linux-kernel - RE: [PATCH v5 1/2] dt-bindings: i2c: Add support for ASPEED i2Cv2

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Date:   Mon, 20 Feb 2023 09:50:39 +0000
From:   Ryan Chen <ryan_chen@...eedtech.com>
To:     Jeremy Kerr <jk@...econstruct.com.au>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.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>
Subject: RE: [PATCH v5 1/2] dt-bindings: i2c: Add support for ASPEED i2Cv2

Hello Jeremy,
	Thanks your review.


> -----Original Message-----
> From: Jeremy Kerr <jk@...econstruct.com.au>
> Sent: Monday, February 20, 2023 4:29 PM
> To: Ryan Chen <ryan_chen@...eedtech.com>; Rob Herring
> <robh+dt@...nel.org>; Krzysztof Kozlowski
> <krzysztof.kozlowski+dt@...aro.org>; Joel Stanley <joel@....id.au>; Andrew
> Jeffery <andrew@...id.au>; Philipp Zabel <p.zabel@...gutronix.de>;
> openbmc@...ts.ozlabs.org; linux-arm-kernel@...ts.infradead.org;
> linux-aspeed@...ts.ozlabs.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v5 1/2] dt-bindings: i2c: Add support for ASPEED i2Cv2
> 
> Hi Ryan,
> 
> > AST2600 support new register set for I2Cv2 controller, add bindings
> > document to support driver of i2cv2 new register mode controller.
> 
> Some comments inline:
> 
> > +  clock-frequency:
> > +    description:
> > +      Desired I2C bus clock frequency in Hz. default 100khz.
> > +
> > +  multi-master:
> > +    type: boolean
> > +    description:
> > +      states that there is another master active on this bus
> 
> These are common to all i2c controllers, but I see that i2c-controller.yaml
> doesn't include them (while i2c.text does).
> 
> I assume we're OK to include these in the device bindings in the meantime.
> But in that case, you may also want to include the common "smbus-alert"
> property, which you consume in your driver.
> 
Since i2c.text have multi-master, smbus-alert. I don't need those two right?

> > +  timeout:
> > +    type: boolean
> > +    description: Enable i2c bus timeout for master/slave (35ms)
> > +
> > +  byte-mode:
> > +    type: boolean
> > +    description: Force i2c driver use byte mode transmit
> > +
> > +  buff-mode:
> > +    type: boolean
> > +    description: Force i2c driver use buffer mode transmit
> 
> These three aren't really a property of the hardware, more of the intended
> driver configuration. Do they really belong in the DT?
> 
Sorry, I am confused. 
This is hardware controller mode setting for each i2c transfer. 
So I add it in property for change different i2c transfer mode.
Is my mis-understand the property setting?

> [and how would a DT author know which modes to choose?]
> 
> > +  aspeed,gr:
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +    description: The phandle of i2c global register node.
> 
> We'll probably want this to be consistent with other instances of aspeed global
> register references. I've used "aspeed,global-regs" in the proposed i3c binding:
> 
> 
> https://lore.kernel.org/linux-devicetree/cover.1676532146.git.jk@codeconstruc
> t.com.au/T/#mda2d005f77ca0c481b1f1edadb58fc1b007a5cc3
> 
> I'd argue that "global-regs" is a little more clear, but I'm okay with either way -
> that change has been Acked but not been merged yet.
> Whichever we choose though, it should be consistent.
> 
Got it, will rename to aspeed,global-regs

Best Regards, 
Ryan