linux-kernel - Re: [PATCH v3 3/5] i2c: designware: Add slave definitions

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Date:   Wed, 23 Nov 2016 14:36:28 +0000
From:   Luis Oliveira <Luis.Oliveira@...opsys.com>
To:     Rob Herring <robh@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     Luis Oliveira <Luis.Oliveira@...opsys.com>, <wsa@...-dreams.de>,
        <mark.rutland@....com>, <jarkko.nikula@...ux.intel.com>,
        <mika.westerberg@...ux.intel.com>, <linux-i2c@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <Ramiro.Oliveira@...opsys.com>, <Joao.Pinto@...opsys.com>,
        <CARLOS.PALMINHA@...opsys.com>
Subject: Re: [PATCH v3 3/5] i2c: designware: Add slave definitions

OK, I will create a "mode" string property in the devicetree that can be
"master" or "slave".


Thank you all,

Luis

On 18-Nov-16 17:01, Rob Herring wrote:
> On Fri, Nov 18, 2016 at 02:35:52PM +0200, Andy Shevchenko wrote:
>> On Fri, 2016-11-18 at 11:19 +0000, Luis Oliveira wrote:
>>>  - Add slave defintitions to i2c-designware-core
>>>  - Changes in Kconfig to auto-enable I2C_SLAVE when compiling the
>>> modules
>>>  - Add compatible string to designware-core.txt explaining the
>>> devicetree bindings
>>>
>>
>>> --- a/Documentation/devicetree/bindings/i2c/i2c-designware.txt
>>> +++ b/Documentation/devicetree/bindings/i2c/i2c-designware.txt
>>> @@ -2,7 +2,9 @@
>>>  
>>>  Required properties :
>>>  
>>> - - compatible : should be "snps,designware-i2c"
>>> + - compatible : should be:
>>> +   - "snps,designware-i2c" to setup the hardware block as I2C master.
>>> +   - "snps,designware-i2c-slave" to setup the hardware block as I2C
>>> slave.
>> Not sure about this one.
>>
>> Compatible string is more generic than list of modes. Basically you have
>> to add a property which selects mode.
> Yes, agreed. And come up with a common property.
>
>> DT people's ACK is a must for this change.
>>
>>
>> --- a/drivers/i2c/busses/Kconfig
>>> +++ b/drivers/i2c/busses/Kconfig
>>> @@ -470,6 +470,7 @@ config I2C_DESIGNWARE_CORE
>>>  config I2C_DESIGNWARE_PLATFORM
>>>  	tristate "Synopsys DesignWare Platform"
>>>  	select I2C_DESIGNWARE_CORE
>>> +	select I2C_SLAVE
>>>
>> Common rule, generic dependencies usually go first
>>
>> 	select I2C_SLAVE
>>  	select I2C_DESIGNWARE_CORE
>>
>> -- 
>> Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>> Intel Finland Oy

-- 
Best regards,
Luis