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 DABF554739; Tue, 6 May 2025 18:12:32 +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=1746555154; cv=none; b=Z2wxFB4QU7GuRPskdUOXKR+kgZ6J7w19aRIVt5h1buTcEIziIMEdbx5ut6pNEsb9ODmOKU7v1cpaitVPOw1Tw0Vf5z6myZBcNnnF+luvRkCIPr4r1jijzrFvNADIGtGSBe0A1LvJZtR3F3UTk5MUIKs7kL+9SAX5i8scqJpxv78= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746555154; c=relaxed/simple; bh=hdqJCIoHpWG2oC0+5/RZxc665pSoigGd4qD/q+klCts=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; b=uNch4ZKBRnJuRP39r6u70NM1ksUIejxb/GndkL91nnJxdS0VrEV9e7Bj3NuAYbqzACZxYahDR932x4/wBcaVZNoUHueo6C6PUXD+qYwXYyX4bJh3PkcPzIg945rRvOw8/Xwq8mM5wGvxjaJENvjfP54j3V930kKVSZBq6JsfEF4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=iKt91tey; 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="iKt91tey" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EF68FC4CEE4; Tue, 6 May 2025 18:12:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746555152; bh=hdqJCIoHpWG2oC0+5/RZxc665pSoigGd4qD/q+klCts=; h=Date:Subject:To:References:From:In-Reply-To:From; b=iKt91tey8+RVqP1Wsy2wS+grHhXjuz0kVzrzCblps7/GnEp5a5J8AA3vQZD+Rvycv h6acvQgb5V5wYIkEONt3AZVOV2qM2vMYL34mf/k06ro1IZHMyeRfkeNY6XIBaNtMzI e82l/HeBdU69OlyPg7+ZtgA+sC8GGEb30x3aXWAiNSfALt1KqlgxM3g4IaHlEK2jMC hhcberw9My4Vk462+nob31Ev9QgUQ73SwepXf4tF8dV5uutqRHwHTpQCHeQuVeFf24 IfdfCEmUifxGleICfpix/doAgQXaTQFedAvkQGWjQyadbTwnvwleVkqmrYJcHJB8NL lVyiYOw2a+v5Q== Message-ID: Date: Tue, 6 May 2025 20:12:27 +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 v2] dt-bindings: spi: nvidia,tegra210-quad: Add IOMMU property for Tegra234 To: Vishwaroop A , broonie@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, thierry.reding@gmail.com, jonathanh@nvidia.com, skomatineni@nvidia.com, ldewangan@nvidia.com, kyarlagadda@nvidia.com, smangipudi@nvidia.com, linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250506175813.3429319-1-va@nvidia.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 06/05/2025 19:58, Vishwaroop A wrote: > The Tegra210 Quad SPI controller uses internal DMA engines to efficiently transfer data between system memory and the SPI bus. On Tegra234 platform, DMA transactions must be properly mapped and protected through IOMMU to ensure system security and functional correctness. Tegra241 uses external DMA and doesn't require IOMMU. Please wrap commit message according to Linux coding style / submission process (neither too early nor over the limit): https://elixir.bootlin.com/linux/v6.4-rc1/source/Documentation/process/submitting-patches.rst#L597 I don't think you read the review, just skimmed. I explained there how to construct subject prefix and gave a link explaining it better. Can you reach to your colleagues to help in upstreaming process to avoid easy mistakes? Many companies have internal checklists or internal guides helping in that... > > Add the iommus property to the device tree binding, making it required only for Tegra234 platform while explicitly disallowing it for other platforms including Tegra241. Why requiring it for Tegra234? Do not explain what you did - we see it easily. Explain what we do not see, so why you are breaking ABI. Best regards, Krzysztof