linux-kernel - Re: [PATCH v4 02/11] dt-bindings: i2c: Discard i2c-slave flag from the DW I2C example

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Date:   Wed, 27 May 2020 20:56:24 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Rob Herring <robh@...nel.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-mips@...r.kernel.org, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 02/11] dt-bindings: i2c: Discard i2c-slave flag from
 the DW I2C example

On Wed, May 27, 2020 at 08:18:41PM +0300, Serge Semin wrote:
> On Wed, May 27, 2020 at 11:12:04AM -0600, Rob Herring wrote:
> > On Wed, May 27, 2020 at 03:01:02PM +0300, Serge Semin wrote:
> > > dtc currently doesn't support I2C_OWN_SLAVE_ADDRESS flag set in the
> > > i2c "reg" property. If it is the compiler will print a warning:
> > > 
> > > Warning (i2c_bus_reg): /example-2/i2c@...0000/eeprom@64: I2C bus unit address format error, expected "40000064"
> > > Warning (i2c_bus_reg): /example-2/i2c@...0000/eeprom@64:reg: I2C address must be less than 10-bits, got "0x40000064"
> > > 
> > > In order to silence dtc up let's discard the flag from the DW I2C DT
> > > binding example for now. Just revert this commit when dtc is fixed.

> > >        eeprom@64 {
> > >          compatible = "linux,slave-24c02";
> > > -        reg = <0x40000064>;
> > > +        reg = <0x64>;
> > 
> > But the compatible is a slave, so you need an example with a different 
> > device.
> 

> Ok. I'll replace the sub-node with just "atmel,24c02" compatible string then.

But how it will be different to the another slave connected to the master?

This example is specifically to show that DesingWare I²C controller may be
switched to slave mode.

> > >        };
> > >      };
> > >    - |

-- 
With Best Regards,
Andy Shevchenko