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SubjectRe: [PATCH] I2C: BCM2835: Linking platform nodes to adapter nodes
On Fri, Nov 08, 2013 at 09:59:28AM -0700, 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;

Should this not also have an of_node_get to increment the ref
count on the node?

Thanks,
Charles


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