Hi Ulf,

On Mon, Jan 16, 2017 at 05:56:50PM +0100, Maxime Ripard wrote:

Hi,

Here is a new attempt at getting the MMC controllers running, following the
work done by Andre.

This has been tested on a board with one SDIO device (a Marvell WiFi chip)
and a Kingston eMMC with 1.8V IOs.

For SDIO, the HS DDR mode works just fine. That serie also enables the
SDR104 mode to work on the devices that are capable of this.

For the eMMC, HS200 with the voltage switch works. HS400 doesn't at the
moment, but since it's significantly more complex, and at the same time
Allwinner recommends to limit its frequency to 100MHz, this doesn't have
any benefits. If there's any at some point, this can be added later.

Unless you have objections, I'd really like this to be in
4.11. There's a bunch of things where I'm not entirely sure
(especially the clock gating part), it would be great if you could
have a look.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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