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 5C3562676E9; Thu, 24 Jul 2025 14:38:19 +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=1753367900; cv=none; b=JmHcScdsEWlS4i0gK+5XJKbasOU/lZh1geAYTjyV61F/2bVqCEmBKXLIQkgdO/K8UT+Xn8LQDWxH2vdNRICGkaWBp21HotjzzanGQ5kVD0eNM5Gj5voyz5vrabavm61tmxdKGlwcbe/tsv3ofD8qjPTy7JZuuMfvDXWwaMG5k0Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753367900; c=relaxed/simple; bh=J+2CIa+PZT6ZTjOXWq7tTssnqG+kDDgqLvO7Suiluns=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=BDCD59d7bye5Qb23HLAfbxG/3Lz8WbD5YNRTIqWsISmKH67K600aNlGMC4zdgM1TkfRTVounQkTfZcxOn+SLzoAlFChrpkShBivrBBk3H57zHmyShU2XOmFMEgrlSV2FgCQP5MgFEEevYpHYhK0CHvp/qBeX4JP/wgU/cwe7PFM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HsTFWnGt; 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="HsTFWnGt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 49ADFC4CEED; Thu, 24 Jul 2025 14:38:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1753367899; bh=J+2CIa+PZT6ZTjOXWq7tTssnqG+kDDgqLvO7Suiluns=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=HsTFWnGtUktymKD/MzWoKPp9mMJ8J7hdPiYRwnH/gX9Yyk0YWoi1zQuKcwMKkqmTZ U4ENjChvi76/4WavXvO4QCBxC+2/YMObnfkttI8vQEU8YE6ce1JGsY+nABrE8iT1N5 fsvrjy6Sxq4P7KFt0/HSAoKCCJm7TauRFzfFrz6pICC7V4MzcBlBoLnlO+UYMVH66T vWl/Xg2sk05tWJpYL02rUUx+Ym3KdwHC0Fni5rYKRSUMQJ3cdo5OA+RLTP9X2GeOVi gcc4BWEYQEwm7naAtF2czbFwmrqIiUbUyKnYg8p7mp1iHOkqkI4XCi0RqrKtP3/AuB ILa9KQXLxxcXg== Message-ID: <217dfc7f-97d6-4598-ad6a-1cb48464c91c@kernel.org> Date: Thu, 24 Jul 2025 16:38:11 +0200 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 v12 0/8] Implement vendor resets for PSCI SYSTEM_RESET2 To: Shivendra Pratap , Florian Fainelli , Bartosz Golaszewski , Bjorn Andersson , Sebastian Reichel , Rob Herring , Sudeep Holla , Souvik Chakravarty , Krzysztof Kozlowski , Conor Dooley , Andy Yan , Mark Rutland , Lorenzo Pieralisi , Arnd Bergmann , Konrad Dybcio , cros-qcom-dts-watchers@chromium.org, Vinod Koul , Catalin Marinas , Will Deacon Cc: Dmitry Baryshkov , Mukesh Ojha , Stephen Boyd , Andre Draszik , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, Elliot Berman , Srinivas Kandagatla , Elliot Berman , Konrad Dybcio References: <20250721-arm-psci-system_reset2-vendor-reboots-v12-0-87bac3ec422e@oss.qualcomm.com> <56599da9-0200-72b5-012e-942a1fc954b2@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 24/07/2025 16:04, Shivendra Pratap wrote: >>>> For the sysfs bits, should not we be seeing "psci" instead of "reboot-mode" twice in this path: >>>> >>>> # cat /sys/class/reboot-mode/reboot-mode/reboot_modes >>>> powercycle >>> As per current patch, we create a class named - "reboot-mode". >>> /sys/class/reboot-mode >>> >>> Then comes the DT node name of the registering driver. >>> /sys/class/reboot-mode/
/ >> >> This means that node name becomes part of the ABI? I am not happy about >> it. Where is such ABI documented? Because your last patch tells >> something completely else! >> >> I strongly insist using compatible as way to find your device, not node >> names. > It will look better to switch to compatible. Will define a compatible for > psci reboot-mode binding and align the patch to use the compatible for sysfs. > Current patch defines reboot-mode as a property to psci, hope its fine to > define a compatible for this property like "psci-vendor-reset" or > "psci-reboot-modes"? Hm, sorry, what? That's not what I ask, but considering inconsistency mentioned here and in actual ABI document I do not even know what to suggest. > >> >> In any case you need to document such ABI in Devicetree bindings, >> because sysfs ABI is not enough. > should reboot-mode Devicetree binding document this ABI? Can you > please share some more detail on this? The binding for the device, whose node name you are using here as ABI, should document the ABI. Best regards, Krzysztof