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 BCA41DDA8; Mon, 21 Oct 2024 06:32:47 +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=1729492367; cv=none; b=L6f4GmhV5qpJeehwE4EM1lbvaohqeVLeIEonj8tpXeX3EMayntjQvCZGr0fwk7LT6SBhTmJWgAvUswyvdrT5NMOUMT/Xga+wNEzXc//wA/H95ViRPLHdHKXmAmwlFV9x9y7s+wWwb+BOM4K9QcUaLT5fThOyItTl9U+ASx6e5bI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729492367; c=relaxed/simple; bh=zpa4Fatg54DYqfk5OKylbowe0195Hg2MiUo5EvTyIxU=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=AfA6bkPjc5O0eT9XGzAKmxqufgpIzyM/EtXZV/flaUGJPhJoZsPoz9bbdM7UnQ1c8mWHzTc3dzfGz/27KGDQVHkGQdf4qBD7RDrtT+2T0XTX4wSM/P9ZCNUlgBqK+PVyfchzUJQuwrUoAmyYjlJnP/Ksmc21zGEcMlLjg0g4rKk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=TwOAlGvI; 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="TwOAlGvI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C21DAC4CEC3; Mon, 21 Oct 2024 06:32:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729492367; bh=zpa4Fatg54DYqfk5OKylbowe0195Hg2MiUo5EvTyIxU=; h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=TwOAlGvIimmLdmkiDg5An7a7QN2gYBWQlH7uQ4T4SYgv0YNzvllK6AFyh2ShcFSuL D6kmQ5cncjwb0XIeVeONMgieydjPXjnQOwz8LTZB6efQycibaJ9EtLpSDifaAJMKCs DKbaPauZLfevKN8FrlE9HBj3FsvSrjcujGqPl2TgLwrRPwNkjF0V3Pd0Ssqy3dPdpP eVocuS52+J6pgmOscGh0QBH/QhAvdw/xMO4uTKF1O3YjsHmnaxuRYWRfHPmew0eUcR C9ugl0PgbhXvvubwTsGAFv8XqaNT+x8AY/CteGS02v/nhk327dyQPjvrGi5k8qhNAE i/SFtJKrcJDMw== Message-ID: <119e86e4-acb4-455d-9b0b-ee851b621c91@kernel.org> Date: Mon, 21 Oct 2024 08:32:40 +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 v3 1/3] dt-bindings: pinctrl: Add support for Amlogic A4 SoCs From: Krzysztof Kozlowski To: Jerome Brunet Cc: Xianwei Zhao , Linus Walleij , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Kevin Hilman , Martin Blumenstingl , Bartosz Golaszewski , linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org References: <20241018-a4_pinctrl-v3-0-e76fd1cf01d7@amlogic.com> <20241018-a4_pinctrl-v3-1-e76fd1cf01d7@amlogic.com> <4a79f996-9d82-48b2-8a93-d7917413ed8c@kernel.org> <1jttd9rein.fsf@starbuckisacylon.baylibre.com> <4127b448-a914-4c69-b938-29512995326f@amlogic.com> <1jmsj1rclh.fsf@starbuckisacylon.baylibre.com> <1jiktpr40d.fsf@starbuckisacylon.baylibre.com> <8cb615cf-1b4e-49ba-91fc-6e1f5f57cd3c@kernel.org> Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 21/10/2024 08:31, Krzysztof Kozlowski wrote: >>>> >>>> reset-gpios = <&gpio 42 GPIO_ACTIVE_LOW>; >>>> >>>> And others will go in the driver to see that is maps to GPIOX_10 ? the number >>>> being completly made up, with no link to anything HW/Datasheet >>>> whatsoever ? >>>> >>>> This is how things should be done now ? >>> >>> Why would you need to do this? Why it cannot be <&gpio 10 >>> GPIO_ACTIVE_LOW>, assuming it is GPIO 10? >>> >>> Bindings have absolutely nothing to do with it. You have GPIO 10, not >>> 42, right? >> >> That's what being proposed here, as far as I can see. >> >> GPIOX_10 (not GPIO 10) maps to 42. If this goes through, for DTs to be >> valid in any OS, all need to share the same definition. That looks like >> a binding to me. >> >> On these SOC, gpios in each controller are organized in bank with >> different number of pins. So far, this was represented as single linear >> array and that was not a problem since the mapping was part of the binding. >> >> Are you suggesting 2 params instead of one ? something like this maybe ? >> >> reset-gpios = <&gpio BANK_X 10 GPIO_ACTIVE_LOW>; > > No, I propose the same as you wrote: > <&gpio 10 GPIO_ACTIVE_LOW> > > but I don't mind putting bank there. > >> >> This means this A4 controller will be software incompatible with the >> previous generation. It will need to handled differently eventhough the >> HW is exactly the same. >> >> Note that some form of binding would still be required to define the >> banks which are referenced by arbitrary letter in doc, not numbers. > > Usually banks are considered separate gpio controllers, so numbering > always start from 0 because phandle encodes the bank. > > And this is exactly what Rob already asked in v1 review. Ha, actually I misread his reply, I think he proposed your syntax: <&gpio BANK_X 10 GPIO_ACTIVE_LOW> Best regards, Krzysztof