kernel - Re: [PATCH v2 01/14] dt-bindings: phy: Add MIPI CSI PHY for i.MX8Q

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Message-ID: <20250206211808.GA24886@pendragon.ideasonboard.com>
Date: Thu, 6 Feb 2025 23:18:08 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Frank Li <Frank.Li@....com>
Cc: Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Rui Miguel Silva <rmfrfs@...il.com>,
	Martin Kepplinger <martink@...teo.de>,
	Purism Kernel Team <kernel@...i.sm>, linux-phy@...ts.infradead.org,
	devicetree@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org, "Guoniu.zhou" <guoniu.zhou@....com>,
	Robby Cai <robby.cai@....com>,
	Robert Chiras <robert.chiras@....com>
Subject: Re: [PATCH v2 01/14] dt-bindings: phy: Add MIPI CSI PHY for i.MX8Q

Hi Frank,

Thank you for the patch.

On Wed, Feb 05, 2025 at 12:18:10PM -0500, Frank Li wrote:
> Add MIPI CSI phy binding doc for i.MX8QXP, i.MX8QM and i.MX8ULP.

s/CSI/CSI-2/ in the subject line, here and below.
s/phy/PHY/

> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
> change from v1 to v2
> - Add missed fsl,imx8qm-mipi-cphy, which failback to fsl,imx8qxp-mipi-cphy
> - Move reg to required. Previous 8ulp use fsl,offset in downstream version.
> which should be reg. So move it to required
> ---
>  .../bindings/phy/fsl,imx8qxp-mipi-cphy.yaml        | 57 ++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/phy/fsl,imx8qxp-mipi-cphy.yaml b/Documentation/devicetree/bindings/phy/fsl,imx8qxp-mipi-cphy.yaml
> new file mode 100644
> index 0000000000000..7335b9262d0e7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/fsl,imx8qxp-mipi-cphy.yaml
> @@ -0,0 +1,57 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/fsl,imx8qxp-mipi-cphy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale i.MX8 SoC MIPI CSI PHY
> +
> +maintainers:
> +  - Frank Li <Frank.Li@....com>
> +
> +properties:
> +  "#phy-cells":
> +    const: 0
> +
> +  compatible:
> +    oneOf:
> +      - enum:
> +          - fsl,imx8qxp-mipi-cphy
> +          - fsl,imx8ulp-mipi-cphy
> +      - items:
> +          - const: fsl,imx8qm-mipi-cphy
> +          - const: fsl,imx8qxp-mipi-cphy

Why are those called cphy when, as far as I can tell from the
documentation, they are D-PHYs ? Does that stand for *C*SI PHY ? I find
it slightly confusing, but not so much that I'd ask for a change. It's
just a name at the end of the day.

Apart from that the binding looks fairly OK. Except maybe from the fact
that this device is not a PHY :-( It has two PHY control registers, but
the rest seems related to the glue logic at the output of the CSI-2
receiver. I wonder if we should go the syscon route.

> +
> +  reg:
> +    maxItems: 1
> +
> +  power-domains:
> +    maxItems: 1
> +
> +required:
> +  - "#phy-cells"
> +  - compatible
> +  - reg
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - fsl,imx8qxp-mipi-cphy
> +    then:
> +      required:
> +        - power-domains
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    phy@...21000 {
> +            compatible = "fsl,imx8qxp-mipi-cphy";
> +            reg = <0x58221000 0x10000>;
> +            #phy-cells = <0>;
> +            power-domains = <&pd 0>;
> +    };
> +

-- 
Regards,

Laurent Pinchart