On Wednesday 14 January 2009, Pillai, Manikandan wrote: > Let me summarise the main problem I have been facing with regulators. > > The TPS6235x are I2C based devices. > > The regulator_register() functions require that the regulator_init_data is > passed as platform_data(). But for i2c_client's platform data is initialized > to some other value in the I2C driver. So the regulator_register() function > fails.
Then you're initializing the i2c_board_info.platform_data field incorrectly. Do that right (pass regulator_init_data), and this problem vanishes. Only the tps6235x.c driver, and in this case the regulator framework (sigh), care about that platform_data. > The other problem which I encounter is with the function regulator_get(). > Regulator_get() requires 2 parameters - device pointer should point to the > One passed during regulator_register. It also takes a string a second > parameter > Which is compared with the supply string initialized in the regulator init > data > element regulator_consumer_supply.supply. You need to intialize regulator_init_data.consumer_supplies (and num_consumer_supplies) to include those two parameters. Your pr785.c file will need to set up the regulator_init_data before it declares the regulators. (And yes, there *could* be a chicken/egg problem there where it gets awkward to get all those devices in hand -- and pass them to the regulator framework -- before their probe routines get called and try using their regulators. So far, careful initcall sequencing has sufficed to resolve that...) > Passing the client->dev, invoking regulator_register() fails. Of course. That's the regulator -- an I2C device -- not the regulated device. You pass regulator_get() the name of the regulated device and a logical name for its supply regulator. It then looks for data from a regulator_consumer_supply, which was handed to the regulator framework via regulator_init_data. Remember: the whole point of a driver using regulator_get() to get a client handle to its supply regulator is that it won't already *have* any knowledge about what regulator is used on any given board. - Dave -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
