hwmon: (pmbus) Introduce and use cached vout margins

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When setting a new voltage the voltage boundaries are read every time to
check that the new voltage is within the proper range. Checking these
voltage boundaries consists of reading one of PMBUS_MFR_VOUT_MIN/
PMBUS_VOUT_MARGIN_LOW registers and then PMBUS_MFR_VOUT_MAX/
PMBUS_VOUT_MARGIN_HIGH together with writing the PMBUS_CLEAR_FAULTS
register.

Since these boundaries are never being changed, it can be cached and
thus saving unnecessary smbus transmissions.

Signed-off-by: Mårten Lindahl <marten.lindahl@axis.com>
Link: https://lore.kernel.org/r/20220614093856.3470672-2-marten.lindahl@axis.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

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Mårten Lindahl 2022-06-14 11:38:54 +02:00 • committed by Guenter Roeck

parent b674bcb13f

commit 07fb76273d

1 changed files with 61 additions and 17 deletions

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drivers/hwmon/pmbus/pmbus_core.c

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