David Hendricks 1f091487b2 snow/stm32: re-configure power LED on the fly (input vs. pwm) ...

Usually the power LED is driven by the PWM mode so that its nominal
brightness can be set to a "soft" on value. However, when
the LED is to remain off the LED should be switched to floating
input mode. This reduces voltage leakage.

This CL updates the power_led_task to configure the LED however is
appropriate and adds board functions to re-configure the GPIO.

Signed-off-by: David Hendricks <dhendrix@chromium.org>

BRANCH=snow
BUG=chrome-os-partner:12381
TEST=LED responds as expected in suspend and on/off states, also
tested that leakage is reduced with multimeter

Change-Id: If90ac78aaffe7358cce80dd02ec1423c2cb4f664
Reviewed-on: https://gerrit.chromium.org/gerrit/29705
Reviewed-by: Simon Glass <sjg@chromium.org>
Commit-Ready: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>

2012-08-17 16:55:26 -07:00

..

lm4

Snow: WP_RO should be 0x10000 (including pstate).

2012-08-17 01:48:30 -07:00

stm32

snow/stm32: re-configure power LED on the fly (input vs. pwm)

2012-08-17 16:55:26 -07:00