[U-Boot] [PATCH 3/4] ARM: dts: am57xx: Disable voltage switching for SD card

[Tom Rini]

On Thu, Jun 20, 2019 at 03:07:21PM +0530, Faiz Abbas wrote:

> If UHS speed modes are enabled, a compatible SD card switches down to 1.8V
> during enumeration. If after this a software reboot/crash takes place and
> on-chip ROM tries to enumerate the SD card, the difference in
> IO voltages (host @ 3.3V and card @ 1.8V) may end up damaging the card.
> 
> The fix for this is to have support for power cycling the card in
> hardware (with a PORz/soft-reset line causing a power cycle of the card).
> Because the beaglebone X15 (rev A,B and C), am57xx-evms and am57xx-idks don't
> have this capability, disable voltage switching for these boards.
> 
> The major effect of this is that the maximum supported speed mode is now
> high speed(50 MHz) down from SDR104(200 MHz).
> 
> Signed-off-by: Faiz Abbas <faiz_abbas at ti.com>

Applied to u-boot/master, thanks!

-- 
Tom
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