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 CBBA429A9FA; Wed, 8 Oct 2025 23:48:07 +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=1759967287; cv=none; b=CxuM15oUlw4PNpS0rLHuAxcAhmimXrQWyHPb89sEKzFvXHIGhiqxXsOKa1EOvAPNMjMQHUgLsx3usMITnbgubouO40TJbGWE3k62a9h8a0yy1J9OguVOfu4R0WkrQkEPSrOhBEAQswn4f6zynjOFhCrotzofZ2qgnMw3yJvGo1U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759967287; c=relaxed/simple; bh=ei5fTrRQetlx4PbWi0e374AeatGfy5m9T4ayTj3Ayow=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=FQW8UiL10/KozP4wWu5X5+EswbzuzZaLt4nq6UvPoqGdqKh5w10glo05Sda5SEttRkxn4tFYI3YWCvKhbmWjFlFqwrxVL4x0BtNKEXoaI7LNQD1k12fKrdw4Y69d/1oF0qJyCg5H2TZmktpFInvg7z/IldqTwvD7ZhE90AOMbxU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=rgxDYrO2; 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="rgxDYrO2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 15E0EC4CEE7; Wed, 8 Oct 2025 23:48:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1759967287; bh=ei5fTrRQetlx4PbWi0e374AeatGfy5m9T4ayTj3Ayow=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=rgxDYrO2wLreOOHgYrcqXhg4Mqr7P6Vym3ESKSpTzNFDEn/jxjdlVJP4K2nAE8inH YR8sJTMzhA9TnoxWaJmS5y8YR2v+yC4ESCrmP6lmV50CAtRNaxK1MyYNfBWsyMCuB3 Dnac9OqFvoT876mjR/yD+YgIvWP6dPFc2LowJadWH9ykCiJw5zeC1v+IBJomKRnlMu N42lPJppGfrfO1zP4ZCe99SFN21qirASB9+jLfybzpxi3uuxeXwXACADlZ3/JKjZqQ +eGu1jq4HUl7RdKpJQHK3SnCIad0v8ty80DDzEQpzg355RxnEQgDkxIkiwbif7KsS1 32cMHH/ow0pCg== Message-ID: Date: Thu, 9 Oct 2025 08:48:00 +0900 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: dmaengine: Add support for ATCDMAC300 DMA engine To: CL Wang , gg@swlinux02 Cc: Conor Dooley , vkoul@kernel.org, dmaengine@vger.kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, tim609@andestech.com References: <20251002131659.973955-1-cl634@andestech.com> <20251002131659.973955-2-cl634@andestech.com> <20251002-absolute-spinning-f899e75b2c4a@spud> <734de17e-a712-4eb5-96fa-b7e75f86d880@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 08/10/2025 22:35, CL Wang wrote: > Hi Krzysztof, > > Thanks for the clarification, and sorry for the earlier confusion. > > To elaborate on the rationale: > "andestech,atcdmac300" is the IP core name of the DMA controller, which serves > as a generic fallback compatible shared across multiple Andes SoCs. > > Primary compatible (SoC-specific): > andestech,qilai-dma refers to the DMA controller instance implemented on the > Qilai SoC, following the SoC-specific recommendation. > > Fallback compatible (IP-core specific): > andestech,atcdmac300 represents the reusable IP block used across different > Andes SoCs that share the same register map and programming model. > > Keeping andestech,atcdmac300 as a fallback helps avoid code duplication and > allows a single driver to support future SoCs using the same hardware IP. No, it helps in nothing. > > This approach follows the DeviceTree binding guideline: > > “DO use a SoC-specific compatible for all SoC devices, followed by a fallback > if appropriate. SoC-specific compatibles are also preferred for the fallbacks.” No, it does not. You just ignored completely last sentence. Best regards, Krzysztof