reset: Add devm_reset_control_get_optional_exclusive_released()

NVIDIA Tegra DRM and media drivers will need a resource-managed-optional
variant of reset_control_get_exclusive_released() in order to switch away
from a legacy Tegra-specific PD API to a GENPD API without much hassle.
Add the new reset helper to the reset API.

Tested-by: Peter Geis <pgwipeout@gmail.com> # Ouya T30
Tested-by: Nicolas Chauvet <kwizart@gmail.com> # PAZ00 T20
Tested-by: Matt Merhar <mattmerhar@protonmail.com> # Ouya T30
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

diff --git a/include/linux/reset.h b/include/linux/reset.h
index 439fec7112a95424a3f1962fe879011fd8ed896e..b9109efa2a5cd866fc22ab1e206114c3f2baee1e 100644 (file)
--- a/include/linux/reset.h
+++ b/include/linux/reset.h
@@ -362,6 +362,25 @@ __must_check devm_reset_control_get_exclusive_released(struct device *dev,
        return __devm_reset_control_get(dev, id, 0, false, false, false);
 }
 
+/**
+ * devm_reset_control_get_optional_exclusive_released - resource managed
+ *                                                      reset_control_get_optional_exclusive_released()
+ * @dev: device to be reset by the controller
+ * @id: reset line name
+ *
+ * Managed-and-optional variant of reset_control_get_exclusive_released(). For
+ * reset controllers returned from this function, reset_control_put() is called
+ * automatically on driver detach.
+ *
+ * See reset_control_get_exclusive_released() for more information.
+ */
+static inline struct reset_control *
+__must_check devm_reset_control_get_optional_exclusive_released(struct device *dev,
+                                                               const char *id)
+{
+       return __devm_reset_control_get(dev, id, 0, false, true, false);
+}
+
 /**
  * devm_reset_control_get_shared - resource managed reset_control_get_shared()
  * @dev: device to be reset by the controller