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 1148113A244; Mon, 24 Mar 2025 07:21:17 +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=1742800878; cv=none; b=TbNHQi4s0xPg5cWBvbte8DkKobAzdaoTuzX2DW1TLTPfL+dnmDtIJ5+XAeyL61B+FXfXpuBQ9dTb3o9fWRTMffiEXJMLz/+it3IEkIszRAlV58VYsM3xRGaKR4M+BxvEmga0I9SeCHAf7no3D4O5QqnrXkoSJoBVI0wPjBI8hJE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742800878; c=relaxed/simple; bh=hZOLeXM0Ug3C3TwPfT34U466/uiJ/FqJQwwx+ag0N2o=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=cW0oT2cogozuFkaeYURQYrBOFlg82Xi7YQLHozWjO1mKTe7+V3rRib8it7JNkXaeA5kWgPRaA9a7GM8hRHmyM8Cxs0VCvJpClYf21mTHBqND++Kb8GBxTptsY27MbB6EI/X93RtV2XLMmU5hv+6G8GveaBjyrG8iVO7s9qBsPk8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=V0V0ccYw; 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="V0V0ccYw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6DBC8C4CEDD; Mon, 24 Mar 2025 07:21:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1742800877; bh=hZOLeXM0Ug3C3TwPfT34U466/uiJ/FqJQwwx+ag0N2o=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=V0V0ccYw3vDZ2ElMfWTcMXj8wMmna3rIjzOrMW6fNWlJR33R4JjLz0U/qebJT6bjm /stdXKZkCGLYpqPBsFaUGTaBUuo2RzfZvlOeoOLQ/d8NrIEKl0wZrPcorqX5ozv19c bazQG3zZnkL3n1LwJaIc7dKQYxHoq6WVY9QG0MH1exCiCLBnOfCwMJAJr8yhir90Vy tWH3jRHRE9WTpm7VAawb5JMOb3CGlmNVWBES5+zMxdMiPdasSt/aEFNZWnNdofWKBy stdik79Y1ltOAu15zDuRr6SKLw1ZkFA9Yoa2nIa8CU1xvYNdrdF/5k+E9sEHqYoyRW 5V2nzVRF7ajjw== Message-ID: <994cb954-f3c4-4a44-800e-9303787c1be9@kernel.org> Date: Mon, 24 Mar 2025 08:21:09 +0100 Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v16 1/3] dt-bindings: i2c: aspeed: support for AST2600-i2cv2 To: Ryan Chen Cc: "benh@kernel.crashing.org" , "joel@jms.id.au" , "andi.shyti@kernel.org" , "robh@kernel.org" , "krzk+dt@kernel.org" , "conor+dt@kernel.org" , "andrew@codeconstruct.com.au" , "p.zabel@pengutronix.de" , "andriy.shevchenko@linux.intel.com" , "linux-i2c@vger.kernel.org" , "openbmc@lists.ozlabs.org" , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-aspeed@lists.ozlabs.org" , "linux-kernel@vger.kernel.org" , Mo Elbadry References: <20250224055936.1804279-1-ryan_chen@aspeedtech.com> <20250224055936.1804279-2-ryan_chen@aspeedtech.com> <20250224-arrogant-adventurous-mackerel-0dc18a@krzk-bin> <50327725-f3b8-4a8b-94a2-85afccd2868a@kernel.org> <069b9fe4-c54a-4efd-923e-1558c59fe3f4@kernel.org> <677cb075-24ae-45d8-bfb4-9b23fbacc5df@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 19/03/2025 12:12, Ryan Chen wrote: >> Subject: Re: [PATCH v16 1/3] dt-bindings: i2c: aspeed: support for >> AST2600-i2cv2 >> >> On 17/03/2025 10:21, Ryan Chen wrote: >>>> Neither this. >>>> >>>> So it seems you describe already existing and documented I2C, but for >>>> some reason you want second compatible. The problem is that you do >>>> not provide reason from the point of view of bindings. >>>> >>>> To summarize: what your users want - don't care. Start properly >>>> describing hardware and your SoC. >>> >>> OK, for ast2600 i2c controller have two register mode setting. >>> One, I call it is old register setting, that is right now i2c-aspeed.c >>> .compatible = "aspeed,ast2600-i2c-bus", And there have a global register >> that can set i2c controller as new mode register set. >>> That I am going to drive. That I post is all register in new an old register list. >>> >>> For example, >>> Global register [2] = 0 => i2c present as old register set Global >>> register [2] = 1 => i2c present as new register set >> It's the same device though, so the same compatible. > > Sorry, it is different design, and it share the same register space. > So that the reason add new compatible "aspeed,ast2600-i2cv2" for this driver. > It is different register layout. Which device is described by the existing "aspeed,ast2600-i2c-bus" compatible? And which device is described by new compatible? Best regards, Krzysztof