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 F35A7CD4F54 for ; Wed, 20 May 2026 07:08:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type: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=5sJis8pObID1kGXbTsB3IgBpTH0zVnG6Ljg/eY2IOOw=; b=Q2RYzTRWlw2ez0sX/P1+nEJjtL Kz+fSuaIIERqKdNAdtGG/tOGTWpiiOsrq3y4jRkxXxQ0lQLI7CR96wt1RDCOwfuGKbC856LwYhjYs RL08+OSXibgf7bhp8QGoy/rR3G/nHKxGs1HgW1BpXSpvjDhYU7Vn4Iev7TrVn87CudjjlsuWVAxoE zh6Vb9+dKtjYEoKYXhi4gjtNY2NyrfEsir2pm3tzWx8t6lxdbn6JK6HBkwHOCe+/T1W43koPRdNyp V3v/y4S04WotAhhWRViRPPWK6Wvenzc5hmEHv/zqtiKN691uHuLsCNXlFcCPBZlxtnAf5A7SwVpsE a2EzWzPw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPb2x-00000003kq3-17VB; Wed, 20 May 2026 07:08:51 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPb2u-00000003kp6-3dYK for linux-arm-kernel@lists.infradead.org; Wed, 20 May 2026 07:08:50 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 3DEC6439CA; Wed, 20 May 2026 07:08:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9F4391F000E9; Wed, 20 May 2026 07:08:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779260928; bh=5sJis8pObID1kGXbTsB3IgBpTH0zVnG6Ljg/eY2IOOw=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=A9Bu3nZDhvaFcfELXf4UkmdvoHWG8zM8SVVoHH7y6l+aB2QgVl8ziyb6OuCzbkNyF 5UIZamzIkBLHtjR6dG+v9RE+0sfdwvGqQ4ZABQFXrHKtZ7e9Wsz8Nyv0Gh/9suiH58 9Z/uuZdPald2ZugknTF69bFdLoqzoPSwGRbNU4+UAIfTrF4o5UKmmzV62LLo7gx71B uH+M69vBBd2wuT98G+aEoquU/Txyr825E2Lv9AJjia5z2fF3NQ60Gw01SIi7t6LVEe gUuc5o7RNTlNTvxtKtS5r3MCQIqXIJmyI420QmmU62ZW1N2dGmpg0HrL+PoAfPnN34 Dc40T4gV6/cbg== Message-ID: Date: Wed, 20 May 2026 09:08:42 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/5] dt-bindings: connector: Add fsl,io-connector binding To: "Chancel Liu (OSS)" , Chancel Liu Cc: "robh@kernel.org" , "krzk+dt@kernel.org" , "conor+dt@kernel.org" , Frank Li , "s.hauer@pengutronix.de" , "festevam@gmail.com" , "mturquette@baylibre.com" , "sboyd@kernel.org" , "kernel@pengutronix.de" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "imx@lists.linux.dev" , "linux-arm-kernel@lists.infradead.org" , "linux-clk@vger.kernel.org" References: <20260509024846.2094049-1-chancel.liu@nxp.com> <20260509024846.2094049-3-chancel.liu@nxp.com> <20260515-resourceful-singing-roadrunner-ce25ec@quoll> <20260519-macho-degu-from-nibiru-960af2@quoll> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260520_000848_946010_EAB6A14E X-CRM114-Status: GOOD ( 16.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 20/05/2026 07:02, Chancel Liu (OSS) wrote: >>>>>>> +description: >>>>>>> + The NXP I/O connector represents a physically present I/O >>>>>>> +connector on the >>>>>>> + base board. It acts as a nexus that exposes a constrained set >> of >>>>>>> +I/O >>>>>>> + resources, such as GPIOs, clocks, PWMs and interrupts, through >>>>>>> +fixed >>>>>>> + electrical wiring. All actual hardware providers reside on the >> base >>>> board. >>>>>>> + The connector node only defines index-based mappings to those >>>>>> providers. >>>>>>> + >>>>>>> +properties: >>>>>>> + compatible: >>>>>>> + const: fsl,io-connector >>>>>> >>>>>> Everything is IO. Everything is connector, so your compatible does >>>>>> not match requirements from writing bindings. >>>>>> >>>>> >>>>> Yes, this compatible is too generic. I will rename the compatible to >>>>> fsl,aud-io-connector. >>>> >>>> aud is not much better. Which boards have it? What's the pinout? >> What's >>>> standard? Is it described anywhere? If so, provide reference to >> spec/docs. >>>> >>> >>> This is not an industry standard electrical interface. This connector >> >> Then if you do not have standard, then you have board specific layouts >> thus you need board-specific compatibles. You can use fallbacks. Generic >> fallback could work, but both io-connector and aud-io-connector are just >> too generic. Every connector is "connector" and "io", thus absolutely >> anything can be "io-connector". "aud" improves it only a bit, thus >> honestly I would go with board specific fallback as well. >> > > How about board specific + common fallback compatible like this: > compatible: > items: > - enum: > - fsl,imx95-19x19-evk-aud-io-connector > - fsl,imx952-evk-aud-io-connector > - const: fsl,imx-aud-io-connector > Since the daughter board is named “IMX-AUD-IO” in publicly available I don't think it is named like that. git grep -i imx-aud-io > documentation, common compatible clearly indicates that this connector > is intended for that. > > Also, I want to talk about the topic of generic connector. It's a common > design that daughter board is connected to base board through a > connector. This connector more often acts as a nexus that exposes a > constrained subset of GPIO, clock, PWM and interrupt resources to the > daughter board. Can we document this kind of connector as a generic > binding? So this binding is the connector between carrier and some addon? Then you don't get a compatible for that at all, because it is not necessary, not useful and NEVER used. Do you see socket LGA "connector" bindings? No. Best regards, Krzysztof