tree 4c4e5e012458f9cde3345b3c98f94684d15202a1
parent 9a520208cb6b1869bd4d07a8a67e0b943980cf7a
author Marcel Ziswiler <marcel.ziswiler@toradex.com> 1438814824 +0200
committer Tom Warren <twarren@nvidia.com> 1439496362 -0700

colibri_t20: disable PMIC sleep mode on low supply voltage

The Colibri T20's PMIC enters a sleep mode on low supply voltage < 3.0V
±2.5% (2.92...3.08V). Rising the main supply voltage again does not
bring it back to regular operation. Not even a full reset does bring
the module back. A full power cycle was required to reboot the system.
A long positive pulse on the PMICs resume pin also reboots the system
but this pin is only accessible as a test point on the module.

This patch configures the PMIC through I2C to not enter this sleep mode
plus force it to normal state upon sleep request exit should this ever
happen.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>