From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3FDEF606A320 for ; Wed, 21 Oct 2026 02:42:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=KLC3v4Di; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=IY39tHg5 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-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=oLBODvbSr6gtJBJto96ISE7H3MJPrfgXiOoDCPQrvq8=; b=KLC3v4DinVId6tU+Opumm5Wtqu hOLLnuilFoT1dVCQp0sk2hz2CYIHRrXcWFOQC7X5tql+4Yhqz/Xg03VCCiyfcfPiWUFJs2uQZCj+4 RA+NTmTJOwZxSaRHX12UyUfuJdapxcm4dahbPPzKuHUfkl75ldQBj2cmokrySkpib6B0mpkpKVkOT AfbvMCIxuWyzRsk94fujXkosfXrjEZJUt11XxCVOslT1qAm9zLFC6XpleD+1FJOqUv8xCncXsxqm3 1Ke4UkTMZqD06ksWbxRTXYrYWgiQnF/YUoC0AB5Rxg9lnDgFuNpGXvO9bzdoFdpSk/tDCf7VnGBic GXeio2EQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xJMHq-0000000AxXS-2geM; Wed, 21 Oct 2026 02:42:42 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xJMHp-0000000AxXG-3fqN; Wed, 21 Oct 2026 02:42:41 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id EBB5860142; Wed, 21 Oct 2026 02:42:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6C02B1F000C9; Wed, 21 Oct 2026 02:42:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792550560; bh=oLBODvbSr6gtJBJto96ISE7H3MJPrfgXiOoDCPQrvq8=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=IY39tHg53XDT9wDChQziERP7v+ZcmXqAlg+Hg7cYkakX1Nov638ol1YuM8hp8XCRk 9WcNhLLwS8Snk7dDeIWAVl7jkbA1HxsGv2WKZWOpqODHUpZKLJgPO3c4dw7emPUSOQ LfuNNjdN0JCHb9hKkA0Pf2y6PePRTtVyfL3s331SFoci7r3vFAQFFjrIJ9QoQNbmJg hTH14eicBbmzPbZQHmYYrUxjNel5YcCe9IRSw1UuRU5r+HjhSHRg9a3Qg0bRaCiIUY 20ubXMuOUUL+4tDT7MQ75rQMrTKuQQ0+Q7dqu54hBYXbWrNHTZH5uOefRZq1kWawy+ f6CI6jS93guPA== Date: Tue, 20 Oct 2026 21:42:39 -0500 From: Rob Herring To: Heiko =?iso-8859-1?Q?St=FCbner?= Cc: =?utf-8?B?5qWK5pm65oiQ?= , Michael Riesch , Krzysztof Kozlowski , Vinod Koul , Neil Armstrong , Manivannan Sadhasivam , Krzysztof Kozlowski , Conor Dooley , Guochun Huang , Philipp Zabel , Sebastian Reichel , Bryan O'Donoghue , linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v5 2/8] dt-bindings: phy: rockchip,rk3588-mipi-dcphy: Add a cell to select TX or RX Message-ID: <20261021024239.GA3667411-robh@kernel.org> References: <20261016-dcphy-rx-v1-v5-0-e63b49eabe2d@gmail.com> <2501273.NG923GbCHz@diego> <20261020141039.GB4157247-robh@kernel.org> <25254818.ouqheUzb2q@diego> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <25254818.ouqheUzb2q@diego> X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-6.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Tue, Oct 20, 2026 at 04:57:34PM +0200, Heiko Stübner wrote: > Am Dienstag, 20. Oktober 2026, 16:10:39 Mitteleuropäische Sommerzeit schrieb Rob Herring: > > On Tue, Oct 20, 2026 at 03:37:35PM +0200, Heiko Stübner wrote: > > > Am Dienstag, 20. Oktober 2026, 00:20:47 Mitteleuropäische Sommerzeit schrieb Michael Riesch: > > > > Hi all, > > > > > > > > On 10/19/26 17:06, Rob Herring wrote: > > > > > On Mon, Oct 19, 2026 at 04:15:03PM +0800, 楊智成 wrote: > > > > >> Hi Krzysztof, Rob, > > > > >> > > > > >>> Existing OS should ignore surplus cell if the driver is coded properly. > > > > >>> Same as adding new properties or new front-compatible. The question is > > > > >>> how the existing driver behaves? > > > > >> > > > > >> As you pointed out on 5/8, the xlate checks args_count != 1. The DC-PHY > > > > >> driver was merged in v6.15, so every kernel since 6.15 fails on a second cell. > > > > >> > > > > >> 1. Keep the second cell. Add the patch as follows: > > > > >> > > > > >> - if (args->args_count != 1) { > > > > >> + if (args->args_count < 1) { > > > > >> dev_err(dev, "invalid number of arguments\n"); > > > > >> return ERR_PTR(-EINVAL); > > > > >> } > > > > >> > > > > >> + if (args->args_count > 1 && args->args[1]) { > > > > >> + dev_err(dev, "only the transmitter is supported\n"); > > > > >> + return ERR_PTR(-EINVAL); > > > > >> + } > > > > >> > > > > >> With Fixes: and Cc: stable, the stable kernels maintained at that > > > > >> time (currently 6.18.y and 7.2.y) keep DSI working with the new > > > > >> dts, and the receiver fails cleanly instead of getting the transmitter. > > > > >> But EOL kernels (6.15, 6.16, 