MMC: mmci: Provide bindings for Device Tree
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| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 2/5 | MMC: mmci: Seperate ARM variants from generic code | +0 | 1 reply |
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Cover letter [PATCH 0/5] MMC: mmci: Provide bindings for Device Tree
Quoted 23 lines · Linus Walleij
Quoted 11 lines · Arnd Bergmann
[Per]
Quoted 6 lines
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.
Quoted 4 lines
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.
Ok, thanks for the explanation.
Quoted 2 lines
Let's page Mark about what to do with levelshifters and whether they are regulators of sorts in his book.
It does sound appealing, especially because this one could be done completely generically by defining a regulator that has a bunch of other regulators as well as a set of gpio lines as inputs and one output that can be used in other devices. We would probably only use this one together with device tree then.
Arnd