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 E29D313AF2; Tue, 7 Oct 2025 01:14:20 +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=1759799661; cv=none; b=lEX15J2vda5K5Q20ImEmbQPeL7KduiQxbcuslYcxKQYSDffdDkum+mRQq397qI+ocIDtKS5X0vwpHD2kXZ/ERVYDUn5JkhG7AsdAP5JKxVyTzaI/3wU7udu5ze54ZTuLUeGZ8J6gBfaX/7BlFXbec64txovmfbQ5gBkSRaAXhsc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759799661; c=relaxed/simple; bh=tbDITsoSGRPsOcqxA2EA0aJKGkYbrUNq2vw4X1lzn0Q=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ahBKuMdF5iFJnRb+b4T2SOF85wQIKjuhkCC/M6IVlROVJ8tOGxWW0HzsXS+VEFBfsdsW1Inr3OZt0gWCjwZRDr+pB61ZQNwvyt9XN06uwQpwlUeS1ncDvaYURfu1pJ/ifKvTEv+14r0G7JUev75fge8Q3R3BQyzacX8AlFarDOI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Lm7amN5j; 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="Lm7amN5j" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2EF47C4CEF5; Tue, 7 Oct 2025 01:14:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1759799660; bh=tbDITsoSGRPsOcqxA2EA0aJKGkYbrUNq2vw4X1lzn0Q=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=Lm7amN5jZqGrJfdHU0CYEuMWQAqOEwQWcIkhsC1/7VzOJr8BjiR3c9a9lnUXrTEMJ dbfeNuRpp5IraUmdKT61Vm6sjIlHMM1Fv4VcXQUYiHjaNUUGvJzoMfU+rdh5ULAn9q /J701I6poJWBR6NvuYPcLOIGpYz8bkx8zmLvAXETzefgv940gNL6Teibz4Z8Inf409 D0chOh+GdkVouMBEqQmMujs3KWcw54bVT3oeoNoW6a84ZZ/E3HUqDVVtrPSjCLuOly dUkcPxIGZTz08Y3OcjqDRZ/M3wMlPNUa+iqJEqTki2z6Bv5+KFlndhW+HZNNTAUEVa Kkswn4B0bSnSQ== Message-ID: <64dd0bab-6036-4e06-aff5-b0f86a167ada@kernel.org> Date: Tue, 7 Oct 2025 10:14:14 +0900 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] gpio: of: make it possible to reference gpios probed in acpi in device tree To: Bartosz Golaszewski , Markus Probst Cc: Linus Walleij , Mika Westerberg , Andy Shevchenko , linux-gpio@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org References: <20251002215759.1836706-1-markus.probst@posteo.de> <7f4057f25594ac3b50993a739af76b7b1430ee6a.camel@posteo.de> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 03/10/2025 17:51, Bartosz Golaszewski wrote: > On Fri, Oct 3, 2025 at 10:40 AM Markus Probst wrote: >> >> On Fri, 2025-10-03 at 10:03 +0200, Bartosz Golaszewski wrote: >>> On Thu, Oct 2, 2025 at 11:58 PM Markus Probst >>> wrote: >>>> >>>> sometimes it is necessary to use both acpi and device tree to >>>> declare >>> >>> This is a rather controversial change so "sometimes" is not >>> convincing >>> me. I would like to see a user of this added in upstream to consider >>> it. >>> >>>> devices. Not every gpio device driver which has an acpi_match_table >>>> has >>>> an of_match table (e.g. amd-pinctrl). Furthermore gpio is an device >>>> which >>> >>> What is the use-case here because I'm unable to wrap my head around >>> it? Referencing devices described in ACPI from DT? How would the >>> associated DT source look like? >> In my specific usecase for the Synology DS923+, there are gpios for >> powering the usb vbus on (powered down by default), also for powering >> on sata disks. An example for a regulator defined in DT using a gpio in >> ACPI (in this case controlling the power of on of the usb ports): >> >> gpio: gpio-controller@fed81500 { >> acpi-path = "\\_SB_.GPIO"; >> #gpio-cells = <2>; >> }; >> >> vbus1_regulator: fixedregulator@0 { >> compatible = "regulator-fixed"; >> regulator-name = "vbus1_regulator"; >> regulator-min-microvolt = <5000000>; >> regulator-max-microvolt = <5000000>; >> gpio = <&gpio 0x2a 0x01>; >> }; >> >> - Markus Probst >>> > > Krzysztof: Could you please look at this and chime in? Does this make any sense? There is no such property as acpi-path and I don't see here any ABI being documented. Nothing in dtschema, either. Nothing in DT spec. I also did not receive this patch. Actually - nothing from markus.probst@posteo.de in mail mailbox. So no clue what is this about, but if you want to use undocumented property then obviously no. Best regards, Krzysztof