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

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Message-ID: <Z6I4jZW42ZkSYFJ7@lizhi-Precision-Tower-5810>
Date: Tue, 4 Feb 2025 10:55:57 -0500
From: Frank Li <Frank.li@....com>
To: Rob Herring <robh@...nel.org>
Cc: Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...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>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	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 01/14] dt-bindings: phy: Add MIPI CSI PHY for i.MX8Q

On Mon, Feb 03, 2025 at 04:02:30PM -0600, Rob Herring wrote:
> On Fri, Jan 31, 2025 at 04:33:46PM -0500, Frank Li wrote:
> > Add MIPI CSI phy binding doc for i.MX8QXP, i.MX8QM and i.MX8ULP.
> >
> > Signed-off-by: Frank Li <Frank.Li@....com>
> > ---
> >  .../bindings/phy/fsl,imx8qxp-mipi-cphy.yaml        | 53 ++++++++++++++++++++++
> >  1 file changed, 53 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..c6cbedd9ed114
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/phy/fsl,imx8qxp-mipi-cphy.yaml
> > @@ -0,0 +1,53 @@
> > +# 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:
> > +    enum:
> > +      - fsl,imx8qxp-mipi-cphy
> > +      - fsl,imx8ulp-mipi-cphy
>
> Where's imx8qm?

Sorry, missed. dts use fsl,imx8qxp-mipi-cphy at 8qm, so I have not found it
by DTB_CHECK.

>
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  power-domains:
> > +    maxItems: 1
> > +
> > +required:
> > +  - "#phy-cells"
> > +  - compatible
> > +
> > +allOf:
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            enum:
> > +              - fsl,imx8qxp-mipi-cphy
> > +    then:
> > +      required:
> > +        - reg
>
> How is the device accessed with no registers?

8ulp boudle other function's register.

csr_regs: csr@...d0000 {
	compatible = "8upl-csr", "syscon", "simple-mfd";
        reg = <0x2dad0000 0x10000>;
        clocks = <&pcc5 IMX8ULP_CLK_CSI_REGS>;

        csr_regs_rst: reset-controller {
        	compatible = "nxp,imx8ulp-csr-regs-reset";
		...
        };

	mipi-phy {
		compatible = "fsl,imx8ulp-mipi-cphy";
		...
	};
};

I have not 8ulp to do test now and this serial are already quite big. I
plan update later.

Just put a fsl,imx8ulp-mipi-cphy here, because it is quite similar with
fsl,imx8qxp-mipi-cphy

Frank
>
> > +        - power-domains
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    phy@...21000 {
> > +            compatible = "fsl,imx8qxp-mipi-cphy";
> > +            reg = <0x58221000 0x10000>;
> > +            #phy-cells = <0>;
> > +            power-domains = <&pd 0>;
> > +    };
> > +
> >
> > --
> > 2.34.1
> >