At implementation of charging support for Lenovo Yoga Book (Intel Cherry Trail based with Whiskey Cove PMIC), two pitfalls were found:
- for detection of charger type by PMIC, bit 6 in the CHGRCTRL1 register should be set in 0 (and set to 1 for Host mode). Pick up its definition and logic from from Intel code drop[1]; - "#CHARGE ENABLE" signal of external charger (bq25892) in Yoga Book is connected to one of PMIC outputs controlled by CHGDISCTRL register. Enable charging at driver initialization. Pick up this from Lenovo's code drop[2,3]. Please keep in mind that I have no docs for Whiskey Cove PMIC, so this patches are based on some kind of reverse engineering and suppositions, correct me if this semantic is wrong for common case. [1]. https://github.com/01org/ProductionKernelQuilts/uefi/cht-m1stable/patches/0001-power_supply-intel-pmic-ccsm-driver.patch [2]. https://github.com/jekhor/yogabook-linux-android-kernel/blob/b7aa015ab794b516da7b6cb76e5e2d427e3b8b0c/drivers/power/bq2589x_charger.c#L2257 [3]. https://github.com/01org/ProductionKernelQuilts/uefi/cht-m1stable/patches/EM-Charger-Disable-battery-charging-in-S3-and-enable.patch Yauhen Kharuzhy (2): extcon-intel-cht-wc: Make charger detection co-existed with OTG host mode extcon intel-cht-wc: Enable external charger drivers/extcon/extcon-intel-cht-wc.c | 71 +++++++++++++++++++++++++++- 1 file changed, 70 insertions(+), 1 deletion(-) -- 2.20.1
