From 657deac015e3779c1cdca837cf0f1b77b93baa54 Mon Sep 17 00:00:00 2001 From: Furquan Shaikh Date: Fri, 10 Jul 2015 17:36:49 -0700 Subject: smaug: Set LDO2 voltage to 1.8V LDO2 regulator is used as an always-on reference for the droop alert circuit. Set output voltage to match kernel settings. CQ-DEPEND=CL:284649 BUG=chrome-os-partner:42305 BRANCH=None TEST=Compiles successfully and boots to kernel prompt Change-Id: I5ef4e266d8ec278dadffa846af8dc49b6d18c37e Signed-off-by: Patrick Georgi Original-Commit-Id: 611465f6248cba0ddce0083b431cb7ee17bc4b4c Original-Change-Id: I58cc473452b871392d813387707a0b8288e46561 Original-Signed-off-by: Furquan Shaikh Original-Reviewed-on: https://chromium-review.googlesource.com/284879 Original-Tested-by: Furquan Shaikh Original-Reviewed-by: Aaron Durbin Original-Commit-Queue: Furquan Shaikh Original-Trybot-Ready: Furquan Shaikh Reviewed-on: http://review.coreboot.org/10900 Reviewed-by: Stefan Reinauer Tested-by: build bot (Jenkins) --- src/mainboard/google/smaug/pmic.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'src/mainboard/google/smaug') diff --git a/src/mainboard/google/smaug/pmic.c b/src/mainboard/google/smaug/pmic.c index 73aa0de83c..b10e67b0ee 100644 --- a/src/mainboard/google/smaug/pmic.c +++ b/src/mainboard/google/smaug/pmic.c @@ -95,6 +95,13 @@ void pmic_init(unsigned bus) pmic_write_reg_77620(bus, MAX77620_CNFG2SD_REG, 0x04, 1); pmic_write_reg_77620(bus, MAX77620_SD1_REG, 0x2a, 1); + /* + * MAX77620: Set LDO2 output to 1.8V. LDO2 is used as always-on + * reference for the droop alert circuit. Match this setting with what + * the kernel expects. + */ + pmic_write_reg_77620(bus, MAX77620_CNFG1_L2_REG, 0x14, 1); + /* MAX77621: Set VOUT_REG to 1.0V - CPU VREG */ pmic_write_reg_77621(bus, MAX77621_VOUT_REG, 0xBF, 1); -- cgit v1.2.3