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regulator: core: Add option to prevent disabling unused regulators

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This may be useful for debugging and develompent purposes, when there are
drivers that depend on regulators to be enabled but do not request them.

It is inspired from the clk_ignore_unused and pd_ignore_unused parameters,
that are used to keep firmware-enabled clocks and power domains on even if
these are not used by drivers.

The parameter is not expected to be used in normal cases and should not be
needed on a platform with proper driver support.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Brian Masney <bmasney@redhat.com>
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20231107190926.1185326-1-javierm@redhat.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Javier Martinez Canillas 2023-11-07 20:09:18 +01:00 committed by Mark Brown
parent b85ea95d08
commit c986968fe9
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7
Documentation/admin-guide/kernel-parameters.txt
View file

@ -5544,6 +5544,13 @@
print every Nth verbose statement, where N is the value
specified.
regulator_ignore_unused
[REGULATOR]
Prevents regulator framework from disabling regulators
that are unused, due no driver claiming them. This may
be useful for debug and development, but should not be
needed on a platform with proper driver support.
relax_domain_level=
[KNL, SMP] Set scheduler's default relax_domain_level.
See Documentation/admin-guide/cgroup-v1/cpusets.rst.

17
drivers/regulator/core.c
View file

@ -6234,6 +6234,14 @@ static int regulator_late_cleanup(struct device *dev, void *data)
return 0;
}
static bool regulator_ignore_unused;
static int __init regulator_ignore_unused_setup(char *__unused)
{
regulator_ignore_unused = true;
return 1;
}
__setup("regulator_ignore_unused", regulator_ignore_unused_setup);
static void regulator_init_complete_work_function(struct work_struct *work)
{
/*
@ -6246,6 +6254,15 @@ static void regulator_init_complete_work_function(struct work_struct *work)
class_for_each_device(&regulator_class, NULL, NULL,
regulator_register_resolve_supply);
/*
* For debugging purposes, it may be useful to prevent unused
* regulators from being disabled.
*/
if (regulator_ignore_unused) {
pr_warn("regulator: Not disabling unused regulators\n");
return;
}
/* If we have a full configuration then disable any regulators
* we have permission to change the status for and which are
* not in use or always_on. This is effectively the default