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 E1052198A11; Fri, 11 Jul 2025 08:44:26 +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=1752223467; cv=none; b=tAvxNFT7/CoA9Ffp6dqTOY6cFJOBg8WBkv+uE1MkLDR4xShnu4rl3lQprZAg1WsgFeIHivVEumkKW5j5IH3JDvoNGIt7CZY3OJChSyd3Q/MACd4hu9FkBENhtwW8w1tzowOaP++6Soc41LvFvhlQpjmV1W5XEE70UyhvJdDfvxk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752223467; c=relaxed/simple; bh=5u0xj9NoUVsjv0Gy6s3BT/+6Ahjt0e6gF5rqU2CiDrw=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=IFCFO5tpVA3KhFt3gh2fvJDPBo1Oc6oXtRC5/kmYFXEIBdYn28kjroRypRleqrcUn/bSIEyDfMP3bQCbLmZVnelbVUOpb501afEQobLSJD46eJsI6hIzFGJ+knFhD9klKve7D/23jOjcX/fyzGFBFxkHWfgk7+GnF7FpRHc1LNc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=O46v/df6; 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="O46v/df6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3B9FDC4CEED; Fri, 11 Jul 2025 08:44:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1752223466; bh=5u0xj9NoUVsjv0Gy6s3BT/+6Ahjt0e6gF5rqU2CiDrw=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=O46v/df6c2XPGTJKd946K0NJ/vsmd7HWlMvN6x+FIjeY17v+fXAD9qNpQw2hTh4Fb N2IzoxLR7QPNf7FWNquvQsAqKx42Wo1EWsessKwwzwRfX6hpcRAElOmEtWhDDKZda5 ghnNOvFZPjFseLUiijjSZSnC7a+NCyAajwZOj6TA/ljqCnCYG5yxpTWlahvC4tSLE0 aKXBc1JKy5UcGEDCvuVYXXHZCnFFQO+mQFGuqFmJT9Tb+Wmlwk3X8/SWulW1RQ+GBh wXlAM/hcOaBQv0NVbAufHT22P+rRR/uEXyS+UJVjnz5NdjWw4tgSd+4cLavC7xw++e +Up+5UohaPmpg== Message-ID: <1606591b-5707-48bf-8f60-44063ecf8f1a@kernel.org> Date: Fri, 11 Jul 2025 10:44:11 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/4] dt-bindings: PCI: qcom,pcie-sa8775p: document link_down reset To: Ziyue Zhang Cc: andersson@kernel.org, konradybcio@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, jingoohan1@gmail.com, mani@kernel.org, lpieralisi@kernel.org, kwilczynski@kernel.org, bhelgaas@google.com, johan+linaro@kernel.org, vkoul@kernel.org, kishon@kernel.org, neil.armstrong@linaro.org, abel.vesa@linaro.org, kw@linux.com, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-phy@lists.infradead.org, qiang.yu@oss.qualcomm.com, quic_krichai@quicinc.com, quic_vbadigan@quicinc.com References: <20250625090048.624399-1-quic_ziyuzhan@quicinc.com> <20250625090048.624399-3-quic_ziyuzhan@quicinc.com> <20250627-flashy-flounder-of-hurricane-d4c8d8@krzk-bin> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/07/2025 10:26, Ziyue Zhang wrote: > > On 6/27/2025 3:08 PM, Krzysztof Kozlowski wrote: >> On Wed, Jun 25, 2025 at 05:00:46PM +0800, Ziyue Zhang wrote: >>> Each PCIe controller on sa8775p includes 'link_down'reset on hardware, >>> document it. >> This is an ABI break, so you need to clearly express it and explain the >> impact. Following previous Qualcomm feedback we cannot give review to >> imperfect commits, because this would be precedent to accept such >> imperfectness in the future. >> >> Therefore follow all standard rules about ABI. >> >> Best regards, >> Krzysztof > > Hi Krzysztof > > > This does not break the ABI. In the Qualcomm PCIe driver, we use the APIs > devm_reset_control_array_get_exclusive, reset_control_assert, and I see in the binding requirement of 1 reset before and after your patch: requirement of two reset lines. This is an ABI change. My entire comment stays valid, so don't just deflect it but resolve it. Best regards, Krzysztof