From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtpout-03.galae.net (smtpout-03.galae.net [185.246.85.4]) (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 D98A5421880; Mon, 8 Jun 2026 15:05:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.246.85.4 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780931131; cv=none; b=Lgk5uZTxeggUsf39VTorL7U1DpYSb7lYzj2YyIGOLt2Ey8SzJjy2hNZN/aYZe5lzcFrsHoqKLbNNH/+LUfIx4Mez0sZAxcVmIMD2S4CaJhn8UJUd78meMXNQ2lj0v9TChmxMmWSobxvmnQObHsOADMFdlMdnrh/4szxHy3rcEY8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780931131; c=relaxed/simple; bh=RWEsvSAq7ltiLSc4M7S0u33C9h51EmAl0FCKmQlIJrk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=eiiJNkJm0lriu73RSgZv6juSsvtFoaTcKqG1ON9BhkH76RbTTdNdthWDO7YOX1tP/fI/15ZhNjpOreMoMK5/KivhmYagOeN8XP/00THZ3pdh7AOe7wFAbohxl4E8fKmem7w2oipfR923pvwXFXtjjj/OYomWj8OZygKpZVqseyc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=2g7NN/Td; arc=none smtp.client-ip=185.246.85.4 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="2g7NN/Td" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-03.galae.net (Postfix) with ESMTPS id 5287C4E41672; Mon, 8 Jun 2026 15:05:26 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 25C525FFB7; Mon, 8 Jun 2026 15:05:26 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 9E22A106A012C; Mon, 8 Jun 2026 17:05:21 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1780931125; h=from:subject:date:message-id:to:cc:mime-version:content-type: in-reply-to:references; bh=2iO37rqCp8Bs5CHZkoCFUdRXh+bredeUM2BucmQS/c8=; b=2g7NN/TdRn+HON9Qz7VDE8oxJ54eXQ8Xw6enEE3N39Bgcj2RHx9LNzvdVG6G+Kho9qkMki lLG7kSQKadxtVi6CCDnm2RxVpDGZTdXmnwgmvCWtPOnMxY/mUAVro3ojwULhBgaar6pG0p u3Tfd2Rlwnci14p9HX2QPpFHxC0C6A9YMkpHsxWceCx4d0g6JMwI8DcY1ASf+Fa6UA9N1Y azeBHhISVaj8/rE5Cvr5jXWRQYYifLCNGhS0DvgYPNUhhFnih8gEYBBxPTUMeWAKRKvXNM KAmcJqqux7555Mv8voJvUcHj4LmYNPNDkxNmnrLW7lyN9tCuSkj6fPM7X7eZwQ== From: Romain Gantois To: Jonathan Cameron Cc: Puranjay Mohan , David Lechner , Nuno =?UTF-8?B?U8Oh?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Thomas Petazzoni , Wil Stark , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: Re: [PATCH 1/2] dt-bindings: iio: ti,tmp117: add binding for the TMP119 Date: Mon, 08 Jun 2026 17:05:20 +0200 Message-ID: <0JXKC01fTuif-8VlbZtc5Q@bootlin.com> In-Reply-To: <20260605152005.4d888f6b@jic23-huawei> References: <20260605-tmp119-v1-0-349f45f17d12@bootlin.com> <20260605152005.4d888f6b@jic23-huawei> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPartkwe-YhX2RNmWXg_K9c85Xw"; micalg="pgp-sha512"; protocol="application/pgp-signature" X-Last-TLS-Session-Version: TLSv1.3 --nextPartkwe-YhX2RNmWXg_K9c85Xw Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8"; protected-headers="v1" From: Romain Gantois To: Jonathan Cameron Date: Mon, 08 Jun 2026 17:05:20 +0200 Message-ID: <0JXKC01fTuif-8VlbZtc5Q@bootlin.com> In-Reply-To: <20260605152005.4d888f6b@jic23-huawei> MIME-Version: 1.0 On Friday, 5 June 2026 16:20:05 CEST Jonathan Cameron wrote: > On Fri, 05 Jun 2026 14:24:45 +0200 ... > > > > > The second patch then just resolves the print that would happen on older > > > kernels using that fallback due to ID mismatch. That's fine but nice > > > if older kernels can work with this part. > > > > Sorry I don't quite understand: since this is a feature patch, I don't > > expect it would get backported onto older kernels. Therefore why would > > the second patch resolve the print happening on older kernels? > > The point of a fallback compatible is that we don't have to backport > anything. New device tree comes along that lists > > compatible = "ti,tmp119", "ti,tmp117" > > will just work. Older kernel will think it has a tmp117 which is fine as > they are register interface compatible. It will print a message to say > that it found an unknown ID but then assume it is what the firmware told > it, here the tmp117 fallback. With your second patch in place, that > harmless message will disappear for new kernels. Ok I understand, thanks for the explanation. Thanks, -- Romain Gantois, Bootlin Embedded Linux and Kernel engineering https://bootlin.com --nextPartkwe-YhX2RNmWXg_K9c85Xw Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part. 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