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>

1 files changed, 61 insertions, 0 deletions

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 1f9608bd237e..dca9208f5463 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -1196,6 +1196,67 @@ int pinctrl_force_default(struct pinctrl_dev *pctldev)
 }
 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)