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Date: Fri, 16 Feb 2024 11:18:22 +0100
Message-Id: <CZ6FD7EHIJDT.32IEDVT9FG2GP@bootlin.com>
From: =?utf-8?q?Th=C3=A9o_Lebrun?= <theo.lebrun@bootlin.com>
Subject: Re: [PATCH 02/13] dt-bindings: i2c: nomadik: add mobileye,eyeq5-i2c
 bindings and example
Cc: "Linus Walleij" <linus.walleij@linaro.org>, "Andi Shyti"
 <andi.shyti@kernel.org>, "Krzysztof Kozlowski"
 <krzysztof.kozlowski+dt@linaro.org>, "Conor Dooley" <conor+dt@kernel.org>,
 "Thomas Bogendoerfer" <tsbogend@alpha.franken.de>,
 <linux-arm-kernel@lists.infradead.org>, <linux-i2c@vger.kernel.org>,
 <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
 <linux-mips@vger.kernel.org>, "Gregory Clement"
 <gregory.clement@bootlin.com>, "Vladimir Kondratiev"
 <vladimir.kondratiev@mobileye.com>, "Thomas Petazzoni"
 <thomas.petazzoni@bootlin.com>, "Tawfik Bayouk"
 <tawfik.bayouk@mobileye.com>
To: "Rob Herring" <robh@kernel.org>
References: <20240215-mbly-i2c-v1-0-19a336e91dca@bootlin.com>
 <20240215-mbly-i2c-v1-2-19a336e91dca@bootlin.com>
 <20240216022227.GA850600-robh@kernel.org>
In-Reply-To: <20240216022227.GA850600-robh@kernel.org>

Hello,

On Fri Feb 16, 2024 at 3:22 AM CET, Rob Herring wrote:
> On Thu, Feb 15, 2024 at 05:52:09PM +0100, Th=C3=A9o Lebrun wrote:
> > Add EyeQ5 bindings to the existing Nomadik I2C dt-bindings. Add the two
> > EyeQ5-specific properties behind a conditional. Add an example for this
> > compatible.

[...]

> > +allOf:
> > +  - $ref: /schemas/i2c/i2c-controller.yaml#
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: mobileye,eyeq5-i2c
> > +    then:
> > +      properties:
> > +        mobileye,olb:
> > +          $ref: /schemas/types.yaml#/definitions/phandle
> > +          description: A phandle to the OLB syscon.
>
> Define properties at the top-level and then restrict them in if/then=20
> schemas.

Noted, thanks.

> > +        mobileye,id:
> > +          $ref: /schemas/types.yaml#/definitions/uint32
> > +          description: Platform-wide controller ID (integer starting f=
rom zero).
>
> instance indexes are a NAK. You can use i2cN aliases if you must.
>
> Why do you need it? To access OLB? If so, add cell args to the OLB=20
> phandle instead.

Why we do what we do: I2C controller must write a 2 bit value depending
on the bus speed. All I2C controllers write into the same register.
Index is used to compute the shift.

mobileye,olb is a phandle to a syscon. I'll be using i2cN aliases I
guess.

Thanks,

--
Th=C3=A9o Lebrun, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com