linux-kernel - Re: [PATCH v1 1/1] i2c: iproc: Add i2c repeated start capability

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Message-ID: <20190831094940.GA1138@kunai>
Date:   Sat, 31 Aug 2019 11:49:41 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Ray Jui <ray.jui@...adcom.com>
Cc:     Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Lori Hikichi <lori.hikichi@...adcom.com>,
        Icarus Chau <icarus.chau@...adcom.com>,
        Shivaraj Shetty <sshetty1@...adcom.com>
Subject: Re: [PATCH v1 1/1] i2c: iproc: Add i2c repeated start capability

Hi Ray,

> > With all the limitations in place, I wonder if it might be easier to
> > implement an smbus_xfer callback instead? What is left that makes this
> > controller more than SMBus and real I2C?
> > 
> 
> Right. But what is the implication of using smbus_xfer instead of
> master_xfer in our driver?
> 
> Does it mean it will break existing functions of the i2c app that our
> customers developed based on i2cdev (e.g., I2C_RDWR)?

If the customers uses I2C_RDWR (and it cannot be mapped to i2c_smbus_*
calls) then this is an indication that there is some I2C functionality
left which the HW can provide. I'd be interested which one, though.

> 
> 1) Does

Maybe you wanted to describe it here and it got accidently cut off?

Regards,

   Wolfram


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