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regulator: pwm-regulator: Add validity checks in continuous .get_voltage 

[ Upstream commit c92688cac239794e4a1d976afa5203a4d3a2ac0e ]

Continuous regulators can be configured to operate only in a certain
duty cycle range (for example from 0..91%). Add a check to error out if
the duty cycle translates to an unsupported (or out of range) voltage.

Suggested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://msgid.link/r/20240113224628.377993-2-martin.blumenstingl@googlemail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Martin Blumenstingl 2024-01-13 23:46:26 +01:00 committed by Greg Kroah-Hartman
parent 9d508c8971
commit 13c1af5f3b
1 changed files with 3 additions and 0 deletions
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3
drivers/regulator/pwm-regulator.c
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@ -158,6 +158,9 @@ static int pwm_regulator_get_voltage(struct regulator_dev *rdev)
pwm_get_state(drvdata->pwm, &pstate);
voltage = pwm_get_relative_duty_cycle(&pstate, duty_unit);
if (voltage < min(max_uV_duty, min_uV_duty) ||
voltage > max(max_uV_duty, min_uV_duty))
return -ENOTRECOVERABLE;
/*
* The dutycycle for min_uV might be greater than the one for max_uV.