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SubjectApplied "regulator: core: avoid unneeded .list_voltage calls" to the regulator tree
The patch

regulator: core: avoid unneeded .list_voltage calls

has been applied to the regulator tree at for-5.5

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

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From 6d30fc511bec82dd8801b9bb8718cbeea1366ad8 Mon Sep 17 00:00:00 2001
From: Cristian Marussi <>
Date: Mon, 9 Dec 2019 12:52:39 +0000
Subject: [PATCH] regulator: core: avoid unneeded .list_voltage calls

Inside machine_constraints_voltage() a loop is in charge of verifying that
each of the defined voltages are within the configured constraints and
that those constraints are in fact compatible with the available voltages'

When the registered regulator happens to be defined with a wide range of
possible voltages the above O(n) loop can be costly.
Moreover since this behaviour is triggered during the registration process,
it means also that it can be easily triggered at probe time, slowing down
considerably some module loading.

On the other side if such wide range of voltage values happens to be also
continuous and without discontinuity of any kind, the above potentially
cumbersome operation is also useless.

For these reasons, avoid such .list_voltage poll loop when regulator is
described as 'continuous_voltage_range' as is, indeed, similarly already
done inside regulator_is_supported_voltage().

Signed-off-by: Cristian Marussi <>
Signed-off-by: Mark Brown <>
drivers/regulator/core.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 2c3a03cfd381..2961ac08d1ae 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1198,6 +1198,10 @@ static int machine_constraints_voltage(struct regulator_dev *rdev,
return -EINVAL;

+ /* no need to loop voltages if range is continuous */
+ if (rdev->desc->continuous_voltage_range)
+ return 0;
/* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
for (i = 0; i < count; i++) {
int value;
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