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 C7B44CFD2F6 for ; Tue, 2 Dec 2025 12:20:40 +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=pKjB/booLUKQ9OpXzyVFxwemDZWATSgb7Uu3UBFnUJQ=; b=ryocQ00TIIS88+88+hSWGYF/xD uMYxzK2UAD8eBe7XTuCaePzpuTgGNONpliQy2weVkYqrnE/PtcmsfmP/Hd8OJnXyLBi9Bw5/ZYSBM kSh+hZV4LJ3XZ1zc3TDDd/F7PQsi9Eyfx/XkdrwhbiLeP8Y1s49Eufa/9/31eNqAYZVm/QOy5xdYc nWWeaKaMpuybhYyJGtmETiNPnVd0kLiwmD70JtvXETYZsTC5vczTNzt/83hRaN8xSau0hk1CiKfZg +D0rTkqBPNwdZ3tGJoRF1gsYdWgKq9FUjWJ8kjRSILFSjD2/MNsmjWIz7A2IfE8RsqtDPCKeYwqSb Jq7xB76A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vQPMz-00000005N0c-3H8G; Tue, 02 Dec 2025 12:20:37 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vQPMx-00000005Mzv-3RZC for linux-arm-kernel@lists.infradead.org; Tue, 02 Dec 2025 12:20:35 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id A3BD76013F; Tue, 2 Dec 2025 12:20:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3BA9AC116D0; Tue, 2 Dec 2025 12:20:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1764678034; bh=31tcOEp6eL357PL61dZc3EH7EaFim3TFeH2HZruei58=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=AyjfiuXJHqtQtPk+w5vOkkX4d9CxxwiySatHbMeBYIAOame4JpUPRZo2e9lonnBMi f3xYHFXzFD8eo5le1wcJlrqvvCunLgv6IEVEwxChoom9R+7zCFZt8ooTpQz3eTujWv X5cqywT8SIk2rXuplk3Ejt9CthP8isPzqqUwyhydUNj4DvsOMOoEhzHOXCz7HKdJGU Bza6KmQq/IcZHCy3EzMsstFx7kU4QQdM8UoHuO9esrnJe6zgxaH5rVqizwkKZYBvq5 +SWNjNNEfNXpxJkTBj5W05b3xqoh+fRUju7MXloZHaemRTuO/X+VcGnEdzeJg/r0zq AFcumZuBgDPCg== Message-ID: <112178ce-189e-4437-b6ae-d54b36b59bb8@kernel.org> Date: Tue, 2 Dec 2025 13:20:26 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 05/21] ARM: dts: omap: Bind panel to panel-dpi instead of ti,tilcdc,panel driver To: Tomi Valkeinen , Kory Maincent Cc: Markus Schneider-Pargmann , Luca Ceresoli , Louis Chauvet , Thomas Petazzoni , Miguel Gazquez , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org, Jyri Sarha , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Russell King , Bartosz Golaszewski , Tony Lindgren , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec References: <20251126-feature_tilcdc-v1-0-49b9ef2e3aa0@bootlin.com> <20251126-feature_tilcdc-v1-5-49b9ef2e3aa0@bootlin.com> <96b1b7bf-ddbe-4213-a201-dc89cf2998dd@ideasonboard.com> <3bc5bf92-05c3-4841-ab28-9bab2bb31cd5@kernel.org> <20251202104244.59a9e83d@kmaincent-XPS-13-7390> <20251202114416.09624a4b@kmaincent-XPS-13-7390> <94e254fa-289d-41ed-909f-1742cfbb2690@kernel.org> <20251202121856.0da62885@kmaincent-XPS-13-7390> <1d9a9269-bfda-4d43-938b-2df6b82b9369@ideasonboard.