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 6D18923EA8A; Mon, 16 Mar 2026 08:36:46 +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=1773650206; cv=none; b=j8g2SVBNH2PnzfnKUxLcoFEzgntUoA7nMJ1fKdicWHkaGfjB2Ca8dQvHiFZKwlCWQIEsD+TgZQlAKukdnHvT0hlo4X9Ma87ikJePAnEVMTnMwCr8JJ84xWReOl8pju0BKYCV1RYDtFWZZC6Pi7hlWq+pbMG0mFwsXc3mlO6AodY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773650206; c=relaxed/simple; bh=j5XqXvo+8WUpL16FpwNBiVLr3/TQXp1vN1Ye/sajw3A=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=ohFhKJ/bqwzkzJGuhedi73hadmZLb3HbA0SOrbQc6kK31SN9qQybdJ78geTW0nVvf1ZAg544G8YZIQ/iAlK7jIsh5hxht6iZMOY5F/rCtv8FPE4ms7zk9lC1k2BPqUgreXO6YckWPKD/nMCBaMLt0TUEw3zhLj0FeQzLOCOFSto= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Mvqu9nka; 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="Mvqu9nka" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 48567C19421; Mon, 16 Mar 2026 08:36:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773650206; bh=j5XqXvo+8WUpL16FpwNBiVLr3/TQXp1vN1Ye/sajw3A=; h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=Mvqu9nkacTl7zejRGMu7LhdYgEzQ5ryFtnj1tNktDMdj2YMHBS++PwgN5HR9DoS2Y f8wa0H08sEmZWGQXvsapw9Lpq1wzFQw/XcjVKVbjom+nVrQPlWwL222d4mWMN7twt+ odsmaMgcZSNShICI2WdKoVkvWBOEQkY4sD93V3qynQsqziG1dbKvyLYtR13VJQg90k Hair4ySqPWkH4GUVAT2+HBcBPzebmVSXWsKDsLbn8GdYPPIYYkU01mvAX1S61tjRPF /VLLk08v3LKHSdyfMhOhSnc7TnuIzo6MbvgwhYkujNHNR7Ehc07nlRkNj41vG3iQNO dnodMBQyt51jw== Message-ID: Date: Mon, 16 Mar 2026 09:36:42 +0100 Precedence: bulk X-Mailing-List: linux-spi@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 spi-miso-mosi-loopback From: Krzysztof Kozlowski To: Francesco Dolcini , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Mark Brown Cc: Francesco Dolcini , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org References: <20260316073547.11437-1-francesco@dolcini.it> <20260316073547.11437-2-francesco@dolcini.it> Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 16/03/2026 09:35, Krzysztof Kozlowski wrote: > On 16/03/2026 08:35, Francesco Dolcini wrote: >> From: Francesco Dolcini >> >> Add a compatible to describe a single wire loopback between SPI MISO and >> MOSI signals. >> >> Link: https://lore.kernel.org/all/20260310133254.GA51497@francesco-nb/ >> Signed-off-by: Francesco Dolcini >> --- >> Documentation/devicetree/bindings/trivial-devices.yaml | 2 ++ >> 1 file changed, 2 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml >> index a482aeadcd44..2cb973c157f6 100644 >> --- a/Documentation/devicetree/bindings/trivial-devices.yaml >> +++ b/Documentation/devicetree/bindings/trivial-devices.yaml >> @@ -432,6 +432,8 @@ properties: >> - socionext,uniphier-smpctrl >> # SparkFun Qwiic Joystick (COM-15168) with i2c interface >> - sparkfun,qwiic-joystick >> + # Single wire loopback between SPI MISO and MOSI signals >> + - spi-miso-mosi-loopback > > If you decided to go against my approach, then at least document it in > proper place - incomplete-devices - so this won't be ever used in DTS. > ... and then you will notice existing linux,spi-loopback-test, so explain the differences and why spi-loopback-test cannot be used for your loopback test. Best regards, Krzysztof