tree 800a2c3f9f27bd46c1d75478078b8f953cc243d8
parent b263b473bf62dfd4aa10fc9068b2c78b1b20f202
author Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> 1490813030 +0200
committer Eduardo Valentin <edubezval@gmail.com> 1490935149 -0700

thermal: rcar_gen3_thermal: add delay in .thermal_init on r8a7796

The .thermal_init needs to be delayed a short amount of time to allow
for the TEMP register to contain something useful. If it's not delayed
these warnings are common during boot:

thermal thermal_zone0: failed to read out thermal zone (-5)
thermal thermal_zone1: failed to read out thermal zone (-5)
thermal thermal_zone2: failed to read out thermal zone (-5)

The warnings are triggered by the first call to .get_temp() while the
TEMP register contains 0 and rcar_gen3_thermal_get_temp() returns -EIO
since a TEMP value of 0 will result in a temperature reading which is
out of specifications.

This should have been done in the initial commit which adds the driver
as the same issue was found and corrected for r8a7795.

Fixes: 564e73d283af9d4c ("thermal: rcar_gen3_thermal: Add R-Car Gen3 thermal driver")
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>