On Mon, Sep 02, 2013 at 09:49:20AM +0000, Opensource [Adam Thomson] wrote: Please fix your mailer to wrap within 80 columns, it makes your mails very hard to read if you don't do this.
> At present I believe your suggestion is to instantiate the codec regmap in > the MFD > core for the PMIC, and then pass this in as part initialisation of the codec > driver, > from the PMIC. Please correct me if I'm wrong. That's correct. > If I'm correct then to me this doesn't make sense. The devices are separate, > and have completely independent register maps. As such I believe the > instantiation They are not separate, they are soldered to the board as part of the same package - quite a few other devices use a similar scheme and are also handled in this fashion (the TI TWL devices are one example). > 2) Including the above change, add some optional code to the PMIC MFD core > which > uses 'i2c_new_device()' to instantiate the codec, if it's required (I guess > indicated by > platform data to the PMIC). Means the Codec can still be used as is, but the > PMIC core > code can, if required, instantiate the codec. This is roughly what ends up happening, you do need to instantiate another I2C client no matter what. The important thing here is that the CODEC does not need to be separately registered by the user, if it really is only the I2C client that needs creating that's probably OK so long as the user doesn't need to worry about that implementation detail. > I personally believe option 2 seems unnecessary and it would be simple enough > just to instantiate the codec driver from machine code, as is done for many > standalone > codecs. Am interested though in understanding the reasoning behind your > suggestion, > for devices like this which are completely independent but can share the same > HW > package. I currently don't see a good reason to make PMIC MFD core > instantiate the > codec, for this type of scenario, but maybe you see something I don't? The reasoning is simply that if the chip design solders a single device to the board then the software system integration should register a single device with the system.
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