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 24716CA100B for ; Tue, 2 Sep 2025 16:15:41 +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:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=9yKNMZdT6ukq5LpQc/7B6EBSxslkFIPxE8Qwvc3gihI=; b=lVcr1Aa1Bfz3bfxLgmh0Jp4T1V MrbxvkPqJ6mMrRk81gDr3IyAbixPLLaZLS39KnHJSEz3n6gtSrytjClNTimbKuED/mR10EQEzAX1r RKf8MWuUEpAIvms0Pb3mCE6fF9ROGJzD506KJOmE/GaOymuZI9Kz2XuD8YMVOiSYXKaW4a4O5KDgJ mueWCreM7+ixCEwwU5BHy0ETW+dD35fJebfMV3Ea/WjcPoD258cyNPncuYsJ4u/4vb9tUe388KYon Ijygnc2RgXBzIiNvJcBSP+rp02aHQcBEVk8mr7GLEpt2DxI4xHBtaxsqcnAwO0MH+YXkTp7xMfXoB i43vdprg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1utTfT-00000000u1S-2Ax9; Tue, 02 Sep 2025 16:15:35 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1utQ6G-0000000HDjs-4BF0 for linux-arm-kernel@lists.infradead.org; Tue, 02 Sep 2025 12:27:02 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 35A4B43F2D; Tue, 2 Sep 2025 12:27:00 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5DAE6C4CEF4; Tue, 2 Sep 2025 12:26:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1756816020; bh=uy+9yT0OqxOwyvDOHi6skVuSOa8RvKqXi+oLTHQDSUM=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=MPSYmRKriAme9P6tqUdJc15hqm7gOnffta4xko1zzU6tJERGTnbLIQVIZW8ELBogZ ugpVpP6/1g6OkkECCLPLIXIhcHIeYiTPhJ8RedPevIqPShff2FKF+3oj2PUpZolzw5 BaH5cFKj86U8zBAXKtNRvfigcNANmYZqpzgJ6kZh+BIuO6CA6+rWnPZk21oMa3o2lD +D7QTajSFKcoGP4t0lM/RjTRsC96D3AAi+DSZ0xJHBbJ4PvihOfRsHixzD3SB7WRrN 9isexyZCe5N8dDi9dqvp2otBhVbBLrMDxmK50LR50ubTE1zu8z+HCCi2/gTZLQHk8r 5fiZrtNfkXtTg== Message-ID: <7c461931-3b04-4354-a892-52f469511c5a@kernel.org> Date: Tue, 2 Sep 2025 14:26:53 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 1/4] media: dt-bindings: nxp,imx8mq-mipi-csi2: Add i.MX8ULP compatible string To: Laurent Pinchart , 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 References: <20250901-csi2_imx8ulp-v5-0-67964d1471f3@nxp.com> <20250901-csi2_imx8ulp-v5-1-67964d1471f3@nxp.com> <20250901154610.GB13448@pendragon.ideasonboard.com> <20250902083554.GD13448@pendragon.ideasonboard.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250902_052701_077478_98A963FF X-CRM114-Status: GOOD ( 12.63 ) 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 02/09/2025 10:35, Laurent Pinchart wrote: >>>> 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. The clock inputs do not restrict compatibility. If Linux can use fallback to bind and operate properly, then it's a strong indication devices are compatible. Imagine exactly the same registers, so same programming interface, but one device takes one more clock which just needs to be enabled through its lifetime. Such devices are fully compatible, even though clock inputs differ. I also wanted to express exactly that case on my slides from OSSE - slide 28: https://osseu2025.sched.com/event/25Vsl/dts-101-from-roots-to-trees-aka-devicetree-for-beginners-krzysztof-kozlowski-linaro (although I focused on reversed case when devices are not compatible, because that is decisive case). Best regards, Krzysztof