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clk: Allow clocks to be marked as CRITICAL 

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
View File

@ -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;