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 737241531CD; Fri, 30 Aug 2024 11:03:54 +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=1725015834; cv=none; b=eR4Q422NF3IOHYiS60qPEGIESMscRZvtw/7AL5iIKEoePFq/EWdRVNe46CTClMZ6WP4+UUynYwwFoihf6fqylKvh3PggJXzNNuC3fqa8ud5YrGZCN4bIG+O6RnhycPTUpm84XKjVr6OD8imDr9l2Q4SioDpD3Hc2omYG7CSl6bQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725015834; c=relaxed/simple; bh=usFsqN8rw6jJgzE3LoXO1ibr/w7v/sbbk6GzQgZo84s=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=UCe89kGG0KqSQb+61UF0X87w9r/wgPFT7raB4JjCOgbWOV12bgQd5Mp+x6PSqn3iYBxPViQJLJXwJjs1tCwP/AL+llY2Rdr0RWa9lZJXljaWiL89oHTpLjM+YTlKeESmQW7e4Ijy/NZrXNbgIbHi3xBSKxoJMwdurjMhx/jUzhg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=h4Pelg4O; 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="h4Pelg4O" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 729DBC4CEC2; Fri, 30 Aug 2024 11:03:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725015834; bh=usFsqN8rw6jJgzE3LoXO1ibr/w7v/sbbk6GzQgZo84s=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=h4Pelg4OuZmSA+H86fQvajI5AX/6qqQwKsU/N0SkPzu8x7Qv6XnYd0tO0fKZM8dtG 5OqqQ7YrT00eEyzkCd8+8kGcK07XgHLnFEQozGB+RS56vrwWjTDLLrX2jJ5wGHiG/T 6ZURzv67kaNMHHQ7RnWe+qlXsD40z1eQrTfqa7EtstMZyYRXqbE/9U7d5XQ+XTEAm0 2uJSYRnDIS6MyYsd9k4RYh6K3U5x6sfXbKUM8nwnVKjB6BNK3dH6XGCNo/13wuEVcu wvfpJvIrCs6oTlOosRd29bpl11gPAkhkxpzaatMlsKuKQ0OPnr4nPvLexVSlFWqVkP u4p9trkLVAJmw== Message-ID: <09aa43d6-9e8c-4f6e-ab49-dc4a9571e832@kernel.org> Date: Fri, 30 Aug 2024 13:03:46 +0200 Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/2] dt-bindings: pinctrl: airoha: Add EN7581 pinctrl controller To: Conor Dooley , Lorenzo Bianconi Cc: Christian Marangi , Rob Herring , Lorenzo Bianconi , Conor Dooley , Benjamin Larsson , Linus Walleij , Krzysztof Kozlowski , Conor Dooley , Sean Wang , Matthias Brugger , AngeloGioacchino Del Regno , linux-mediatek@lists.infradead.org, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, upstream@airoha.com References: <66c8c50f.050a0220.d7871.f209@mx.google.com> <20240826-kinsman-crunching-e3b75297088c@spud> <66ce1b04.df0a0220.a2131.6def@mx.google.com> <66d187f1.050a0220.3213d8.ad53@mx.google.com> <2c9aafdd-000b-4e8f-b599-4f57e7eb0ca7@kernel.org> <20240830-payphone-unexposed-75eed532c14d@wendy> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 30/08/2024 13:01, Conor Dooley wrote: > On Fri, Aug 30, 2024 at 12:55:32PM +0200, Lorenzo Bianconi wrote: >> [...] >> >>>>>> >>>>>> Hi Rob, thanks a lot for the hint, I hope we can finally find a solution >>>>>> on how to implement this. >>>>>> >>>>>> In Documentation the block is called GPIO Controller. As explained it does >>>>>> expose pinctrl function AND pwm (with regs in the middle) >>>>>> >>>>>> Is this semplification really needed? It does pose some problem driver >>>>>> wise (on where to put the driver, in what subsystem) and also on the >>>>> >>>>> Sorry, but no, dt-bindings do not affect the driver at all in such way. >>>>> Nothing changes in your driver in such aspect, no dilemma where to put >>>>> it (the same place as before). >>>>> >>>> >>>> Ok, from the proposed node structure, is it problematic to move the >>>> gpio-controller and -cells in the pinctrl node? And also the pwm-cells >>>> to the pwm node? >>> >>> The move is just unnecessary and not neat. You design DTS based on your >>> drivers architecture and this is exactly what we want to avoid. >>> >>>> This is similar to how it's done by broadcom GPIO MFD [1] that also >>> >>> There are 'reg' fields, which is the main problem here. I don't like >>> that arguments because it entirely misses the discussions - about that >>> binding or other bindings - happening prior to merge. >>> >>>> expose pinctrl and other device in the same register block as MFD >>>> childs. >>>> >>>> This would be the final node block. >>>> >>>> mfd@1fbf0200 { >>>> compatible = "airoha,en7581-gpio-mfd"; >>>> reg = <0x0 0x1fbf0200 0x0 0xc0>; >>>> >>>> interrupt-parent = <&gic>; >>>> interrupts = ; >>>> >>>> pio: pinctrl { >>>> compatible = "airoha,en7581-pinctrl"; >>>> >>>> gpio-controller; >>>> #gpio-cells = <2>; >>>> >>>> interrupt-controller; >>>> #interrupt-cells = <2>; >>> >>> No resources here... >> >> ack. iiuc, all the properties will be in the parent node (mfd) and we will >> have just the compatible strings in the child ones, right? Something like: >> >> mfd@1fbf0200 { >> compatible = "airoha,en7581-gpio-mfd"; >> reg = <0x0 0x1fbf0200 0x0 0xc0>; >> gpio-controller; >> #gpio-cells = <2>; >> >> ... >> #pwm-cells = <3>; >> >> pio: pinctrl { >> compatible = "airoha,en7581-pinctrl"; >> }; >> >> pwm: pwm { >> compatible = "airoha,en7581-pwm"; >> }; >> }; > > > Didn't Rob basically tell you how to do it earlier in the thread? > What you've got now makes no sense, the compatibles only exist in that > to probe drivers, which you can do from the mfd driver with > mfd_add_devices() or w/e that function is called. Yep, we are making circles. I will repeat: "The move is just unnecessary and not neat. You design DTS based on your drivers architecture and this is exactly what we want to avoid." Best regards, Krzysztof