6.17, 6.19, 7.0, 7.1) stay affected. > > > > >> It goes in with the series, since two-cell dts only exist after it. > > > > >> > > > > >> 2. Use a flag in the upper bits of the existing cell, as Rob > > > > >> suggested. Existing kernels are not affected, unless a board enables > > > > >> the DC-PHY CSI-2 receiver on 7.0 or later without this series. > > > > >> > > > > >> I will write the impact clearly whichever approach is selected in > > > > >> the related commit messages and the cover letter. > > > > >> > > > > >> I think the cell approach is easier to read and more symmetric in the > > > > >> long term, > > > > >> but it breaks more. Which one do you think is better? Thanks. > > > > > > > > > > I'm not a user of this platform, so I don't care. Up to the platform > > > > > maintainers to decide if breakage is acceptible. You just need to > > > > > document the issue in the commit message. > > > > > > > > > > Rob > > > > > > > > It's a bit of a pickle, all this. > > > > > > > > I gave it some more thought. In the end this is an IP block with two > > > > PHYs. No more, no less. One cell is sufficient to address those, and it > > > > could be 0 for the transmitting PHY (DSI, display) and 1 for the > > > > receiving PHY (CSI, camera). > > > > > > > > Of course the two PHYs can operate in either DPHY or CPHY mode. The > > > > phy-cells have been (mis?)used to select the proper mode of combo PHYs, > > > > and this principle has been applied here too. > > > > > > > > However, we have the special situation here that the mode can only be > > > > changed for the complete IP block (and thus for both PHYs at the same > > > > time). As Bryan points out, we need to check and complain if the PHY > > > > mode is not set to the same value for both PHYs. > > > > > > > > I suggest using a property > > > > samsung,cphy-mode; > > > > > > I guess, a maybe nicer way would be mimicing > > > Documentation/devicetree/bindings/phy/intel,combo-phy.yaml > > > > > > with its > > > intel,phy-mode = > > > > > > with x coming from include/dt-bindings/phy/phy.h > > > for the distinction between cphy and dphy, so we don't introduce yet > > > another way to describe this. > > > > We already have the plain 'phy-type' property which takes the same > > PHY_MODE_x values. We don't need yet another vendor specific property. > > even better then ... and I didn't look deep enough it seems. > > > > > > (name to be bikeshedded) that sets the complete IP block into CPHY mode > > > > (DPHY being the default) to distinguish between the modes. Since both > > > > modes use a different electrical interface, this is clearly a hardware > > > > thing and thus suitable for device tree. > > > > > > > > Then, we can address the two PHYs with the help of the already existing > > > > phy cell (without any bitflag tweaks to the value). > > > > > > > > The sole drawback is that we need to accept the PHY_TYPE_DPHY and > > > > PHY_TYPE_CPHY values that some OS in the field might pass. (For Linux, > > > > it should only be the former.) And we need to handle those values > > > > correctly. But I think this is not more painful than the other > > > > approaches. At the same time, this design seems to be the most correct > > > > > > The current cell values are 10 + 11, so as long as we don't re-use those > > > exact values for the other constants the driver should somewhat easily > > > be able to recognize an old DT? > > > > I think you will still have an ABI issue of what does old OS do with new > > values? > > wasn't the main contract, a newer kernel should support old DTs ? Well, yes, it was. That was a position I inherited. I hear complaints about the opposite though. > Aka the DT is parked in some firmware part (u-boot?) and gets handed > to the newer kernel. > > I don't see deliberately handing a newer DTB to an older kernel as a > very common occurence? Do you want things to break when you do a firmware update that's picked up a newer DT? I don't. > And from a practical standpoint: > > We're talking about devices with DSI displays that are at stake here, > so we're in the embedded world. > > In other areas we're still