From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 1767541A571; Tue, 22 Sep 2026 08:50:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790067026; cv=none; b=EE5YDiodh9LVv9WiXbgCLj2qPXIKZW/zS8e75014iFty0g7pNvNW5PWYyxN5cK9sa2f0uBN7q3+QW7qoc02HrmjBVcpjbKqxL/Q0mJaAHcmZsXvmraZ0SgGrj4J2oN4r6y8oDjJZlrwgLGUOntsynBfAVL9gnBLKKouv0wXGqM4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790067026; c=relaxed/simple; bh=usJ9k0xIu/92xmYleGav7bAWB7qWarZ6/FOF9OnKu/A=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=gD/xN45nCUhZhv+CykhzcvATS3s+CNvAGYqjVz/llSAzPB2ieaH8kFIL2oIuWAk0lHLsnR7vtN/mBKn+otlsXCL+eEp9Op2a4LX3FYljsbjv28QsKvhJdoD4oE6LRO3r3tTGfMiZnlkONdZD45yybMUPHJa6RyDOQ2yVjJ50wEk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=opWS6UUI; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="opWS6UUI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E97631F000FF; Tue, 22 Sep 2026 08:50:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790067024; bh=MgnVfIs/WpyD4SY8L5DNXFoVYC8LNakfhMUHMvbFWI8=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=opWS6UUIeQBlbzi/lqwi28O+DUOes/PReZleyU9SEku2+DCGzbailNMW7b/ZtCdUv zOFvzBm1gjsHA5b0VHt7Pz0vmhsdWq04AGM0HtjGk7jUYkyz2/t2lz+9dMYddBo0/X Q/ODrq8zKKFCMOiWe6v40rMs3Yc+7q7me6TXdV6KKMcia5ljn8jBFx/hD3vFebYWbP esnI8HkZCnKOyEmkEjXDyq+om5pMh0kAWHuCjKl9j+BH8R1ylPLTZWTcbNqGbxday+ kFzchDl/qpngYtFoyBC6wRozWKfkahqBvyI4f2sUuDr22/RyJfR7KzgUfrAHGQ5jOP EpURof2SIMj6A== Message-ID: Date: Tue, 22 Sep 2026 10:50:17 +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] dt-bindings: i2c: dw: Add DWC_i2c compatible To: Aniket Limaye , Mika Westerberg Cc: Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Nirujogi Pratap , Bin Du , Andy Shevchenko , linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, vigneshr@ti.com, nm@ti.com, u-kumar1@ti.com, lianfeng.ouyang@starfivetech.com, Ritwick.Sharma@arm.com References: <20260919-tda54-upstream-i2c-v1-0-b0b9f77be18b@ti.com> <20260919-tda54-upstream-i2c-v1-1-b0b9f77be18b@ti.com> <20260920-warm-lurking-poodle-dd73ee@quoll> <20260921111407.GU106095@black.igk.intel.com> <6fa3b1a7-33bb-4619-a0a5-42d99c076d2f@kernel.org> <20260921141031.GX106095@black.igk.intel.com> <203f72c8-4a06-41d4-9212-9625f6be0281@ti.