[PATCH v4 0/2] sy7636a: power the panel only during updates

[Pablo Mazzini <pmazzini@gmail.com>]

The SY7636A hwmon driver keeps VCOM on from probe, so a display driver
can not power the panel only during updates.

Read the temperature only while the rails are on instead.

This is based on regulator for-7.5, which has the rest of the series.
Patch 1 depends on "regulator: sy7636a: bind to the I2C device directly"
there.

Tested on a PocketBook Verse (B288).

v4:
- drop the patches applied by Mark and Guenter
- patch 1: keep the hwmon name (Guenter)

v3:
- drop the applied patches 1-3
- new patch: no wait when power good is already high (Mark)
- move the I2C binding before the hwmon read change, so the hwmon driver
  only probes once vin is on (Andreas)
- explain in a comment why power good gates the read, and its
  limitation (Guenter, Andreas)

v2:
- drop the DT patch keeping VCOM always-on (Andreas)
- only wait for power good, VCOM_EN stays as it was (Andreas)
- new patch: fix negative temperatures
- keep the temperature in drivers/hwmon as an auxiliary driver of the
  regulator, instead of moving it into the regulator driver (Guenter,
  Andreas)
- no VCOM enable at probe, which also removes the probe race
- read power good and the temperature in one transfer (Andreas)

Pablo Mazzini (2):
  hwmon: sy7636a: read the temperature only while the rails are on
  ARM: imx_v6_v7_defconfig: drop the SY7636A MFD option

 arch/arm/configs/imx_v6_v7_defconfig |  1 -
 drivers/hwmon/sy7636a-hwmon.c        | 35 +++++++++++++++++++---------
 2 files changed, 24 insertions(+), 12 deletions(-)


base-commit: 89b552ff49551960b9e270feee888a0298a12d94
-- 
2.52.0