[PATCH v2] pinctrl: clarify idle vs sleep states
linus.walleij at stericsson.com
Fri Sep 28 03:18:08 EDT 2012
From: Linus Walleij <linus.walleij at linaro.org>
This pure documentation fix tries to align the "idle" and
"sleep" pin states to the idle and suspend states from
Cc: Patrice Chotard <patrice.chotard at st.com>
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
- I changed my mind slightly after experimentation in practice
(empirical stuff is the best). So now I think "idle" is for
runtime_suspend(), and "sleep" is for suspend() proper. This
works best in practice for us. I'm trying to set some model
here that will be easy to understand and usable for typical
include/linux/pinctrl/pinctrl-state.h | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/include/linux/pinctrl/pinctrl-state.h b/include/linux/pinctrl/pinctrl-state.h
index 634608dc..b5919f8 100644
@@ -6,13 +6,18 @@
* @PINCTRL_STATE_DEFAULT: the state the pinctrl handle shall be put
* into as default, usually this means the pins are up and ready to
* be used by the device driver. This state is commonly used by
- * hogs to configure muxing and pins at boot.
+ * hogs to configure muxing and pins at boot, and also as a state
+ * to go into when returning from sleep and idle in
+ * .pm_runtime_resume() or ordinary .resume() for example.
* @PINCTRL_STATE_IDLE: the state the pinctrl handle shall be put into
- * when the pins are idle. Could typically be set from a
- * pm_runtime_suspend() operation.
+ * when the pins are idle. This is a state where the system is relaxed
+ * but not fully sleeping - some power may be on but clocks gated for
+ * example. Could typically be set from a pm_runtime_suspend() or
+ * pm_runtime_idle() operation.
* @PINCTRL_STATE_SLEEP: the state the pinctrl handle shall be put into
- * when the pins are sleeping. Could typically be set from a
- * common suspend() function.
+ * when the pins are sleeping. This is a state where the system is in
+ * its lowest sleep state. Could typically be set from an
+ * ordinary .suspend() function.
#define PINCTRL_STATE_DEFAULT "default"
#define PINCTRL_STATE_IDLE "idle"
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