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Fri, 12 Sep 2025 06:37:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 647BDC4CEF4; Fri, 12 Sep 2025 06:37:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1757659079; bh=FoKfA+Ido5KJFJFtC9Cz3p8xOCs463YOvLfdHV84F2k=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=MkOArNCDNfzMto9SJgAlT1LbW6DrUzhR2Og1Vjjfeu4YpaG4uOkCA0ELSDBCDOGyn wlzWq24sAELOx8iUeu0ez1jPuKjprH+fVF9lwvegPO149q27ItPoKlXoo12JE2Dqca oRm5/dkfdXUSHiJCYIp8MnZFRiVrigz6eXotiwSc0zbv9A35MoKHQJO4yN/xpGoa0Y JUGo0J2O0g550qO/X0dqEG1Ug5RASlGHkasJt7ZHntSl4mQ7hrcWkQYaIM3r/ul4Yg kIppaAN8Hg8RtTppWTA8vMlguYABqMXtBL5DJQQvmcgMTfmOVLuEz/eFmTmeJhpXdh Of5GMaKRdneJQ== Message-ID: <6feb419e-ee3d-4573-8820-19c70acdb426@kernel.org> Date: Fri, 12 Sep 2025 08:37:53 +0200 X-Mailing-List: openbmc@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v16 1/3] dt-bindings: i2c: aspeed: support for AST2600-i2cv2 To: Jeremy Kerr , Ryan Chen Cc: "robh@kernel.org" , "conor+dt@kernel.org" , "andriy.shevchenko@linux.intel.com" , "andi.shyti@kernel.org" , "linux-aspeed@lists.ozlabs.org" , "devicetree@vger.kernel.org" , "openbmc@lists.ozlabs.org" , Mo Elbadry , "linux-kernel@vger.kernel.org" , "joel@jms.id.au" , "p.zabel@pengutronix.de" , "krzk+dt@kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-i2c@vger.kernel.org" References: <20250224055936.1804279-1-ryan_chen@aspeedtech.com> <994cb954-f3c4-4a44-800e-9303787c1be9@kernel.org> <4523caea-3406-4de0-9ab5-424fb7a0a474@kernel.org> <8e8aa069-af9f-453f-9bd0-e3dc2eab59ab@kernel.org> <99053328-a117-493e-b5f3-00902669c8e7@kernel.org> <44ef5c93448a3625fcfd003b47a516e8ba795b62.camel@ozlabs.org> <52943e49aaea7bb6def5bc51dfd57392b6ae66e4.camel@ozlabs.org> <3fdee5330d91b5d18a69a311e4df6de874973ced.camel@ozlabs.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 11/09/2025 11:03, Jeremy Kerr wrote: > Hi all, > > After a bit of a chat with Ryan, some updates on this: > >> The question was more: it sounds like you're switching between >> *fundamentally different* hardware units with the mux switch - not just >> a different register interface for the same peripheral hardware. Is that >> the case? > > Turns out: no. The controller core is the same, but what gets muxed > in/out is more of a compatibility interface. This provides an > ast2500-like register set to the ast2600 i2c peripheral. If you had two separate bindings, how would you represent it in DTS? Two device nodes, right? That's confusing, because there is only one device. If the device can present or change its programming interface, it is still that device, so still one binding for it. And that device driver will handle both (or one) programming models. I remember now the problem we talk about, but I don't get what exactly you want to solve/discuss. Anyway any discussion should be about newest patch, not something from February, so if you still have concerns please raise them at v18 (or whichever version is now). Best regards, Krzysztof