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; keydata= xsFNBFVDQq4BEAC6KeLOfFsAvFMBsrCrJ2bCalhPv5+KQF2PS2+iwZI8BpRZoV+Bd5kWvN79 cFgcqTTuNHjAvxtUG8pQgGTHAObYs6xeYJtjUH0ZX6ndJ33FJYf5V3yXqqjcZ30FgHzJCFUu JMp7PSyMPzpUXfU12yfcRYVEMQrmplNZssmYhiTeVicuOOypWugZKVLGNm0IweVCaZ/DJDIH gNbpvVwjcKYrx85m9cBVEBUGaQP6AT7qlVCkrf50v8bofSIyVa2xmubbAwwFA1oxoOusjPIE J3iadrwpFvsZjF5uHAKS+7wHLoW9hVzOnLbX6ajk5Hf8Pb1m+VH/E8bPBNNYKkfTtypTDUCj NYcd27tjnXfG+SDs/EXNUAIRefCyvaRG7oRYF3Ec+2RgQDRnmmjCjoQNbFrJvJkFHlPeHaeS BosGY+XWKydnmsfY7SSnjAzLUGAFhLd/XDVpb1Een2XucPpKvt9ORF+48gy12FA5GduRLhQU vK4tU7ojoem/G23PcowM1CwPurC8sAVsQb9KmwTGh7rVz3ks3w/zfGBy3+WmLg++C2Wct6nM Pd8/6CBVjEWqD06/RjI2AnjIq5fSEH/BIfXXfC68nMp9BZoy3So4ZsbOlBmtAPvMYX6U8VwD TNeBxJu5Ex0Izf1NV9CzC3nNaFUYOY8KfN01X5SExAoVTr09ewARAQABzSVLcnp5c3p0b2Yg S296bG93c2tpIDxrcnprQGtlcm5lbC5vcmc+wsGVBBMBCgA/AhsDBgsJCAcDAgYVCAIJCgsE FgIDAQIeAQIXgBYhBJvQfg4MUfjVlne3VBuTQ307QWKbBQJoF1BKBQkWlnSaAAoJEBuTQ307 QWKbHukP/3t4tRp/bvDnxJfmNdNVn0gv9ep3L39IntPalBFwRKytqeQkzAju0whYWg+R/rwp +r2I1Fzwt7+PTjsnMFlh1AZxGDmP5MFkzVsMnfX1lGiXhYSOMP97XL6R1QSXxaWOpGNCDaUl ajorB0lJDcC0q3xAdwzRConxYVhlgmTrRiD8oLlSCD5baEAt5Zw17UTNDnDGmZQKR0fqLpWy 786Lm5OScb7DjEgcA2PRm17st4UQ1kF0rQHokVaotxRM74PPDB8bCsunlghJl1DRK9s1aSuN hL1Pv9VD8b4dFNvCo7b4hfAANPU67W40AaaGZ3UAfmw+1MYyo4QuAZGKzaP2ukbdCD/DYnqi tJy88XqWtyb4UQWKNoQqGKzlYXdKsldYqrLHGoMvj1UN9XcRtXHST/IaLn72o7j7/h/Ac5EL 8lSUVIG4TYn59NyxxAXa07Wi6zjVL1U11fTnFmE29ALYQEXKBI3KUO1A3p4sQWzU7uRmbuxn naUmm8RbpMcOfa9JjlXCLmQ5IP7Rr5tYZUCkZz08LIfF8UMXwH7OOEX87Y++EkAB+pzKZNNd hwoXulTAgjSy+OiaLtuCys9VdXLZ3Zy314azaCU3BoWgaMV0eAW/+gprWMXQM1lrlzvwlD/k whyy9wGf0AEPpLssLVt9VVxNjo6BIkt6d1pMg6mHsUEVzsFNBFVDXDQBEADNkrQYSREUL4D3 Gws46JEoZ9HEQOKtkrwjrzlw/tCmqVzERRPvz2Xg8n7+HRCrgqnodIYoUh5WsU84N03KlLue MNsWLJBvBaubYN4JuJIdRr4dS4oyF1/fQAQPHh8Thpiz0SAZFx6iWKB7Qrz3OrGCjTPcW6ei OMheesVS5hxietSmlin+SilmIAPZHx7n242u6kdHOh+/SyLImKn/dh9RzatVpUKbv34eP1wA GldWsRxbf3WP9pFNObSzI/Bo3kA89Xx2rO2roC+Gq4LeHvo7ptzcLcrqaHUAcZ3CgFG88CnA 6z6lBZn0WyewEcPOPdcUB2Q7D/NiUY+HDiV99rAYPJztjeTrBSTnHeSBPb+qn5ZZGQwIdUW9 YegxWKvXXHTwB5eMzo/RB6vffwqcnHDoe0q7VgzRRZJwpi6aMIXLfeWZ5Wrwaw2zldFuO4Dt 91pFzBSOIpeMtfgb/Pfe/a1WJ/GgaIRIBE+NUqckM+3zJHGmVPqJP/h2Iwv6nw8U+7Yyl6gU BLHFTg2hYnLFJI4Xjg+AX1hHFVKmvl3VBHIsBv0oDcsQWXqY+NaFahT0lRPjYtrTa1v3tem/ JoFzZ4B0p27K+qQCF2R96hVvuEyjzBmdq2esyE6zIqftdo4MOJho8uctOiWbwNNq2U9pPWmu 4vXVFBYIGmpyNPYzRm0QPwARAQABwsF8BBgBCgAmAhsMFiEEm9B+DgxR+NWWd7dUG5NDfTtB YpsFAmgXUF8FCRaWWyoACgkQG5NDfTtBYptO0w//dlXJs5/42hAXKsk+PDg3wyEFb4NpyA1v qmx7SfAzk9Hf6lWwU1O6AbqNMbh6PjEwadKUk1m04S7EjdQLsj/MBSgoQtCT3MDmWUUtHZd5 RYIPnPq3WVB47GtuO6/u375tsxhtf7vt95QSYJwCB+ZUgo4T+FV4hquZ4AsRkbgavtIzQisg Dgv76tnEv3YHV8Jn9mi/Bu0FURF+5kpdMfgo1sq6RXNQ//TVf8yFgRtTUdXxW/qHjlYURrm2 H4kutobVEIxiyu6m05q3e9eZB/TaMMNVORx+1kM3j7f0rwtEYUFzY1ygQfpcMDPl7pRYoJjB dSsm0ZuzDaCwaxg2t8hqQJBzJCezTOIkjHUsWAK+tEbU4Z4SnNpCyM3fBqsgYdJxjyC/tWVT AQ18NRLtPw7tK1rdcwCl0GFQHwSwk5pDpz1NH40e6lU+NcXSeiqkDDRkHlftKPV/dV+lQXiu jWt87ecuHlpL3uuQ0ZZNWqHgZoQLXoqC2ZV5KrtKWb/jyiFX/sxSrodALf0zf+tfHv0FZWT2 zHjUqd0t4njD/UOsuIMOQn4Ig0SdivYPfZukb5cdasKJukG1NOpbW7yRNivaCnfZz6dTawXw XRIV/KDsHQiyVxKvN73bThKhONkcX2LWuD928tAR6XMM2G5ovxLe09vuOzzfTWQDsm++9UKF a/A= In-Reply-To: <1d9a9269-bfda-4d43-938b-2df6b82b9369@ideasonboard.