On Thu, Mar 15, 2012 at 9:58 PM, Arnd Bergmann [off-list ref] wrote:

[Per]

quoted

The stedma40 filter function is not really specific for ux500. ux500
use stedma40 but it should be possible to replace this DMA.IP with
some other DMA-controller. This is board specific configuration. You
should not need to change the mmci-driver just because the dma-driver
has changed, right?
Or will the board-configuration now be placed in mmci-ux500?

Right, the DMA configuration does not really belong in there, but
the voltage setup might (unless we convert that to the regulator
setup).

The voltage to power the card is already using the regulator
framework with the MMC-specific helpers in the MMCI driver.

But I guess you're after modelling the levelshifter as a regulator?

Basically the level shifter is a separate device has two voltage
inputs A and B (from other regulators) that is controlled by a
simple GPIO to select voltage A or B to drive the signals to
the card.

That could probably be modelled as a regulator with two
volategs for sure, but then we should maybe create a more
generic "struct level_shifter_regulator" (or whatever) for the
concept as a whole.

Let's page Mark about what to do with levelshifters and whether
they are regulators of sorts in his book.

Yours,
Linus Walleij