linux-kernel - Re: [PATCH v4 3/5] i2c: designware: Add slave definitions

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Date:   Mon, 12 Dec 2016 17:15:56 -0600
From:   Rob Herring <robh@...nel.org>
To:     Luis de Oliveira <Luis.Oliveira@...opsys.com>
Cc:     "wsa@...-dreams.de" <wsa@...-dreams.de>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "jarkko.nikula@...ux.intel.com" <jarkko.nikula@...ux.intel.com>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Ramiro.Oliveira@...opsys.com" <Ramiro.Oliveira@...opsys.com>,
        "Joao.Pinto@...opsys.com" <Joao.Pinto@...opsys.com>,
        "CARLOS.PALMINHA@...opsys.com" <CARLOS.PALMINHA@...opsys.com>
Subject: Re: [PATCH v4 3/5] i2c: designware: Add slave definitions

On Mon, Dec 12, 2016 at 12:35 PM, Luis de Oliveira
<Luis.Oliveira@...opsys.com> wrote:
> Hi all,

Please don't top post.

>
> The slave address could be set by the I2C slave backend so I can't use it to setup the controller.
> A boolean property was my initial approach then Andy and Wolfram Sang suggested the use of compatible strings and later It was suggested to use a property to select mode but I can do it again if it's the best way.
> Can you please tell me where should it be documented?

bindings/i2c/i2c.txt.

Actually, looking at this some more, we already have a way to describe
the controller being a slave device with the I2C_OWN_SLAVE_ADDRESS
flag in the reg property. We should just need a helper to read reg
property of each child and check for the bit set.

Rob