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 5045C288C34; Wed, 13 Aug 2025 16:19:38 +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=1755101980; cv=none; b=rI97LJ8FVIVBZSZuL/oTBHgfi7Uoh4PJgR0FDJcnZ+OXHvlte7wZZ0rmSK7koYesvmqXQYf1kedvIIGyASkY0KlbzYv2nOs2hj0BlGXq3g8UIvlZJMs9RdnoNYTBD4MMt9SJBeo3TcsuFhP2mB/pMJGjVcG8U5G3ivnKRceNPug= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755101980; c=relaxed/simple; bh=zktYY27yEtPifC5oo8BefdXqq2I5u3RdgBI9sbeT2qI=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ut8BC6OE+argAHrX2LEvcPCyDe4qkd/FhVJ0XHR2Vmgv3TPfgvVdf4N1D40CIxOZuFrTlj5pdSLiVNNq77nz2Grpg0sKk/tRyCz4LTwpkHO5iko50TS8PiY36eao89XW00qeP4BJToa0GpzD7ZxSULZ5zdySLSgvmLUUY/75oDM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Y0S2YRBz; 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="Y0S2YRBz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3822BC4CEEB; Wed, 13 Aug 2025 16:19:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755101978; bh=zktYY27yEtPifC5oo8BefdXqq2I5u3RdgBI9sbeT2qI=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=Y0S2YRBzfti9YauFJtc0246BQaU8Vz4CII8FiOkOv1smqtWTMZvDlNtwRLlpz6Z2i lMSMvi5S/qe+VDAdrCLvRj81AE7F4qPPQ9DP5DmSKUWv4yPlmvnsWgt76mVofMB/FN 86tSaObspWlM0FZ2jFZegEzS+8e0uPn151PUrl24VNgYDCqKFzYOZ+rco7qP8j/1y7 d1qUhzP74UlJfN8lrP3o465itcMvtYOMAdjhkrDApbtaUAPXhIzR7z4+aqhM3g9b8x Pw0vwX6LObtKhrGCN1ieH7uB16pru91AcfI5uCRkcJ1E7OQHmfi21dWdjaWgAN/BHz 4y7tyUcz7JeDg== Message-ID: <017a4d15-286d-4e0a-89ff-f658009a6de6@kernel.org> Date: Wed, 13 Aug 2025 18:19:34 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/3] spi: dt-bindings: add doc for Amlogic A113L2 SFC To: Xianwei Zhao Cc: Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Liang Yang , Feng Chen , linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org References: <20250808-spifc-v1-0-ff4e30e26a6b@amlogic.com> <20250808-spifc-v1-1-ff4e30e26a6b@amlogic.com> <20250808-adamant-fat-raven-38c8b3@kuoka> <7fab19de-8ed1-4fe5-b2a4-a7e9c13d8424@amlogic.com> <5cc336bc-f071-41d2-b59a-af0df23af00b@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 13/08/2025 11:34, Xianwei Zhao wrote: > Hi Krzysztof, > Thanks for your reply. > > On 2025/8/13 15:36, Krzysztof Kozlowski wrote: >> [ EXTERNAL EMAIL ] >> >> On 13/08/2025 08:13, Xianwei Zhao wrote: >>>>> +allOf: >>>>> + - $ref: /schemas/spi/spi-controller.yaml# >>>>> + >>>>> +properties: >>>>> + compatible: >>>>> + const: amlogic,a4-spifc >>>>> + >>>>> + reg: >>>>> + items: >>>>> + - description: core registers >>>>> + - description: parent clk control registers >>>> >>>> Why are you poking to parent node or to clock registers? This looks like >>>> mixing up device address spaces. >>>> >>> >>> The SPIFC bus clock multiplexes EMMC modules, so the corresponding >>> frequency division register is also in EMMC module. The SPIFC and the >>> EMMC modules cannot be used simultaneously. >> >> Then obviously you cannot put here EMMC or parent registers. >> >> It looks really like you miss proper hardware representation. >> > > It does seem a bit unusual. However, in our hardware design, EMMC and > SFC modules are integrated, and they share common resources such as the > clock and I/O pins .They are mutually exclusive. > How did you express it in DT? This looks similar to serial engines and such are not implemented independently. > Here, I'll modify the register description. Do you think it's feasible No, because it changes nothing... Clock provider pokes clock divider registers. Not clock consumer. Best regards, Krzysztof