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clk: Allow clocks to be marked as CRITICAL

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Critical clocks are those which must not be gated, else undefined
or catastrophic failure would occur.  Here we have chosen to
ensure the prepare/enable counts are correctly incremented, so as
not to confuse users with enabled clocks with no visible users.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/1455225554-13267-2-git-send-email-mturquette@baylibre.com
This commit is contained in:
Lee Jones 2016-02-11 13:19:09 -08:00 committed by Michael Turquette
parent c0553d04f8
commit 32b9b10961
2 changed files with 6 additions and 0 deletions
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5
drivers/clk/clk.c
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@ -2397,6 +2397,11 @@ static int __clk_core_init(struct clk_core *core)
if (core->ops->init)
core->ops->init(core->hw);
if (core->flags & CLK_IS_CRITICAL) {
clk_core_prepare(core);
clk_core_enable(core);
}
kref_init(&core->ref);
out:
clk_prepare_unlock();

1
include/linux/clk-provider.h
View File

@ -32,6 +32,7 @@
#define CLK_GET_ACCURACY_NOCACHE BIT(8) /* do not use the cached clk accuracy */
#define CLK_RECALC_NEW_RATES BIT(9) /* recalc rates after notifications */
#define CLK_SET_RATE_UNGATE BIT(10) /* clock needs to run to set rate */
#define CLK_IS_CRITICAL BIT(11) /* do not gate, ever */
struct clk;
struct clk_hw;