linux-kernel - Re: [PATCH v2 3/4] Device bindings documentation updated ACPI-enabled platforms not currently supported

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Message-ID: <1477047272.6423.6.camel@linux.intel.com>
Date:   Fri, 21 Oct 2016 13:54:32 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Luis Oliveira <Luis.Oliveira@...opsys.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Ramiro Oliveira <Ramiro.Oliveira@...opsys.com>
Cc:     Mark Rutland <mark.rutland@....com>, jarkko.nikula@...ux.intel.com,
        mika.westerberg@...ux.intel.com, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org, CARLOS.PALMINHA@...opsys.com
Subject: Re: [PATCH v2 3/4] Device bindings documentation updated
 ACPI-enabled platforms not currently supported

On Fri, 2016-10-21 at 10:56 +0100, Luis Oliveira wrote:
> Since practically 90% of the code is shared between master and slave,
> I was
> thinking if it will be acceptable to use the same driver for both but
> differentiate the master/slave mode by the compatible strings.

It might be possible to split like other drivers do:

1. Core part (i2c-designware-core.c)
2. Master part (i2c-designware-master.c)
3. Slave part (i2c-designware-slave.c)
4. Glue drivers (like: i2c-designware-platdrv.c)

> 
> Thanks,
> Luis
> 
> On 10/18/2016 16:17, Wolfram Sang wrote:
> > > This is needed because the configuration is different and the i2c-
> > > designware
> > > cannot be master/slave without a reset. To resolve that I added
> > > this property
> > > to bind it as a slave when needed.
> > 
> > Aww, pity that the HW can't do that. Do you have details why?
> > 
> > If that is really a HW limitation, then I'd suggest having a
> > seperate
> > driver for slave-only mode so we can differentiate by compatible
> > strings.
> > 
> 
> 

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy