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Message-ID: <20250901154610.GB13448@pendragon.ideasonboard.com>
Date: Mon, 1 Sep 2025 17:46:10 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Guoniu Zhou <guoniu.zhou@....com>
Cc: Rui Miguel Silva <rmfrfs@...il.com>,
Martin Kepplinger <martink@...teo.de>,
Purism Kernel Team <kernel@...i.sm>,
Mauro Carvalho Chehab <mchehab@...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>, Frank Li <Frank.Li@....com>,
linux-media@...r.kernel.org, devicetree@...r.kernel.org,
imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/4] media: dt-bindings: nxp,imx8mq-mipi-csi2: Add
i.MX8ULP compatible string
Hi Guoniu,
Thank you for the patch.
On Mon, Sep 01, 2025 at 02:25:29PM +0800, Guoniu Zhou wrote:
> The CSI-2 receiver in the i.MX8ULP is almost identical to the version
> present in the i.MX8QXP/QM, but i.MX8ULP CSI-2 controller needs pclk
> clock as the input clock for its APB interface of Control and Status
> register(CSR). So add compatible string fsl,imx8ulp-mipi-csi2 and
> increase maxItems of Clocks (clock-names) to 4 from 3. And keep the
> same restriction for existed compatible.
s/existed/existing/
> Signed-off-by: Guoniu Zhou <guoniu.zhou@....com>
> ---
> .../bindings/media/nxp,imx8mq-mipi-csi2.yaml | 46 ++++++++++++++++++++--
> 1 file changed, 43 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/media/nxp,imx8mq-mipi-csi2.yaml b/Documentation/devicetree/bindings/media/nxp,imx8mq-mipi-csi2.yaml
> index 3389bab266a9adbda313c8ad795b998641df12f3..412cedddb0efee1a49d1b90b02baa7a625c797ec 100644
> --- a/Documentation/devicetree/bindings/media/nxp,imx8mq-mipi-csi2.yaml
> +++ b/Documentation/devicetree/bindings/media/nxp,imx8mq-mipi-csi2.yaml
> @@ -21,7 +21,9 @@ properties:
> - fsl,imx8mq-mipi-csi2
> - fsl,imx8qxp-mipi-csi2
> - items:
> - - const: fsl,imx8qm-mipi-csi2
> + - enum:
> + - fsl,imx8qm-mipi-csi2
> + - fsl,imx8ulp-mipi-csi2
> - const: fsl,imx8qxp-mipi-csi2
According to this, the ULP version is compatible with the QXP version.
>
> reg:
> @@ -39,12 +41,16 @@ properties:
> clock that the RX DPHY receives.
> - description: ui is the pixel clock (phy_ref up to 333Mhz).
> See the reference manual for details.
> + - description: pclk is clock for csr APB interface.
> + minItems: 3
>
> clock-names:
> items:
> - const: core
> - const: esc
> - const: ui
> + - const: pclk
> + minItems: 3
>
> power-domains:
> maxItems: 1
> @@ -130,19 +136,53 @@ allOf:
> compatible:
> contains:
> enum:
> - - fsl,imx8qxp-mipi-csi2
> + - fsl,imx8ulp-mipi-csi2
> + then:
> + properties:
> + reg:
> + minItems: 2
> + resets:
> + minItems: 2
> + maxItems: 2
> + clocks:
> + minItems: 4
> + clock-names:
> + minItems: 4
But according to this, the ULP version requires more clocks than the QXP
version.
> +
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - fsl,imx8qm-mipi-csi2
QM is compatible with the QXP, so you don't need to list it here.
contains:
const: fsl,imx8qxp-mipi-csi2
is enough to cover both.
> + const: fsl,imx8qxp-mipi-csi2
> then:
> properties:
> reg:
> minItems: 2
> resets:
> maxItems: 1
> - else:
> + clocks:
> + maxItems: 3
> + clock-names:
> + maxItems: 3
> +
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - fsl,imx8mq-mipi-csi2
> + then:
> properties:
> reg:
> maxItems: 1
> resets:
> minItems: 3
> + clocks:
> + maxItems: 3
> + clock-names:
> + maxItems: 3
> required:
> - fsl,mipi-phy-gpr
>
--
Regards,
Laurent Pinchart
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