Re: [PATCH] I2C: BCM2835: Linking platform nodes to adapter nodes

[Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>]

On 11/08/2013 09:59 AM, Stephen Warren wrote:
> On 11/08/2013 02:49 AM, Florian Meier wrote:
>> In order to find I2C devices in the device tree, the platform nodes
>> have to be known by the I2C core. Analogous to the i2c-omap driver
>> this requires setting the dev.of_node parameter of the adapter.
> 
> (CCing the I2C maintainers...)
> 
>> diff --git a/drivers/i2c/busses/i2c-bcm2835.c b/drivers/i2c/busses/i2c-bcm2835.c
> 
>> @@ -299,6 +299,7 @@ static int bcm2835_i2c_probe(struct platform_device *pdev)
>>  	strlcpy(adap->name, "bcm2835 I2C adapter", sizeof(adap->name));
>>  	adap->algo = &bcm2835_i2c_algo;
>>  	adap->dev.parent = &pdev->dev;
>> +	adap->dev.of_node = pdev->dev.of_node;
> 
> Ah, that makes sense. Thinking about it now, I'd only ever used i2cget
> etc. to access I2C devices, rather than instantiating drivers from DT.
> 
> That all said, I wonder if the I2C core shouldn't do something like the
> following inside i2c_add_adapter():
> 
> if (!adap->dev.of_node && adap->dev.parent)
> 	adap->dev.of_node = adap->dev.parent->of_node;
> 
> That would save every single I2C driver from having to set up this field
> manually.

BTW, this should probably be:
Cc: stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org