On Friday 15 April 2016 10:05 PM, Stephen Warren wrote:
On 04/12/2016 08:56 AM, Laxman Dewangan wrote:
NVIDIA Tegra210 supports the IO pads which can operate at 1.8V
or 3.3V I/O voltage levels. Also IO pads can be configured for
power down state if it is not in used. SW needs to configure the
voltage level of IO pads based on IO rail voltage and its power
state based on platform usage.
Add DT binding document for detailing the DT properties for
configuring IO pads voltage levels and its power state.
I hope that we only intend to use this in the case where Linux must
make dynamic changes to the IO voltage (e.g. SD cards switching
between speeds).
All static settings, and good boot defaults, should be set up by
system FW. Perhaps not all FW does this on Tegra210 platforms:-( I
hope that on future chips, the same FW that sets up the static pinmux
sets up the static IO voltage configuration, in exactly the same way.
Exactly yes.
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