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reset: Supply *_shared variant calls when using of_* API

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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>
This commit is contained in:
Lee Jones 2016-06-06 16:56:51 +01:00 committed by Philipp Zabel
parent a53e35db70
commit 40faee8ee4
1 changed files with 53 additions and 0 deletions
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53
include/linux/reset.h
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@ -157,6 +157,31 @@ static inline struct reset_control *of_reset_control_get_exclusive(
return __of_reset_control_get(node, id, 0, 0);
}
/**
* 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
@ -174,6 +199,34 @@ static inline struct reset_control *of_reset_control_get_exclusive_by_index(
return __of_reset_control_get(node, NULL, index, 0);
}
/**
* 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()