Subject: [PATCH] i2c: at91: add of_device_id entry for at91rm9200

From: [email-masked] (ludovic.desroches)
Date: Thu, 24 Jan 2013 08:58:28 +0100

Hi,

On 01/24/2013 08:27 AM, Wolfram Sang wrote:
> On Tue, Dec 18, 2012 at 07:02:32AM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
>> On 22:42 Wed 05 Dec     , Joachim Eastwood wrote:
>>> Signed-off-by: Joachim Eastwood <[email-masked]>
>>> ---
>>> Hi,
>>>
>>> AT91RM9200 is gaining DT support now so let's add an id to the i2c driver.
>>>
>>> Tested on custom RM9200 board. Since the driver doesn't support pinctrl
>>> muxing yet I had to add pinctrl hogs for the i2c pins in my dts for it
>>> to work.
>>
>> IIRC the i2c IP have quite a lots of issue on rm9200 and until sam9g45
>>
>> it not recommended to use it instead use i2c-gpio
>
> Ludovic, you know the driver best. Does it make sense to add this?

I didn't add this when I did the rework because there was no DT tree 
support for RM9200. The configuration for RM9200 IP is already in the 
driver and used for non DT platform so I think it makes sense to add this.

But as Jean-Christophe said, it's recommended to use the i2c-gpio driver 
since we know the first versions of the IP have several issues. However 
if it fits user usage, it is not forbidden to use it.

Regards

Ludovic

>
>>
>> Best Regards,
>> J.
>>>
>>> regards
>>> Joachim Eastwood
>>>
>>>   drivers/i2c/busses/i2c-at91.c | 3 +++
>>>   1 file changed, 3 insertions(+)
>>>
>>> diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
>>> index b4575ee..c504aa8 100644
>>> --- a/drivers/i2c/busses/i2c-at91.c
>>> +++ b/drivers/i2c/busses/i2c-at91.c
>>> @@ -584,6 +584,9 @@ static const struct platform_device_id at91_twi_devtypes[] = {
>>>   #if defined(CONFIG_OF)
>>>   static const struct of_device_id atmel_twi_dt_ids[] = {
>>>   	{
>>> +		.compatible = "atmel,at91rm9200-i2c",
>>> +		.data = &at91rm9200_config,
>>> +	} , {
>>>   		.compatible = "atmel,at91sam9260-i2c",
>>>   		.data = &at91sam9260_config,
>>>   	} , {
>>> --
>>> 1.8.0
>>>
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>
>