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; keydata= xsFNBFVDQq4BEAC6KeLOfFsAvFMBsrCrJ2bCalhPv5+KQF2PS2+iwZI8BpRZoV+Bd5kWvN79 cFgcqTTuNHjAvxtUG8pQgGTHAObYs6xeYJtjUH0ZX6ndJ33FJYf5V3yXqqjcZ30FgHzJCFUu JMp7PSyMPzpUXfU12yfcRYVEMQrmplNZssmYhiTeVicuOOypWugZKVLGNm0IweVCaZ/DJDIH gNbpvVwjcKYrx85m9cBVEBUGaQP6AT7qlVCkrf50v8bofSIyVa2xmubbAwwFA1oxoOusjPIE J3iadrwpFvsZjF5uHAKS+7wHLoW9hVzOnLbX6ajk5Hf8Pb1m+VH/E8bPBNNYKkfTtypTDUCj NYcd27tjnXfG+SDs/EXNUAIRefCyvaRG7oRYF3Ec+2RgQDRnmmjCjoQNbFrJvJkFHlPeHaeS BosGY+XWKydnmsfY7SSnjAzLUGAFhLd/XDVpb1Een2XucPpKvt9ORF+48gy12FA5GduRLhQU vK4tU7ojoem/G23PcowM1CwPurC8sAVsQb9KmwTGh7rVz3ks3w/zfGBy3+WmLg++C2Wct6nM Pd8/6CBVjEWqD06/RjI2AnjIq5fSEH/BIfXXfC68nMp9BZoy3So4ZsbOlBmtAPvMYX6U8VwD TNeBxJu5Ex0Izf1NV9CzC3nNaFUYOY8KfN01X5SExAoVTr09ewARAQABzSVLcnp5c3p0b2Yg S296bG93c2tpIDxrcnprQGtlcm5lbC5vcmc+wsGPBBMBCgA5AhsDBgsJCAcDAgYVCAIJCgsE FgIDAQIeAQIXgBYhBJvQfg4MUfjVlne3VBuTQ307QWKbBQJp2mE8AAoJEBuTQ307QWKbeaIP /ihHTkTW4KsN/DQ945JJbyu5tI0J80Wue7QyyLPglyKfhgb5cLLNPpOC8cCIJsc7+W3i2P38 s2c1cOH6CYGE7E9ur3Vfme8NW2S2I/Z8VC7bZnzyS23wT17LrsdS/qCpx4o8U+pt/xdXDKph EGRYrIEmMpUWvyYzyYKGIe25FtaayIIKpq8eZYyFcp2f/sG5IkOW5uZzHPMPdcm87jU7fyuQ rAU2vx9r+ulUfQ/q9Z2roC/ode3l7t2pN7BCBCsUDp6JCrUyZrtT1e7EbA0ZRP3aOBNk2P2E DQOgJGjGdO5Yx2Y9LFtltu6JbsBJHi1syGRX3AtQYOMc4Y1WGoeZJmMlvKj2ZqqXNkcWi2DS IQEWB0uW6CqFsBBIMGDa+6OzdaVO/uAVXWDWml02Men3CILdI1MbVjoh8ECqYUY7OQ+JJvNN vnliuq5WM3Ghd3jg/LZZrxXjdIginRHFQCjIJYLKpLZWm1/iDFedcfzqRNYmTtqscdCNHW41 oT3Z7BmO9xwdjuwBS6nmS6JJwkbf5Ot2QR4pB/DRU7ZwjT1qHe+9r9gF32wXVQatHNGK/VVu sfwOnkdxCWkp/qb2gdQRmZh+SedStWshigH6sNfuHBloF/q+hjMRc8b2m326OZdrbSHwY1Sz vti8Hn7n8NjdHO9LKB7BIdjkA9DA5WsqOuVCzsFNBFVDXDQBEADNkrQYSREUL4D3Gws46JEo Z9HEQOKtkrwjrzlw/tCmqVzERRPvz2Xg8n7+HRCrgqnodIYoUh5WsU84N03KlLueMNsWLJBv BaubYN4JuJIdRr4dS4oyF1/fQAQPHh8Thpiz0SAZFx6iWKB7Qrz3OrGCjTPcW6eiOMheesVS 5hxietSmlin+SilmIAPZHx7n242u6kdHOh+/SyLImKn/dh9RzatVpUKbv34eP1wAGldWsRxb f3WP9pFNObSzI/Bo3kA89Xx2rO2roC+Gq4LeHvo7ptzcLcrqaHUAcZ3CgFG88CnA6z6lBZn0 WyewEcPOPdcUB2Q7D/NiUY+HDiV99rAYPJztjeTrBSTnHeSBPb+qn5ZZGQwIdUW9YegxWKvX XHTwB5eMzo/RB6vffwqcnHDoe0q7VgzRRZJwpi6aMIXLfeWZ5Wrwaw2zldFuO4Dt91pFzBSO IpeMtfgb/Pfe/a1WJ/GgaIRIBE+NUqckM+3zJHGmVPqJP/h2Iwv6nw8U+7Yyl6gUBLHFTg2h YnLFJI4Xjg+AX1hHFVKmvl3VBHIsBv0oDcsQWXqY+NaFahT0lRPjYtrTa1v3tem/JoFzZ4B0 p27K+qQCF2R96hVvuEyjzBmdq2esyE6zIqftdo4MOJho8uctOiWbwNNq2U9pPWmu4vXVFBYI GmpyNPYzRm0QPwARAQABwsF2BBgBCgAgAhsMFiEEm9B+DgxR+NWWd7dUG5NDfTtBYpsFAmna YUkACgkQG5NDfTtBYptX+BAApg32CkxwNucNEi8WfWA8oKkW0y8YDuY6ORMo9FWNGiT/OTy0 vyJrLocrpn86zwfjVp+eCrssPYh8eqJfnWqmYv6ACQtHPYzPZQ3mSo8H97Z01oUxITzCxpXm ZkLgPIqtDPcC2E3dPM/fVxcyowM8XsaMA9wcsaUYrta8toOq2b9tKcjleKMfMrm0gQ9u7wUc QbLkwj6TCLOwucb07GXzLTNF9PZmaDUpKAZjMjmrW+le+SFvQbhamx0rxLWPR0NWntXpbCn+ +ACch03p/JyTBVktxFsFyCt7pTPE1kEaeuXBTe/a2D9iQvRxRW19LvuO2e59/u1wYUiH/orz wbIC2S4dBsPAPihL3ztOU1yE86GPyQtSE0kU+/7snnLt4QGi6PChf3t5gnNjAzjUUovO8rgI c+5yN5heq5loYHgK6OQ9OlHzsPHO9e9MOQcKlFycs1pyijFGzDwdNUm/SchK8iWT2QApTx4A K9bCVaboTA2T77QYkRcRJYSsO1alGX0ome/hMLD1daXlkrNUp1HWa3K4iytLRXjCSIorWiGs n+q3krnpXu3TFkA8qtOFZMdnIiFuiq1yLT8hptsV5xh1TA2nsVvSYiaCr3q4s4BKjS/KrLDb qoxzw8ISjdUp4pA85vb6YLCmb39NgidD+7PmAr65lBNveIFynTgsja1rRQ4= In-Reply-To: <203f72c8-4a06-41d4-9212-9625f6be0281@ti.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 21/09/2026 19:25, Aniket Limaye wrote: > > On 21/09/26 19:40, Mika Westerberg wrote: >> On Mon, Sep 21, 2026 at 04:00:52PM +0200, Krzysztof Kozlowski wrote: >>> On 21/09/2026 13:14, Mika Westerberg wrote: >>>> Hi, >>>> >>>> On Mon, Sep 21, 2026 at 01:55:23PM +0530, Aniket Limaye wrote: >>>>> On 20/09/26 23:54, Krzysztof Kozlowski wrote: >>>>>> On Sat, Sep 19, 2026 at 02:36:06PM +0530, Aniket Limaye wrote: >>>>>>> Add the "snps,dwc-i2c" compatible for Synopsys Advanced I2C Controller >>>>>>> referred as DWC_i2c. Compared to the existing "snps,designware-i2c" >>>>>> dwc is designware, so snps,dwc-i2c = snps,designware-i2c >>>>>> >>>>>> I think this is *the* argument why generic compatibles are wrong. >>>>> These are 2 different controllers with some different registers and >>>>> vastly different register offsets. >>>>> >>>>> So, the official product name (short format) for the SNPS Advanced I2C >>>>> controller is "DWC_i2c", as per SNPS' own reference document [0]. >>>>> Whereas the original "snps,designware-i2c" corresponds to the product >>>>> name "DW_apb_i2c" as per its own databook [1]. >>>>> >>>>> So based on this I though it'd be best to keep "dwc-i2c" close to SNPS' >>>>> own naming, despite the fact that it does seem very similar to the >>>>> generic "snps,designware-i2c". >>>>> >>>>> If you'd prefer to make it more explicit, I could change this to something >>>>> like "snps,dwc-adv-i2c"? Although, again, this does deviate from the >>>>> convention that SNPS uses in it's own documents. >>>> What about just "snps,ai2c" or "snps,advanced-i2c"? >>> Can we just drop generic compatible completely instead? The block cannot >>> work alone, needs SoC integration. >> Works for me. > > Original intent was to try to develop a generic driver so that it could be > re-used by other SoCs with some more work (referring to an earlier > series [0]) > I did not comment on your driver. I did not even look there. Best regards, Krzysztof