linux-kernel - Re: [PATCH 02/13] dt-bindings: i2c: nomadik: add mobileye,eyeq5-i2c bindings and example

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Date: Fri, 16 Feb 2024 11:33:01 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Théo Lebrun <theo.lebrun@...tlin.com>,
 Rob Herring <robh@...nel.org>
Cc: Linus Walleij <linus.walleij@...aro.org>,
 Andi Shyti <andi.shyti@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-mips@...r.kernel.org, Gregory Clement <gregory.clement@...tlin.com>,
 Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 Tawfik Bayouk <tawfik.bayouk@...ileye.com>
Subject: Re: [PATCH 02/13] dt-bindings: i2c: nomadik: add mobileye,eyeq5-i2c
 bindings and example

On 16/02/2024 11:18, Théo Lebrun wrote:
> 
>>> +        mobileye,id:
>>> +          $ref: /schemas/types.yaml#/definitions/uint32
>>> +          description: Platform-wide controller ID (integer starting from 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 
>> 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.

Which register?  Your devices do not share IO address space.

> Index is used to compute the shift.
> 
> mobileye,olb is a phandle to a syscon. I'll be using i2cN aliases I
> guess.
> 
> Thanks,
> 
> --
> Théo Lebrun, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com

Best regards,
Krzysztof