linux-kernel - Re: [PATCH v10 5/8] dt-bindings: media: add TI DS90UB960 FPD-Link III Deserializer

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Date:   Wed, 19 Apr 2023 09:13:36 +0200
From:   Luca Ceresoli <luca.ceresoli@...tlin.com>
To:     Wolfram Sang <wsa@...nel.org>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Matti Vaittinen <Matti.Vaittinen@...rohmeurope.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Peter Rosin <peda@...ntia.se>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Michael Tretter <m.tretter@...gutronix.de>,
        Hans Verkuil <hverkuil@...all.nl>,
        Mike Pagano <mpagano@...too.org>,
        Krzysztof Hałasa <khalasa@...p.pl>,
        Marek Vasut <marex@...x.de>,
        Satish Nagireddy <satish.nagireddy@...cruise.com>,
        Rob Herring <robh@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v10 5/8] dt-bindings: media: add TI DS90UB960 FPD-Link
 III Deserializer

Hi Wolfram, Tomi,

On Tue, 18 Apr 2023 15:06:10 +0200
Wolfram Sang <wsa@...nel.org> wrote:

> > +  i2c-alias-pool:
> > +    $ref: /schemas/types.yaml#/definitions/uint16-array
> > +    description:
> > +      I2C alias pool is a pool of I2C addresses on the main I2C bus that can be
> > +      used to access the remote peripherals on the serializer's I2C bus. The
> > +      addresses must be available, not used by any other peripheral. Each
> > +      remote peripheral is assigned an alias from the pool, and transactions to
> > +      that address will be forwarded to the remote peripheral, with the address
> > +      translated to the remote peripheral's real address. This property is not
> > +      needed if there are no I2C addressable remote peripherals.  
> 
> After some initial discussion with Tomi on IRC, this question is
> probably more for Luca:
> 
> Why is "i2c-alias-pool" in the drivers binding and not a regular i2c
> binding? Same question for the implementation of the alias-pool
> handling. Shouldn't this be in the i2c-atr library? I'd think managing
> the list of aliases would look all the same in the drivers otherwise?

I think that this _was_ the plan, as it looks obviously cleaner, but
then we agreed that we should remove the pool entirely, so I didn't
bother moving it.

Best regards,
Luca

-- 
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com