From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5F9A4D2FFFA for ; Fri, 18 Oct 2024 15:32:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=VcQe7vm8kjEnK2Fgt+n0B9SG8pAHbmWTNtIj605DJ/g=; b=vG9Ly37Ad4hvc7 x/PR0NBDXAHfiVywSCcatcIH3yhslGS8E3BFGHLUyrzGn3LNHfV8yFGX839VedvoHtXGoZm85qiBe 0DVFHtGP5TUY7lEpn6aHRXlxYLLrxFeiaoHPEsb1P9mjb5x5fLehV6reYZ5Nrp+QeB/ydLmDIDQe4 Mi+IbmykI/m365Pa9uxml+su4R3bnYuP0mMAymwK0q4GqUVigd7is+CtLRAzy8tzj3SeZTIvku338 iL5DB/rOBwgOXeUgBetML2FmI+MrYn4k9ArjJfjQTvxbGN23lU8hvSMg7lqZp474cVb7ciPnsgdC7 HZnoSs8FWTa98kBK0Fnw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t1oxI-00000001CYe-3tHp; Fri, 18 Oct 2024 15:31:57 +0000 Received: from nyc.source.kernel.org ([147.75.193.91]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t1oxG-00000001CYE-3NMT; Fri, 18 Oct 2024 15:31:56 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id AF30DA4425D; Fri, 18 Oct 2024 15:31:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BDD44C4CEC3; Fri, 18 Oct 2024 15:31:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729265513; bh=IdmLrmq9YvegyhJcScfze8kc18IhbrRoMhwMjSgkHdg=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=HmloXEX6XQGmwMYXkxJqY6mVDxqipivufVv0adnktuaqNsbD8rcc6W1NrbmCS1Szs Qy2FsdDoFUhhFrgbyOu8ILtQ46gAvMgJzKIU/6qAeTZA7wMIwa48utXZGwzmUrhy28 n4hmD0Qxx3UmUIrBEwv2FtIu3rT+7rGmfICd/axDDQqBmuj6D45Kf65HCo8+EaRIB8 qLWFQVsIXmbAD1NCA/x8Oh4YSlt0QZ1fyP5IBxUw3xRDEgyuN9YyN5rVxtPuj8Pbu6 cZNEZcOZAN2glQmsz9dfFAJGiru6RV6VxY2DYO25P0JnQb6eRSBkuFGHHqeMPsqV+l zXYrwkAxW+6oQ== Message-ID: Date: Fri, 18 Oct 2024 17:31:45 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/3] dt-bindings: pinctrl: Add support for Amlogic A4 SoCs To: neil.armstrong@linaro.org, Jerome Brunet , Xianwei Zhao Cc: Linus Walleij , Rob Herring , Krzysztof Kozlowski , Conor Dooley , 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> <5ad8f396-84a5-486d-b90d-98fbf8882d1b@linaro.org> Content-Language: en-US From: Krzysztof Kozlowski Autocrypt: addr=krzk@kernel.org; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org On 18/10/2024 14:31, Neil Armstrong wrote: > On 18/10/2024 12:13, Krzysztof Kozlowski wrote: >> On 18/10/2024 11:20, Jerome Brunet wrote: >>> On Fri 18 Oct 2024 at 17:01, Xianwei Zhao wrote: >>> >>>> Hi Jerome, >>>> Thanks for your reply. >>>> >>>> On 2024/10/18 16:39, Jerome Brunet wrote: >>>>> [ EXTERNAL EMAIL ] >>>>> On Fri 18 Oct 2024 at 10:28, Krzysztof Kozlowski wrote: >>>>> >>>>>> On 18/10/2024 10:10, Xianwei Zhao via B4 Relay wrote: >>>>>>> From: Xianwei Zhao >>>>>>> >>>>>>> Add the new compatible name for Amlogic A4 pin controller, and add >>>>>>> a new dt-binding header file which document the detail pin names. >>>>> the change does not do what is described here. At least the description >>>>> needs updating. >>>>> >>>> >>>> Will do. >>>> >>>>> So if the pin definition is now in the driver, does it mean that pins have >>>>> to be referenced in DT directly using the made up numbers that are >>>>> created in pinctrl-amlogic-a4.c at the beginning of patch #2 ? >>>>> >>>> >>>> Yes. >>>> >>>>> If that's case, it does not look very easy a read. >>>>> >>>> >>>> It does happen. The pin definition does not fall under the category of >>>> binding. >>>> >>>> https://lore.kernel.org/all/106f4321-59e8-49b9-bad3-eeb57627c921@amlogic.com/ >>> >>> So the expectation is that people will write something like: >>> >>> 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? > > There's no 1:1 mapping between the number and the pin on Amlogic platforms, > so either a supplementary gpio phandle cell is needed to encode the gpio pin > group or some bindings header is needed to map those to well known identifiers. So I assume this is not linear mapping (simple offset)? If so, this fits the binding header with identifiers, but I have impression these were not really used in earlier versions of this patchset. Instead some offsets: https://lore.kernel.org/all/20241014-a4_pinctrl-v2-1-3e74a65c285e@amlogic.com/ and pre-proccessor. These looked almost good: https://lore.kernel.org/all/20240613170816.GA2020944-robh@kernel.org/ but then 0 -> 0 1 -> 1 so where is this need for IDs? See also last comment from Rob in above email. Best regards, Krzysztof _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic