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 66633384238; Tue, 21 Apr 2026 10:05:49 +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=1776765949; cv=none; b=idNBhRzuqt5X6PzXDq0FXGVuyPIZCfAEHNjcDRwyDix3X6aTJJBNWVzESsmLOpc4udvWueReDPP8nv4mHJwrQaSdotbapcfA8o9QMJ+sWwr1iXUpCNQOVHr71rPIhWym4lhFwV8CIo7HtwiRKXaKazhAeUh++hy58hIqFwjuxnM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776765949; c=relaxed/simple; bh=+cfPG4Mw62gTIoG3jwVbg119dKxTwWwwWXPMp7K0Spg=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=f9Res4EiGklPSJ/SHGKHMqze9OCSeCeQka9JbmQ0Twdi5Kiel8dKP7e8qFRW9WuMuboMH9OWh7dPAgJThHkjpacXS9Qc2IlUE/PXuBNfMhQr2iOnSriwttOTpENw4oLeV+0IFsvaPYO11BZwccGChlwqj7aZG58kzlKkZv1OSaU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=loyd4NgB; 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="loyd4NgB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D17B7C2BCB0; Tue, 21 Apr 2026 10:05:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776765949; bh=+cfPG4Mw62gTIoG3jwVbg119dKxTwWwwWXPMp7K0Spg=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=loyd4NgBIvL5LpxBfsRYWIvtrBK/R9mCbiYhNrkdrZPI/KFIWmLrKxc9WAMMto6Qh 1rufGjMBvbBswFVQO7kSap7GzAXYhm+y72Vlo8e3FtzZOJMWX6F9u3uBbLgaLWZEN1 QBw0BEVM4PgqLLYyxjiCcL6+Qr0teePSKJiVDTXgwWXtFCYkL9+QLO1u26VjvkHbNc CJaMaXkT/T3v0obgmY3m3mlEzoiQWsgvUS8yMu1xYAU8BuSzP3KbFtxlwKOvR+mzhw 7XhiGJ5jP285/qflOB1WPJCP7PsTKd9llua50dLfQOjWkOzpWsO2J/HNgR9cKMqzoC TrYfak+FMysEw== Message-ID: <9c9795b0-a8ba-453d-9a92-f07b3ca59070@kernel.org> Date: Tue, 21 Apr 2026 12:05:45 +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 v1 1/2] dt-bindings: trivial-devices: add toradex,lava-hat-spi To: Francesco Dolcini Cc: Conor Dooley , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Mark Brown , Francesco Dolcini , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org References: <20260420114537.78160-1-francesco@dolcini.it> <20260420114537.78160-2-francesco@dolcini.it> <20260420-task-navy-370ea247fe1d@spud> <005d96ea-b250-4af8-9c5b-d145bae892e5@kernel.org> <20260421083843.GA23508@francesco-nb> <20260421095928.GB23508@francesco-nb> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 21/04/2026 11:59, Francesco Dolcini wrote: > >> Toradex LAVA hat is way too generic. No, single compatible string is not >> sufficient, please read writing bindings. >> >> Please define exact model and variants. >> >>> >>> The need is to be able to test SPI with a mainline Linux kernel, so I am >>> looking for a solution that works in mainline Linux. >> >> incomplete devices do not stop you from that. > > Do this sentence means that I can send a DT file for inclusion in the > Linux kernel using a compatible documented in incomplete-devices? No. You will be testing a mainline DTS + load non-mainline overlay. So your requirements of "mainline Linux" are fully solved. Overlay is loaded by bootloader for example and thus your kernel is fully mainline. > >> But you don't get exceptions because you want to mainline your DTS. Your >> need detailed hardware description and precise compatible per each exact >> hat ("exists in multiple variants"). > > Let me get into more details here, before sending a new patch version. > > We have various LAVA HAT devices, the difference is that they provide > different features and a different layout, based on the actual carrier > board they are mated with. > > We have an "Aquila LAVA HAT", that can be mated with the "Aquila > Development Board", and a "Verdin LAVA HAT", that can be mated with a > "Verdin Dahlia Board". Of course, because each device is specific so even the hat must be specific, unless you have a standard connector like Arduino or RPi. > > As an example, you can find the Verdin Dahlia DTS here, > ti/k3-am625-verdin-wifi-dahlia.dts, that can be mated with the "Verdin > LAVA HAT". > > The SPI device on both "Aquila LAVA HAT" and "Verdin LAVA HAT", is the > same, no differences. On the Aquila variant we > have two instances of it, while on the Verdin we have only one instance > of it. > > So, would we need a compatible like this? > > compatible = "toradex,aquila-lava-hat-spi", "toradex,lava-hat-spi"; > > or > > compatible = "toradex,verdin-lava-hat-spi", "toradex,lava-hat-spi"; Yes, assuming that verdin/aquila hat works for EVERY verdin/aquila board, regardless what SoM or SoC you have there. Verdin is a SoM family according to: https://www.toradex.com/computer-on-modules/verdin-arm-family and I doubt you can attach hat to a SoM. There is no connector on SoM for the hat... so probably you have a board, like Dahlia. Best regards, Krzysztof