drivers: pinctrl sleep and idle states in the core
If a device have sleep and idle states in addition to the
default state, look up these in the core and stash them in
the pinctrl state container.
Add accessor functions for pinctrl consumers to put the pins
into "default", "sleep" and "idle" states passing nothing but
the struct device * affected.
Solution suggested by Kevin Hilman, Mark Brown and Dmitry
Torokhov in response to a patch series from Hebbar
Gururaja.
Cc: Hebbar Gururaja <gururaja.hebbar@ti.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/base/pinctrl.c b/drivers/base/pinctrl.c
index 67a274e..5fb74b4 100644
--- a/drivers/base/pinctrl.c
+++ b/drivers/base/pinctrl.c
@@ -48,6 +48,25 @@
goto cleanup_get;
}
+#ifdef CONFIG_PM
+ /*
+ * If power management is enabled, we also look for the optional
+ * sleep and idle pin states, with semantics as defined in
+ * <linux/pinctrl/pinctrl-state.h>
+ */
+ dev->pins->sleep_state = pinctrl_lookup_state(dev->pins->p,
+ PINCTRL_STATE_SLEEP);
+ if (IS_ERR(dev->pins->sleep_state))
+ /* Not supplying this state is perfectly legal */
+ dev_dbg(dev, "no sleep pinctrl state\n");
+
+ dev->pins->idle_state = pinctrl_lookup_state(dev->pins->p,
+ PINCTRL_STATE_IDLE);
+ if (IS_ERR(dev->pins->idle_state))
+ /* Not supplying this state is perfectly legal */
+ dev_dbg(dev, "no idle pinctrl state\n");
+#endif
+
return 0;
/*
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 1f9608b..dca9208 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -1196,6 +1196,67 @@
}
EXPORT_SYMBOL_GPL(pinctrl_force_default);
+#ifdef CONFIG_PM
+
+/**
+ * pinctrl_pm_select_default_state() - select default pinctrl state for PM
+ * @dev: device to select default state for
+ */
+int pinctrl_pm_select_default_state(struct device *dev)
+{
+ struct dev_pin_info *pins = dev->pins;
+ int ret;
+
+ if (!pins)
+ return 0;
+ if (IS_ERR(pins->default_state))
+ return 0; /* No default state */
+ ret = pinctrl_select_state(pins->p, pins->default_state);
+ if (ret)
+ dev_err(dev, "failed to activate default pinctrl state\n");
+ return ret;
+}
+
+/**
+ * pinctrl_pm_select_sleep_state() - select sleep pinctrl state for PM
+ * @dev: device to select sleep state for
+ */
+int pinctrl_pm_select_sleep_state(struct device *dev)
+{
+ struct dev_pin_info *pins = dev->pins;
+ int ret;
+
+ if (!pins)
+ return 0;
+ if (IS_ERR(pins->sleep_state))
+ return 0; /* No sleep state */
+ ret = pinctrl_select_state(pins->p, pins->sleep_state);
+ if (ret)
+ dev_err(dev, "failed to activate pinctrl sleep state\n");
+ return ret;
+}
+
+/**
+ * pinctrl_pm_select_idle_state() - select idle pinctrl state for PM
+ * @dev: device to select idle state for
+ */
+int pinctrl_pm_select_idle_state(struct device *dev)
+{
+ struct dev_pin_info *pins = dev->pins;
+ int ret;
+
+ if (!pins)
+ return 0;
+ if (IS_ERR(pins->idle_state))
+ return 0; /* No idle state */
+ ret = pinctrl_select_state(pins->p, pins->idle_state);
+ if (ret)
+ dev_err(dev, "failed to activate pinctrl idle state\n");
+ return ret;
+}
+
+#endif
+
#ifdef CONFIG_DEBUG_FS
static int pinctrl_pins_show(struct seq_file *s, void *what)