cdev name generation

[Marc Reilly]

Hi Sascha,

> > 
> > Do you mean something like this attached patch?
> 
> Yes
> 
> > I preferred having the possibilty for assigning the id, so that boards
> > can have some expectations of what the device name will be.
> 
> Generally a good idea, but how do you want to pass previd to the drivers
> using it? via platform_data? I haven't looked into it to see if this
> works well.
> 

That's what I did for the at24, (although preferred_id would be a better name 
than just id)

static struct at24_platform_data at24_data = {
	.size	= 2048 / 8,
	.id		= 1,
};


static int at24_probe(struct device_d *dev)
{
	struct at24 *at24;
	struct at24_platform_data *pdata;
	at24 = xzalloc(sizeof(*at24));

	dev->priv = at24;
	pdata = dev->platform_data;

	at24->cdev.name = make_cdev_name("eeprom", pdata->id);
	at24->client = to_i2c_client(dev);
	at24->cdev.size = pdata->size;
	at24->cdev.dev = dev;


Maybe the platform data should have the preferred cdev name also? In the 
example above, the driver just blindly calls it "eeprom", ie a more generic 
term than "at24", the driver name.
If the desired end result is to have for example eeprom0, eeprom1 and eeprom2 
cdevs all from potentially different drivers then I makes sense to also be 
able to specify the "eeprom" part. (and then we'd probably want to pass in the 
device_d* to make_cdev_name in case the user doesn't specify a cdev name - the 
device name, and id, could be used).

Seems like too much thinking for so little code :)

Cheers,
Marc