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit 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 02/12/2025 12:51, Tomi Valkeinen wrote: > Hi Kory, > > On 02/12/2025 13:18, Kory Maincent wrote: >> On Tue, 2 Dec 2025 11:47:40 +0100 >> Krzysztof Kozlowski wrote: >> >>> On 02/12/2025 11:44, Kory Maincent wrote: >>>> On Tue, 2 Dec 2025 11:28:55 +0100 >>>> Krzysztof Kozlowski wrote: >>>> >>>>> On 02/12/2025 10:42, Kory Maincent wrote: >>>>>> >>>>>>> Stuffing DTS change in the middle of the driver change tries to hide >>>>>>> impact, which is not nice on its own. >>>>>> >>>>>> As it needs driver change before the removal for not breaking things it >>>>>> can't be done at the beginning of the series. >>>>> >>>>> And that is the problem which should stop you there and rethink how to >>>>> organize it without impacting users. DTS cannot go via DRM. If that was >>>>> your intention, that's my: >>>>> >>>>> NAK >>>> >>>> My intention was to raise discussion over the ugly and legacy tilcdc-panel >>>> binding and what to do with it. But it seems you don't want to, that's a >>>> shame. >>> >>> I don't see how you get to these conclusions. I comment that putting >>> here DTS in the middle without any explanation of the impact is not >>> correct and this one alone I disagree with. >> >> Because you didn't replied to the first line of my answer: >> "Yes, I know this but I still wanted to try and begin a discussion on this, as I >> really thought it is not a good idea to add and maintain an new non-standard >> panel driver solely for this tilcdc panel binding." >> >> But indeed you are right, I should have put more explanation on why there is DTS >> and binding change in the middle of the series. Sorry for that. >> >>> From that you claim I don't want to fix things... >>> >>> DTS cannot go to drm, which means you either need to separate the change >>> and make entire work bisectable and backwards compatible for some time >>> OR at least document clearly the impact as we always ask. >> >> The thing is, if I split it, it has to be in 3. One for the of DRM bus flags >> support, a second for the the devicetree and binding change and a third for the >> whole tilcdc and tda998x cleaning stuff. I think I will go for one series, with >> better documentation. >> >> Now, what is your point of view on my question. Will you nak any binding >> removal even if the binding is ugly and legacy and imply maintaining an >> non-standard tilcdc panel driver? I know it breaks DTB compatibility but there >> is several argument to not keep it. See patch 6. > The binding being ugly and having to maintain non-standard tilcdc panel > driver may be nice things for us, the users don't care. The users care > if their board no longer works. Exactly. > > And how does this sync with u-boot? It also has code for at least for a > few of these boards. +1 > > Are there even users for these boards? If not, maybe they can be just > removed? I'm personally not familiar with these boards, so I have no > idea of their age or distribution. > > One trick that can be done is to modify the loaded DTB at boot time, > detecting the old format, converting it to the new one, so that when the > drivers are probed they only see the new DTB. Best regards, Krzysztof