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authorLee Jones <lee.jones@linaro.org>2016-06-06 16:56:51 +0100
committerPhilipp Zabel <p.zabel@pengutronix.de>2016-06-29 21:24:52 +0200
commit40faee8ee471ae526344cd5c62ff520d356de841 (patch)
treec2158358a27a768b1fa6a0ff88949992936b14fb /include
parenta53e35db70d1638002e40d495d096181dbb0fe16 (diff)
downloadlinux-40faee8ee471ae526344cd5c62ff520d356de841.tar.gz
reset: Supply *_shared variant calls when using of_* API
Consumers need to be able to specify whether they are requesting an 'exclusive' or 'shared' reset line no matter which API (of_*, devm_*, etc) they are using. This change allows users of the of_* API in particular to specify that their request is for a 'shared' line. Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/reset.h53
1 files changed, 53 insertions, 0 deletions
diff --git a/include/linux/reset.h b/include/linux/reset.h
index 9cf4cf39bf1d..fd69240907c8 100644
--- a/include/linux/reset.h
+++ b/include/linux/reset.h
@@ -158,6 +158,31 @@ static inline struct reset_control *of_reset_control_get_exclusive(
}
/**
+ * of_reset_control_get_shared - Lookup and obtain an shared reference
+ * to a reset controller.
+ * @node: device to be reset by the controller
+ * @id: reset line name
+ *
+ * When a reset-control is shared, the behavior of reset_control_assert /
+ * deassert is changed, the reset-core will keep track of a deassert_count
+ * and only (re-)assert the reset after reset_control_assert has been called
+ * as many times as reset_control_deassert was called. Also see the remark
+ * about shared reset-controls in the reset_control_assert docs.
+ *
+ * Calling reset_control_assert without first calling reset_control_deassert
+ * is not allowed on a shared reset control. Calling reset_control_reset is
+ * also not allowed on a shared reset control.
+ * Returns a struct reset_control or IS_ERR() condition containing errno.
+ *
+ * Use of id names is optional.
+ */
+static inline struct reset_control *of_reset_control_get_shared(
+ struct device_node *node, const char *id)
+{
+ return __of_reset_control_get(node, id, 0, 1);
+}
+
+/**
* of_reset_control_get_exclusive_by_index - Lookup and obtain an exclusive
* reference to a reset controller
* by index.
@@ -175,6 +200,34 @@ static inline struct reset_control *of_reset_control_get_exclusive_by_index(
}
/**
+ * of_reset_control_get_shared_by_index - Lookup and obtain an shared
+ * reference to a reset controller
+ * by index.
+ * @node: device to be reset by the controller
+ * @index: index of the reset controller
+ *
+ * When a reset-control is shared, the behavior of reset_control_assert /
+ * deassert is changed, the reset-core will keep track of a deassert_count
+ * and only (re-)assert the reset after reset_control_assert has been called
+ * as many times as reset_control_deassert was called. Also see the remark
+ * about shared reset-controls in the reset_control_assert docs.
+ *
+ * Calling reset_control_assert without first calling reset_control_deassert
+ * is not allowed on a shared reset control. Calling reset_control_reset is
+ * also not allowed on a shared reset control.
+ * Returns a struct reset_control or IS_ERR() condition containing errno.
+ *
+ * This is to be used to perform a list of resets for a device or power domain
+ * in whatever order. Returns a struct reset_control or IS_ERR() condition
+ * containing errno.
+ */
+static inline struct reset_control *of_reset_control_get_shared_by_index(
+ struct device_node *node, int index)
+{
+ return __of_reset_control_get(node, NULL, index, 1);
+}
+
+/**
* devm_reset_control_get_exclusive - resource managed
* reset_control_get_exclusive()
* @dev: device to be reset by the controller