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 D9EA313D503; Wed, 27 Nov 2024 18:27:35 +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=1732732056; cv=none; b=qjcgBhyoyVC+GBKRuev7jRZknquc802GSkf+M1K7lHUWY5p5uKx3/v96+SY7KxG2rtkn46YpvYXDKSsk5zTZs/eZqVycfu6d9BOkHukCtfp1reJ8T1UaFqW4xIQNRTUacC2RYIiSaDCNBJ7GiSGgF3q04riXdvZ4fcpciHnpsNA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732732056; c=relaxed/simple; bh=lKCISMfUMTDAUqkuaB/QeRcHlA/aD3hqMLJncaeT/WM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=HfoosC22tvoytKfcbsuvUIRM4Wj7WyhWO1bHtxbuEeEmpNlVkhRNhZ4hlM9zGMT3b0GLa1irdJ+U1t0rqko/fbQQx5wFTV/03XKCiwwDd3EVbiuFzyvKBosRv3jw6dOhrFNA+/YzOnlFYAfvsUeLFXqDCVVYZchdtJzluu8X1D4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=iVpwL7me; 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="iVpwL7me" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 639D7C4CECC; Wed, 27 Nov 2024 18:27:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732732055; bh=lKCISMfUMTDAUqkuaB/QeRcHlA/aD3hqMLJncaeT/WM=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=iVpwL7meTkSjhL95/clsXixNLScc7w0dhGWRMxEE9d4Mq+mvksM1B1FmcVhYTqpUh iAj0QDuZxiQpXu62e6IrMR1vWX1gsmW0fWZ02jzB2gSBLAweF5nP7MFspyoTYuo6aD LyjAqDYnORNf3VYZxkamHPvTPk1VABdZSLcLVdUF6IK64P2PfgyPPPcP4bTUeWUA1p yf0JJzlH1hF48tFywAXPAYKyBvCXOUD9HLSuiKcyG7rpwbECnB3ZUI2D5r3ilWLeo6 eWLE1GdVnIiRQi1o1UrtVmgvYFVDsAZtd/UzonSqc6R+Xhh/wg9l+exve9g+1rDHfZ tt1nNDe1pVNnA== Message-ID: <0ba0f4af-5075-4bb1-a7f6-815ef95bbda7@kernel.org> Date: Wed, 27 Nov 2024 19:27:27 +0100 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH V6 3/4] dt-bindings: interconnect: Add generic compatible qcom,epss-l3-perf To: Dmitry Baryshkov , Rob Herring Cc: Raviteja Laggyshetty , Georgi Djakov , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio , Odelu Kukatla , Mike Tipton , Sibi Sankar , linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20241125174511.45-1-quic_rlaggysh@quicinc.com> <20241125174511.45-4-quic_rlaggysh@quicinc.com> <20241127142304.GA3443205-robh@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 27/11/2024 17:53, Dmitry Baryshkov wrote: > On Wed, Nov 27, 2024 at 08:23:04AM -0600, Rob Herring wrote: >> On Mon, Nov 25, 2024 at 05:45:10PM +0000, Raviteja Laggyshetty wrote: >>> EPSS instance on sc7280, sm8250 SoCs, use PERF_STATE register instead of >>> REG_L3_VOTE to scale L3 clocks, hence adding a new generic compatible >>> "qcom,epss-l3-perf" for these targets. >> >> Is this a h/w difference from prior blocks or you just want to use B >> instead of A while the h/w has both A and B? The latter sounds like >> driver policy. >> >> It is also an ABI break for s/w that didn't understand >> qcom,epss-l3-perf. > > As the bindings keep old compatible strings in addition to the new > qcom,epss-l3-perf, where is the ABI break? Old SW will use old entries, > newer can use either of those. No, this change drops qcom,epss-l3 and adds new fallback. How old software can work in such case? It's broken. Best regards, Krzysztof