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 6F77F1459FA; Mon, 23 Mar 2026 14:45:03 +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=1774277103; cv=none; b=VozmsCU007nwCS+v1GHYTaEG/jqDXuK+iY8TBdVUoMJpeIZYNLZBxQNrjKnUxB33lMD1oKSGghVxB0CC4e+BxmIdywbX6LFuWr8YmxWISXb8g4OC2Jwd1gtxo9FmDU3yJQaJkQW4FqtKvXJ9dY3PJt2yG3vHn8GDXSY3jCmutrs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774277103; c=relaxed/simple; bh=AMsHMdA+1ENOpjDo1x/BafeNv4x5LgPVJV/XXUHUyC0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=uL5B0n1PwotxcqUnLEifvBMCZN07hMieMp1Qh7VnmrmqGTvc5apFG0i1bEYn0ksM6jtuAoZdytyYsbf3K73uFpnmAQMKBhQMSEPSYH+G+MBnnOQ2Em0PVmo3090fCcf7+5GEiVapNjK8NV3yZA7POtbCpq70TB5FjIcxtmbq6a8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gS+9M2ub; 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="gS+9M2ub" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D2777C4CEF7; Mon, 23 Mar 2026 14:45:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774277103; bh=AMsHMdA+1ENOpjDo1x/BafeNv4x5LgPVJV/XXUHUyC0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=gS+9M2ubAQMlNkOsYlqf66ywjcBYELCZYK7whLIyeN2QGJqhC9gWNKpznKMvup/27 XtvFey5bCv/cDxRLWfAAUj/ObwtzAMuWLg3oYgS5dhtPdtOeYCi7JqMkvrqRieKH4r /oP3a+EMKKqBQcbNkddiX8T500vJER4uW+WHzpYpn++/L/fMA6y0VO9n1jv5+3V8Z6 aNXr/DPXcc9mU9ykrOP2u0QbXeQe14wrKKeexD6IBS2D4rSULDt8/Y1n0mm8K+/3vM 9bJN360CR3GRVhHfeysHviD2IyGWkTLMGYQoJqU4g41pfsagmMNosy+WoHPPKlIiH1 Q+2XpMBEXkRZw== Date: Mon, 23 Mar 2026 15:45:00 +0100 From: Thierry Reding To: Krzysztof Kozlowski Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jon Hunter , devicetree@vger.kernel.org, linux-tegra@vger.kernel.org Subject: Re: [PATCH 1/2] dt-bindings: pwm: Document Tegra194 and Tegra264 controllers Message-ID: References: <20260320234056.2579010-1-thierry.reding@kernel.org> <20260321-witty-fortunate-elephant-ce50fe@quoll> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="bj2jq6boulfkimbn" Content-Disposition: inline In-Reply-To: <20260321-witty-fortunate-elephant-ce50fe@quoll> --bj2jq6boulfkimbn Content-Type: text/plain; protected-headers=v1; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH 1/2] dt-bindings: pwm: Document Tegra194 and Tegra264 controllers MIME-Version: 1.0 On Sat, Mar 21, 2026 at 11:47:59AM +0100, Krzysztof Kozlowski wrote: > On Sat, Mar 21, 2026 at 12:40:55AM +0100, Thierry Reding wrote: > > From: Thierry Reding > >=20 > > 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. >=20 > Extra features means devices are compatible. >=20 > You also always need a new compatible even without extra features, so > last part is just confusing. Suggests like you could skip new > compatible. Erm... if the hardware was exactly identical, then there'd be no need for a new compatible string. It's certainly good practice to add one anyway, but what's the point in having 10 different compatible strings for exactly the same hardware? In this case the new compatible string is necessary so that we can take advantage of the new features that are not covered yet by an existing binding. 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