[PATCH v5 0/13] arm64: allwinner: a64: Enable MMC support

Hi,

On Sat, Jan 28, 2017 at 08:44:02PM +0800, Chen-Yu Tsai wrote:

On Sat, Jan 28, 2017 at 5:38 AM, Maxime Ripard
[off-list ref] wrote:

quoted

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.

Whole series is

Acked-by: Chen-Yu Tsai <redacted>

Seems that we don't need to increase the signal drive strength for eMMC
on the A64? This is probably a good thing.

From what I've seen, Allwinner still recommends using a 30mA drive

strength, so that doesn't seem needed.

Maxime

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