From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B9219CA0FFE for ; Tue, 2 Sep 2025 09:00:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=bED5tF1OmMca6CVS+TCLsa9sopW1wAgbZtDN4ba4404=; b=PluffU0vIR1JgooWNW1okHTT7R UON+FC9bZ2rDUjoXlMKaQ55QhRfh9/Sl2qMvP3smve6Qt8Z952au8gIJxbZWXvNNQcqcTKomb2OPY ZlvSGBeGahwbLjphbaW+9GEwr0iqQQg+27HlpKHO1LZaBHrMaCLYLph814/+H1asFF3z1TafZKlE6 PmJBz7zZ02YpizLKjA7GmMWf7Gz3ZdL/v0tmye0IOHWAIgjail8g9j4ac3l0yP7oMGFHtaMs9PR44 PffpKJa64WosAYxbdl6u5IqR8Q1qI26GXjmrES2qXpVVuuMPv1Wnz+W5EIbM2Um036d1DB73nV0Fk M7qiQjmg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1utMsa-0000000GEAt-0fmU; Tue, 02 Sep 2025 09:00:40 +0000 Received: from perceval.ideasonboard.com ([213.167.242.64]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1utMV1-0000000G5j6-0rP5 for linux-arm-kernel@lists.infradead.org; Tue, 02 Sep 2025 08:36:21 +0000 Received: from pendragon.ideasonboard.com (230.215-178-91.adsl-dyn.isp.belgacom.be [91.178.215.230]) by perceval.ideasonboard.com (Postfix) with UTF8SMTPSA id ACD1BC75; Tue, 2 Sep 2025 10:35:07 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1756802107; bh=9b9oj9NtnjkgCqLHI/easGtUlL/TclnyNvdB1pRPJ10=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=BGOySrfRK7wpIrVW8pam0Ry99/B6YUY4pxhePRpqXmQ4bRXZFruERAo3LeGWgimon o/2Wg5FRxVjaaLNOYl/+zymSodr6I2YJhJRDo+jpP6ffXxCw07kDAMnlXmAGxUC1O+ wIoZkgmSqEVDBzhib+eXd4wHBTQaA32pg7lKmLTk= Date: Tue, 2 Sep 2025 10:35:54 +0200 From: Laurent Pinchart To: Frank Li Cc: Guoniu Zhou , Rui Miguel Silva , Martin Kepplinger , Purism Kernel Team , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Philipp Zabel , linux-media@vger.kernel.org, devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v5 1/4] media: dt-bindings: nxp,imx8mq-mipi-csi2: Add i.MX8ULP compatible string Message-ID: <20250902083554.GD13448@pendragon.ideasonboard.com> References: <20250901-csi2_imx8ulp-v5-0-67964d1471f3@nxp.com> <20250901-csi2_imx8ulp-v5-1-67964d1471f3@nxp.com> <20250901154610.GB13448@pendragon.ideasonboard.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250902_013619_703469_56021217 X-CRM114-Status: GOOD ( 27.81 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Sep 01, 2025 at 09:45:39PM -0400, Frank Li wrote: > On Mon, Sep 01, 2025 at 05:46:10PM +0200, Laurent Pinchart wrote: > > 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 > > > --- > > > .../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 only clock number difference, generally, it is still compatible and can > be fallback, especialy driver use devm_bulk_clk_get_all(). That's a driver-specific implementation decision, so I don't think it should be taken into account to decide on compatibility. > If driver have not sperated drvdata for it, we can fallback to it. It is > quite common. > > > > + > > > + - 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