From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BD6C82C026C; Mon, 17 Nov 2025 16:29:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763396987; cv=none; b=OWVjJoV10QGXEbwAlL47V/FrseeSGz1UE0JwZXbuym/Qwr0eyPHjma7tn4CKXAOcZohJMWyyfmLZZBIMZSjl5i3D/Ubmq5DVQVUNpjZ7B8M6R8J72fGYqVIhPG/VOw5YWbJqh7H5i6lpYn2dzlg+i0L4xlDQ+7AlXPNNYOuQb/Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763396987; c=relaxed/simple; bh=xgBu2oSRFLieRp9WmCYV/Um+xGFfCkzTRf2alrPbdS4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=F+gseLT3TfnsXSzhZLjsU56kCwB3i2F7DGZZJKWoV9/+ai2eu6AyvcXZV+tC0LU1MFiFWVSXXDo7LUnVbGN5G/BZwmlfuDavhhByPVmhLjHUSTCQiymFFO5FfWzCZXKblYK+L1u+jEKyfh4u+lPr8z5ym0PqvZptgbCE8vwB4VU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QWBGIMv2; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="QWBGIMv2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 657F8C19422; Mon, 17 Nov 2025 16:29:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763396987; bh=xgBu2oSRFLieRp9WmCYV/Um+xGFfCkzTRf2alrPbdS4=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=QWBGIMv2xLPXXYkxod979hRRcjssaGVk55jM6JtsAlg6HcRjdm7lLTLttulVADyPZ cOeEh+k67Udlgl8cU8XiUNpB95Tnzgevknq7ae5T+QBb+8MzAUr14htbIzb7KknHw+ VettzeV/Ccx84EAdtv9I25xWbAN5044/cJZaOVUsTGUVNR8G6MmNUww355pyPPW2xN 0MN06tH3kq4twEAhMhTRULvR3MCdat6cSQFBvSqFU8DI7eZtybnrfMCvKxdBd90BgV 3XFxGjx3I1A8DhsGZ8CFF8c4mAFzeae3609jweuIUX7OWJtuUiUHhUM80LOhmsK6D6 dC88PfOVwW20Q== Message-ID: <07ee3540-d0c1-436e-9e1d-db1952f609a6@kernel.org> Date: Mon, 17 Nov 2025 17:29:43 +0100 Precedence: bulk X-Mailing-List: devicetree-spec@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: SoC-specific device tree aliases? To: Rob Herring Cc: Sascha Hauer , "devicetree@vger.kernel.org" , Conor Dooley , Ahmad Fatoum , devicetree-spec@vger.kernel.org, quentin.schulz@cherry.de, Marc Kleine-Budde , "kernel@pengutronix.de" , Krzysztof Kozlowski References: <58816b68-3b09-4320-9a4e-09f2c2b2d0fa@kernel.org> <8ce701c9-6c8d-4b3e-8706-760b8aba89fc@kernel.org> <20251117-smooth-spiked-loon-52df28-mkl@pengutronix.de> <576a9eae-7dba-47d0-ad66-0a81d1893271@kernel.org> <9e14fb8e-af84-4072-b0ac-9ead882782be@kernel.org> 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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 17/11/2025 17:06, Rob Herring wrote: >>>> >>>>> >>>>> Also I don't get whether you are suggesting >>>>> >>>>> A is as fragile as B, so you could equally well do B >>>> >>>> Both are fragile, so I would be happy to see arguments why A is better >>>> than B. Why? Because with B you don't need any binding because all the >>>> information is already in DTS. >>> >>> What do you consider fragile with it? >> >> Only that you rely on a specific register values and their meaning. >> >> Anyway, I would just go with standard aliases, but add a schema for each >> of such cases (SoCs or vendors), so you will define this as an ABI. >> >> One of the reasons why Barebox was affected by all node renames and >> alias reshuffling was that it was never documented that anyone treats >> this as an ABI. >> >> So you want it to be an ABI for barebox, sure, just make it a binding. > > What do you have in mind? Other than standard names for the aliases, > what can we check here? That a specific alias points to a specific > path? That would be a bit too much IMO. That would be equivalent to > specifying possible values in 'reg' for all devices. Binding with pattern or list of needed alias names, referenced by given soc-platform top-level schema. One of the points is to make it explicit and obvious (e.g. to Arnd or to me if I forget, because I follow the same logic of aliases per board) that these aliases are used outside of kernel. Just because ufs/mmc/spi can be used that way, does not mean we should accept any possible alias into soc.dtsi. Best regards, Krzysztof