regulator: Fix qcom-smd list voltage issues for msm8974

This commit looks like a cleanup but in fact by causing the core to go
down some simplified code paths for noop regulators it avoids a boot
time crash for msm8974 platforms which was introduced in v4.7.  It has
been in -next for a while, the issues in mainline for these platforms
weren't flagged up to me until yesterday (I think it took some time to
figure out what was going wrong).
regulator: qcom_smd: Remove list_voltage callback for rpm_smps_ldo_ops_fixed

Use regulator_list_voltage_linear_range in rpm_smps_ldo_ops_fixed is
wrong because it is used for fixed regulator without any linear range.
The rpm_smps_ldo_ops_fixed is used for pm8941_lnldo which has fixed_uV
set and n_voltages = 1. In this case, regulator_list_voltage() can return
rdev->desc->fixed_uV without .list_voltage implementation.

Fixes: 3bfbb4d1a480 ("regulator: qcom_smd: add list_voltage callback")
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
1 file changed