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 1A6102147F8; Wed, 9 Apr 2025 07:33:43 +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=1744184024; cv=none; b=UbJi6XKakzH7LpFtFuj+C7JcATB9jHg4xv9E2w6z2naSZWWACjGY8N7wBlgujwj7EnB/vxm4nc5M2SeJPtQUyPLmCQCfmbeUgrFupjLz6ym1sDoFAU0P1H9GXDRSVwcuCH9XTB0vgb1CDH/c5ibq4FyDCp4WoFkHz0CAxBKQ1bU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744184024; c=relaxed/simple; bh=TbjocJ7oJ1wE3teiuUGsEIirnON9GZPBxazhTpNsjqw=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=k+EBDbYMluDnYZpiOdDmTGOfDoQHgmH8MEtatqRQPB6ZXhHYgVKejRuvoldNsJW/KIiUO5AzMsZ78lMhPCcwG8OGDiBrKCT+TMQlNywYzXp6bbUDbI3XTZiAJxFzCHMXTk/wFnt5gfbSpxykYq8Ay1WluFuMkCCn4ostdYv3XD8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oW73w/Ts; 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="oW73w/Ts" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2DC08C4CEE3; Wed, 9 Apr 2025 07:33:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1744184023; bh=TbjocJ7oJ1wE3teiuUGsEIirnON9GZPBxazhTpNsjqw=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=oW73w/TsFr0FI4Nb5NBVXBMLKDRdct1Vd9vmmIUIlj9K2WHxNSt7WHJSQ329866Qo NifXrmT9lNFgsxuTKdNI9dk1AbnOTu1Y1mSkysC/T0r094cl3hTH78GZr0m8Fc3EB7 ++07A2yv5AYaXYag9RR5C+eUZgZkvn/HKMoTkk1vf3KbmoYhTr9Xvg94plqka26gM7 zB3Aw6CUSUR02TTgqGU4YAm2N3+ZU/M3aHdXSUHXW/Y4IjOh47KUBL4SRgeaV3b/iu g06d6+I5XtAnQxRu+WBi74SydfBtiERzaAy2OP7O9Q3AcIw2EiZlRnhDLYmVp6FkOm kecHwhnyKc8Qg== Message-ID: Date: Wed, 9 Apr 2025 09:33:39 +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 v4 1/2] dt-bindings: memory-controllers: Add MediaTek DRAM controller interface To: =?UTF-8?B?Q3J5c3RhbCBHdW8gKOmDreaZtik=?= Cc: "linux-kernel@vger.kernel.org" , "linux-mediatek@lists.infradead.org" , "devicetree@vger.kernel.org" , "conor+dt@kernel.org" , Project_Global_Chrome_Upstream_Group , "robh@kernel.org" , "linux-arm-kernel@lists.infradead.org" , "matthias.bgg@gmail.com" , AngeloGioacchino Del Regno References: <20250403065030.22761-1-crystal.guo@mediatek.com> <20250403065030.22761-2-crystal.guo@mediatek.com> <20250406-hasty-saffron-flamingo-5c1dae@shite> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 09/04/2025 09:16, Crystal Guo (郭晶) wrote: > On Sun, 2025-04-06 at 14:35 +0200, Krzysztof Kozlowski wrote: >> External email : Please do not click links or open attachments until >> you have verified the sender or the content. >> >> >> On Thu, Apr 03, 2025 at 02:48:47PM GMT, Crystal Guo wrote: >>> +maintainers: >>> + - Crystal Guo >>> + >>> +description: >>> + A MediaTek DRAM controller interface to provide the current data >>> rate of DRAM. >> >> DRAM controller does not offer scaling? Or PHY/timing configuration? >> This binding looks pretty incomplete. >> > > The PHY/timing configuration is completed during the bootloader stage. > In the kernel, we currently only need to provide an interface to > retrieve the current DDR data rate. Not really, that's what you currently want to do in kernel, but not what you for example will want next days. Binding is supposed to be complete, so if you do not have any scaling/interconnect then extend the description of hardware and explain that memory controller is non configurable, cannot scale and it exposes only read interface. Or something similar. Best regards, Krzysztof