On Tue, Sep 27, 2011 at 1:42 PM, Ulf Hansson <ulf.hansson@xxxxxxxxxxxxxx> wrote: > The purpose of the vdd_handler does not make sense. We remove it > and use a generic approach instead. A new ios_handler is added, the > purpose of which e.g. can be to control GPIO pins to a levelshifter. > > Previously the vdd_handler was also used for making additional > changes to the power register bits. This option is superfluous and is > therefore removed. > > Adaptaptions from the old vdd_handler to the new ios_handler is done for > mach-ux500 board, which was the only one using the vdd_handler. I've tried to undestand (by reading the data sheets I have) what the purpose of the original 4 power bits handled by the mechanism that nobody really use is, and I'm still lost. I'm guessing it was some feature intended to control e.g. a regulator of some kind by routing them off-chip (since mixed-signal chips rarely have MMC controllers inside...) and most designers already have their own regulator designs so it made no sense for anyone to actually implement it that way. If some vendor would actually start using these bits for the intended purpose I guess we could adapt. (The pirate driver msm_sdcc.c does not seem to use these bits either BTW.) Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
