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 6DF9D1D61AA; Sun, 17 Aug 2025 07:20:59 +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=1755415259; cv=none; b=akfm29dSp3HT6F8nufIK6Rha49EYgl1gPrNh4zswbWtgXaqvq6M/mFfs55SDnJudj+oKTVaOCq4kf5khvGaFdMv3uR6TI+q1sJrWA4xLDJWTgbLOVFvgwdPG6ZQlNBi3m96UIWHQpVWvU+IXbwgg5a5+pWGy7z4sAVvftHV2b8M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755415259; c=relaxed/simple; bh=JQ9I2ZA6NpxuMGRw8pMBYPM7Uq05lyYD7RorcnDzmE4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=B/LI7/ji+WedAkDIx2NSeWyATlQD1uhHJOZH4HvdFhniRC7Ew50TCzwVHGdOfZ4uIexfxrMEOkJFLOdhtTvcAYT+K69YuTz3glFYdiTjqS8jqGQKcH8LJUkFShmw2WvE1Mrh9xe9fppgkp0ixpm3iNXhzprKZTJMVw0BC9xgAHs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lSI8vqTN; 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="lSI8vqTN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5A674C4CEEB; Sun, 17 Aug 2025 07:20:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755415258; bh=JQ9I2ZA6NpxuMGRw8pMBYPM7Uq05lyYD7RorcnDzmE4=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=lSI8vqTNzeBPDxdLTp2i2cQaiaCWOq9avtgUBF0WanE+AzYS2kW+QiH+9XEVOKbzK K1YxBet3nf1oZjkwZoL7StOOhAIu8cAuu08zGQAM/E7lN/SdhUJYQ6XPQmUHa95Rl+ sW+VLqEH2Pcbqp05UuFgokqjlcUXCwkYZbbqKpBnr1fo2p/XI5J0da5FgEqPcvIUKa 5BLd4OYX/ZIyNCNe1HtY/EKvNBenMCVE4Go1iSDMOJ2+pwqZKIqyHi7k9yI96RUg2M EwPgBZ9mY/XFDV8qQON3sBWLfV/XhMREB5uxpAicYALqVxuuOZQG3nrVimz+H3Yb25 3C0eJ7Rezd3AA== Message-ID: Date: Sun, 17 Aug 2025 09:20:54 +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> <017a4d15-286d-4e0a-89ff-f658009a6de6@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 14/08/2025 08:38, Xianwei Zhao wrote: > Hi Krzysztof, > Thanks for your reply. > > On 2025/8/14 00:19, Krzysztof Kozlowski wrote: >> [ EXTERNAL EMAIL ] >> >> 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. >> > > The hardware design provides this clock for both modules — EMMC and > SPIFC. A control bit (bit 31: Cfg_NAND, where 0 = Port C only, 1 = NAND) > is used to determine which module uses the clock. > > It's not that NAND is using EMMC’s resources; rather, the configuration > register controlling this selection is located within the EMMC module, > which makes the setup appear somewhat unusual. No, how did you express in DT that they are mutually exclusive? > > In the device tree (DT), I'll just refer directly to the clock frequency > division control register. This does not solve the exclusive usage... Best regards, Krzysztof