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 D8D061922F5; Thu, 26 Mar 2026 08:41:03 +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=1774514463; cv=none; b=ZxSDigvgprDlAdaGl+NyRZa9rDV2JCGSBGHv62u+LvuPzfWsdly/FUcxwkw7aSmds36/AuaC1cTUX3RflHeRd+r4XmsB6PwukLuCJKKMfGSYyCPSJkZWIkLHTl3a2s2cef9+UCzh23TcbxJv2C8WOf/KU8wfOJtgLKFa/ZyC0ok= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774514463; c=relaxed/simple; bh=0SAblPH1XqQLvGdcjAfRvzYQoMpv55rPMjM79Ead8qU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=bP/liHLWNJ0gRDhs/d/Hkv1mGQcz97Bb2ild3enl4UKnGdgAhO+FDl9fQBaqJujTFsl3SVhPtRCqHRjIkivTyWDuGsg0KOFZyGNC5zVXLHNECNtgPZn+8cJzCGNEEfSU15qXVtZMvgAG5L1dALG8RLseJbF0XwR6LwCoc9DbWWA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QT4bUVZS; 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="QT4bUVZS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F08C4C116C6; Thu, 26 Mar 2026 08:41:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774514463; bh=0SAblPH1XqQLvGdcjAfRvzYQoMpv55rPMjM79Ead8qU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=QT4bUVZSZJt2iGbjA/8YCh+whQgc1RthrPG4RcNog4KZOUFY+y5GVyUjadAmuYCZA wyIsj0ZoCczBmpEIAqDy/ZT5qf+8KtNMG7EGAzIlZhhl/3Exxg3qL8HaWvuOsJcXwV roRahoskkiIwH96+zDYEv9pUuzIhGTBeINGnQmLzpnsW7fYfLq00J9K1Wd+SPyS6HB w32be45mS3v9lrW0+KjkIvd1h1xasFnL4xMn9PbEWvJ/5U9u52seTj2Wkqcp4FuG/7 3Yzl8b14MJvL8RGNTQXii/bL64YSCfBzhZedMD/LpIJ79K6QiWTjgtmINaTmET28VY yPNX1Lxq1cL7w== Date: Thu, 26 Mar 2026 09:41:01 +0100 From: Krzysztof Kozlowski To: Thierry Reding Cc: Mikko Perttunen , Thierry Reding , Uwe =?utf-8?Q?Kleine-K=C3=B6nig?= , Jonathan Hunter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-pwm@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Thierry Reding Subject: Re: [PATCH v2 1/7] dt-bindings: pwm: Document Tegra194 and Tegra264 controllers Message-ID: <20260326-lean-nippy-flamingo-4437bb@quoll> References: <20260325-t264-pwm-v2-0-998d885984b3@nvidia.com> <20260325-t264-pwm-v2-1-998d885984b3@nvidia.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: On Wed, Mar 25, 2026 at 03:22:13PM +0100, Thierry Reding wrote: > On Wed, Mar 25, 2026 at 07:16:59PM +0900, Mikko Perttunen wrote: > > From: Thierry Reding > > > > The PWM controller found on Tegra264 is largely compatible with the one > > on prior generations, but it comes with some extra features, hence a new > > compatible string is needed. > > > > Signed-off-by: Thierry Reding > > Signed-off-by: Mikko Perttunen > > --- > > Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.yaml | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.yaml b/Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.yaml > > index 41cea4979132..15706d2a808d 100644 > > --- a/Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.yaml > > +++ b/Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.yaml > > @@ -16,6 +16,8 @@ properties: > > - enum: > > - nvidia,tegra20-pwm > > - nvidia,tegra186-pwm > > + - nvidia,tegra194-pwm > > + - nvidia,tegra264-pwm > > I think this was lost during the earlier conversation we had on the > split of these patches. Krzysztof had pointed out that tegra194-pwm is > now a duplicate entry. I don't know exactly how it ended up like this, > but I'm pretty sure what I meant was: > > - items: > - const: tegra264-pwm > - const: tegra194-pwm > > This mirrors the fact that this is in fact backwards-compatible with > Tegra194 but also has additional features that we need the Tegra264 > compatible string for. If the devices are compatible. You have quite a lot of differences in the driver, so the question is whether driver will work fine when bound via old interface. This was EXACTLY explained in DTS101 last year. I really focused on that because after repeating for few years and two previous speeches people still claim compatibility is something else. :( Best regards, Krzysztof