linux-kernel - [PATCH 0/2] extcon: Intel Cherry Trail Whiskey Cove PMIC and external charger tweaks

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Message-Id: <20190210203649.21691-1-jekhor@gmail.com>
Date:   Sun, 10 Feb 2019 23:36:47 +0300
From:   Yauhen Kharuzhy <jekhor@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Yauhen Kharuzhy <jekhor@...il.com>
Subject: [PATCH 0/2] extcon: Intel Cherry Trail Whiskey Cove PMIC and external charger tweaks

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