Re: [PATCH v5 2/8] i2c: add I2C Address Translator (ATR) support

[Andy Shevchenko]

On Thu, Dec 08, 2022 at 06:01:19PM +0200, Tomi Valkeinen wrote:
> On 08/12/2022 14:53, Andy Shevchenko wrote:
> > On Thu, Dec 08, 2022 at 12:40:00PM +0200, Tomi Valkeinen wrote:

...

> > > +	if (bus_handle) {
> > > +		device_set_node(&chan->adap.dev, fwnode_handle_get(bus_handle));
> > 
> > I believe the correct way, while above still works, is
> > 
> > 		device_set_node(&chan->adap.dev, bus_handle);
> > 		fwnode_handle_get(dev_fwnode(&chan->adap.dev));
> 
> Hmm, why is that correct? Shouldn't you give device_set_node() an fwnode
> that has been referenced?

You take a reference on the adap->dev and not on input. It's just a logical,
But as I said your variant still works.

> > But I agree that this looks a bit verbose. And...
> > 
> > > +	} else {
> > > +		struct fwnode_handle *atr_node;
> > > +		struct fwnode_handle *child;
> > > +		u32 reg;
> > > +
> > > +		atr_node = device_get_named_child_node(dev, "i2c-atr");
> > > +
> > > +		fwnode_for_each_child_node(atr_node, child) {
> > > +			ret = fwnode_property_read_u32(child, "reg", &reg);
> > > +			if (ret)
> > > +				continue;
> > > +			if (chan_id == reg)
> > > +				break;
> > > +		}
> > > +
> > > +		device_set_node(&chan->adap.dev, child);
> > 
> > ...OTOH, you set node with bumped reference here. So I leave all this to
> > the maintainers.
> > 
> > > +		fwnode_handle_put(atr_node);
> > > +	}

...

> > > +static inline void i2c_atr_set_clientdata(struct i2c_atr *atr, void *data)
> > > +{
> > > +	atr->priv = data;
> > > +}
> > > +
> > > +static inline void *i2c_atr_get_clientdata(struct i2c_atr *atr)
> > > +{
> > > +	return atr->priv;
> > > +}
> > 
> > The function names are misleading, because I would think this is about driver
> > data that has been set.
> > 
> > I would rather use name like
> > 
> > 	i2c_atr_get_priv()
> > 	i2c_atr_set_priv()
> 
> Indeed, set_clientdata is probably wrong. But i2c_atr_set_priv() sounds like
> it's private to the i2c-atr itself. Maybe i2c_atr_set_driver_data?

Works for me.

-- 
With Best Regards,
Andy Shevchenko