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authorSangbeom Kim <sbkim73@samsung.com>2012-06-18 09:49:20 +0900
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-06-19 12:06:32 +0100
commitc848bc8538cd29e92223d5e72e8fb60e6f2e176e (patch)
treea7a40e51dc2efafc2a25959cb05f7bf9cf71732e /drivers/regulator/tps65023-regulator.c
parent852abad238da723efac29f3e78dd768c18d6a062 (diff)
downloadlinaro-lsk-c848bc8538cd29e92223d5e72e8fb60e6f2e176e.tar.gz
regulator: s5m8767a: Support AP watchdog reset operation
The S5M8767A can't know status of ap reset. So, After AP watchdog reset, AP can't boot normally. Problem can be happened like below condition. - AP Bootable lowest voltage(vdd_arm): 0.9v - AP DVFS voltage table: 0.8v, 0.9v, 1.0v - During AP works on lowest voltage(0.8V), watchdog reset is asserted - AP can't boot, because vdd arm is still 0.8v Solution - Basic concept: After ap watchdog reset, GPIO configuration is changed by default value - S5M8767A has function of voltage control with gpio (8 levels with 3 gpios) - Set bootable voltage on level 0 -> can work with default gpio configuration - In the probing, Change voltage control level from level 0 to level 1 - Execute normal dvfs operation on level 1 - After watchdog reset, ap gpio is set by default value - PMIC operation mode is changed by ap reset (level1 -> level0) - Regardless of previous vdd_arm voltage, AP always can be booted. Signed-off-by: Sangbeom Kim <sbkim73@samsung.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/regulator/tps65023-regulator.c')
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