From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 53CE2429822; Tue, 9 Jun 2026 13:56:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781013364; cv=none; b=aPCwT2sBPQfs90+i92RNzR6XEvhkqjOQFIs7dlD9KX9K0vl7PVpnAgnRg+hINDCFQq3vCWewoPl0DmYvckLLEosVgiNRahUztXWz4X/lp2J/0R366CQTDaIbVKrGWPlDwzXJFnLk4L7aB37JVFRLbjw25d4JaZtQNnG7eo3RRF8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781013364; c=relaxed/simple; bh=LdhH3eh4ry30WN4nXFG3wtkQTL+lh0BZ84LJ7nvZais=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=p1DfygIhPMvTCPkDMGwRIv0Z29tG+G5Up3/z1cXNxAj4L7S5ogqgS80af0xDCLVaVYCjBQ40swb2K3VD2WwpC44eejnTYrsCGBmTqU2bPGrUr/O/yYbnt7nbziqavBxX+9012mPiVQit1sD/oWG/AGsfqSk+D9yRoFwvXHTYh1Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lTAmPxTo; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="lTAmPxTo" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CBF6C1F00893; Tue, 9 Jun 2026 13:55:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781013362; bh=msW6kBHgK4dN/HktYSQeqMwkNiDWLxyDuHOad2yn7do=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=lTAmPxToKSXFH3heLxC9/qwuE6TzAVdcGOmd8hatZ3W0o6cPSlHdeJuDhJsakl/ut KlSfP1hLzzZ5Kym0ODt2cg8eFfZxZJ7V0cMBbeBQX7v1RaymY27SYycYelljr4sw3c 1YRirAKe2xHCLKqh5VnfhjLmh2NDJI8aXT2CakoM9+yX1x5wbkRBW+wBknzSDW440y JHTht7MmKdDQhKMOjLTbsHYNBdjKI1b2UmmC6U+AC/CBDZR/7QzslZcl7fOItK91dR go3Fn43uNZqwL1BBfvoFh/PRwWF46FHdnzYz+zH54T34L1SxRiV1y+hWtuCk5De9aX YHzVCZ0ygnHow== Message-ID: <245e1e8c-45e4-426d-9c0c-4c2c0952223b@kernel.org> Date: Tue, 9 Jun 2026 15:55:54 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 7/7] arm64: dts: qcom: mahua: Switch pcie5_phy ref clock to RPMH_CXO_CLK To: Konrad Dybcio , Qiang Yu , Bjorn Andersson , Michael Turquette , Stephen Boyd , Brian Masney , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Taniya Das , Konrad Dybcio Cc: linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, krishna.chundru@oss.qualcomm.com References: <20260527-tcsr_qref_0527-v4-0-ded83866c9d9@oss.qualcomm.com> <20260527-tcsr_qref_0527-v4-7-ded83866c9d9@oss.qualcomm.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 09/06/2026 15:06, Konrad Dybcio wrote: > On 5/28/26 4:29 AM, Qiang Yu wrote: >> PCIe5 PHY on Mahua gets refclk from CXO0 pad directly, so no QREF >> clkref_en voting is required. Override the clock list to use RPMH_CXO_CLK >> directly instead. > > This is the last piece of the puzzle that this series is missing. > There's no QREF clkref_en, but there is a refgen that needs to be > powered. For PCIe5 on Mahua this would be L2F_E0 (0p9) and L4H_E0 > (1p2). > > I think the easiest (laziest?) solution would be to add dummy clocks > in the clkref driver and only toggle the required regulators. Another > option is to defer back to individual drivers (such as PCIe QMPPHY). > > I kinda like the "one central node to drive power" approach, but I'm > not sure others agree, since it stretches truth just a tiny bit > (although not as much as one would think since there are *some* > controls for the transparent-to-the-OS hw pieces in these paths still > in TCSR).. Dmitry, Krzysztof, would you object to that? Not sure what you ask here... the tcsr will get the refgen supplies and that's all what is needed from DT. Best regards, Krzysztof