fighting basic functionality like actually > handling the type-c orientation correctly in the usbphy. > > So I really don't see a device with a user-updateable mainline kernel out > in the field, apart from people hacking around on their devices to try > out new features and new kernels, simply because core functionality > is still evolving in mainline. > > > RK3576/RK3588 devices still ship with a vendor u-boot/kernel, with > completely incompatible DTB afterall. I can only keep my own house clean... I only ask that compatibility issues be documented. Up to individual platforms to decide if they care or not. So, your decision. Rob From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AE469606A321 for ; Wed, 21 Oct 2026 02:42:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=ttSwgw7S; dkim=fail reason="signature verification failed" (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=IY39tHg5 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: 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1xJMHp-0000000AxXG-3fqN; Wed, 21 Oct 2026 02:42:41 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id EBB5860142; Wed, 21 Oct 2026 02:42:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6C02B1F000C9; Wed, 21 Oct 2026 02:42:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792550560; bh=oLBODvbSr6gtJBJto96ISE7H3MJPrfgXiOoDCPQrvq8=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=IY39tHg53XDT9wDChQziERP7v+ZcmXqAlg+Hg7cYkakX1Nov638ol1YuM8hp8XCRk 9WcNhLLwS8Snk7dDeIWAVl7jkbA1HxsGv2WKZWOpqODHUpZKLJgPO3c4dw7emPUSOQ LfuNNjdN0JCHb9hKkA0Pf2y6PePRTtVyfL3s331SFoci7r3vFAQFFjrIJ9QoQNbmJg hTH14eicBbmzPbZQHmYYrUxjNel5YcCe9IRSw1UuRU5r+HjhSHRg9a3Qg0bRaCiIUY 20ubXMuOUUL+4tDT7MQ75rQMrTKuQQ0+Q7dqu54hBYXbWrNHTZH5uOefRZq1kWawy+ f6CI6jS93guPA== Date: Tue, 20 Oct 2026 21:42:39 -0500 From: Rob Herring To: Heiko =?iso-8859-1?Q?St=FCbner?= Cc: =?utf-8?B?5qWK5pm65oiQ?= , Michael Riesch , Krzysztof Kozlowski , Vinod Koul , Neil Armstrong , Manivannan Sadhasivam , Krzysztof Kozlowski , Conor Dooley , Guochun Huang , Philipp Zabel , Sebastian Reichel , Bryan O'Donoghue , linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v5 2/8] dt-bindings: phy: rockchip,rk3588-mipi-dcphy: Add a cell to select TX or RX Message-ID: <20261021024239.GA3667411-robh@kernel.org> References: <20261016-dcphy-rx-v1-v5-0-e63b49eabe2d@gmail.com> <2501273.NG923GbCHz@diego> <20261020141039.GB4157247-robh@kernel.org> <25254818.ouqheUzb2q@diego> X-Archived-By: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <25254818.ouqheUzb2q@diego> X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Archive: List-Post: List-Help: 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h=Date:From:To:Cc:Subject:References:In-Reply-To; b=IY39tHg53XDT9wDChQziERP7v+ZcmXqAlg+Hg7cYkakX1Nov638ol1YuM8hp8XCRk 9WcNhLLwS8Snk7dDeIWAVl7jkbA1HxsGv2WKZWOpqODHUpZKLJgPO3c4dw7emPUSOQ LfuNNjdN0JCHb9hKkA0Pf2y6PePRTtVyfL3s331SFoci7r3vFAQFFjrIJ9QoQNbmJg hTH14eicBbmzPbZQHmYYrUxjNel5YcCe9IRSw1UuRU5r+HjhSHRg9a3Qg0bRaCiIUY 20ubXMuOUUL+4tDT7MQ75rQMrTKuQQ0+Q7dqu54hBYXbWrNHTZH5uOefRZq1kWawy+ f6CI6jS93guPA== Date: Tue, 20 Oct 2026 21:42:39 -0500 From: Rob Herring To: Heiko =?iso-8859-1?Q?St=FCbner?= Cc: =?utf-8?B?5qWK5pm65oiQ?= , Michael Riesch , Krzysztof Kozlowski , Vinod Koul , Neil Armstrong , Manivannan Sadhasivam , Krzysztof Kozlowski , Conor Dooley , Guochun Huang , Philipp Zabel , Sebastian Reichel , Bryan O'Donoghue , linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v5 2/8] dt-bindings: phy: rockchip,rk3588-mipi-dcphy: Add a cell to select TX or RX Message-ID: <20261021024239.GA3667411-robh@kernel.org> References: <20261016-dcphy-rx-v1-v5-0-e63b49eabe2d@gmail.com> <2501273.NG923GbCHz@diego> <20261020141039.GB4157247-robh@kernel.org> <25254818.ouqheUzb2q@diego> X-Archived-By: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <25254818.ouqheUzb2q@diego> X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-phy" X-Spam-Status: No, score=-4.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 T24gVHVlLCBPY3QgMjAsIDIwMjYgYXQgMDQ6NTc6MzRQTSArMDIwMCwgSGVpa28gU3TDvGJuZXIg 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