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

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Message-ID: <ZD6VwpRya6SGBAt5@shikoro>
Date:   Tue, 18 Apr 2023 15:06:10 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     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>,
        Luca Ceresoli <luca.ceresoli@...tlin.com>,
        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


> +  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?


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