linux-kernel - RE: [PATCH v16 1/3] dt-bindings: i2c: aspeed: support for AST2600-i2cv2

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Message-ID:
 <OS8PR06MB7541C3B70B15F45F4824772BF2D92@OS8PR06MB7541.apcprd06.prod.outlook.com>
Date: Wed, 19 Mar 2025 11:12:10 +0000
From: Ryan Chen <ryan_chen@...eedtech.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: "benh@...nel.crashing.org" <benh@...nel.crashing.org>, "joel@....id.au"
	<joel@....id.au>, "andi.shyti@...nel.org" <andi.shyti@...nel.org>,
	"robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
	<krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
	"andrew@...econstruct.com.au" <andrew@...econstruct.com.au>,
	"p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
	"andriy.shevchenko@...ux.intel.com" <andriy.shevchenko@...ux.intel.com>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-aspeed@...ts.ozlabs.org"
	<linux-aspeed@...ts.ozlabs.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, Mo Elbadry <elbadrym@...gle.com>
Subject: RE: [PATCH v16 1/3] dt-bindings: i2c: aspeed: support for
 AST2600-i2cv2

> 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.


> 
> Best regards,
> Krzysztof