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Groups > linux.kernel > #1415252
| From | Lee Jones <lee.jones@linaro.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3/7] reset: Supply *_shared variant calls when using of_* API |
| Date | 2016-06-06 18:10 +0200 |
| Message-ID | <rH5gd-7ea-9@gated-at.bofh.it> (permalink) |
| References | <rH56x-6VJ-19@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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>
---
include/linux/reset.h | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/include/linux/reset.h b/include/linux/reset.h
index 9cf4cf3..fd69240 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
--
2.8.3
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[PATCH 0/7] reset: Consumers to explicitly request 'exclusive' or 'shared' lines Lee Jones <lee.jones@linaro.org> - 2016-06-06 18:00 +0200
[PATCH 6/7] phy: miphy28lp: Inform the reset framework that our reset line may be shared Lee Jones <lee.jones@linaro.org> - 2016-06-06 18:00 +0200
Re: [STLinux Kernel] [PATCH 6/7] phy: miphy28lp: Inform the reset framework that our reset line may be shared Peter Griffin <peter.griffin@linaro.org> - 2016-06-07 10:40 +0200
Re: [PATCH 6/7] phy: miphy28lp: Inform the reset framework that our reset line may be shared Kishon Vijay Abraham I <kishon@ti.com> - 2016-06-07 11:10 +0200
[PATCH 2/7] reset: Ensure drivers are explicit when requesting reset lines Lee Jones <lee.jones@linaro.org> - 2016-06-06 18:00 +0200
[PATCH 7/7] usb: dwc3: st: Inform the reset framework that our reset line may be shared Lee Jones <lee.jones@linaro.org> - 2016-06-06 18:00 +0200
[PATCH 9/10] usb: host: ehci-st: Inform the reset framework that our reset line may be shared Lee Jones <lee.jones@linaro.org> - 2016-06-06 19:20 +0200
Re: [PATCH 9/10] usb: host: ehci-st: Inform the reset framework that our reset line may be shared Alan Stern <stern@rowland.harvard.edu> - 2016-06-06 19:50 +0200
[PATCH 8/10] phy: phy-stih407-usb: Inform the reset framework that our reset line may be shared Lee Jones <lee.jones@linaro.org> - 2016-06-06 19:20 +0200
[PATCH 10/10] usb: host: ohci-st: Inform the reset framework that our reset line may be shared Lee Jones <lee.jones@linaro.org> - 2016-06-06 19:20 +0200
Re: [STLinux Kernel] [PATCH 8/10] phy: phy-stih407-usb: Inform the reset framework that our reset line may be shared Peter Griffin <peter.griffin@linaro.org> - 2016-06-07 10:40 +0200
Re: [PATCH 8/10] phy: phy-stih407-usb: Inform the reset framework that our reset line may be shared Kishon Vijay Abraham I <kishon@ti.com> - 2016-06-07 11:10 +0200
Re: [STLinux Kernel] [PATCH 7/7] usb: dwc3: st: Inform the reset framework that our reset line may be shared Peter Griffin <peter.griffin@linaro.org> - 2016-06-07 10:50 +0200
[PATCH 5/7] reset: TRIVIAL: Add line break at same place for similar APIs Lee Jones <lee.jones@linaro.org> - 2016-06-06 18:00 +0200
[PATCH 1/7] reset: Reorder inline reset_control_get*() wrappers Lee Jones <lee.jones@linaro.org> - 2016-06-06 18:10 +0200
[PATCH 3/7] reset: Supply *_shared variant calls when using of_* API Lee Jones <lee.jones@linaro.org> - 2016-06-06 18:10 +0200
[PATCH 4/7] reset: Supply *_shared variant calls when using *_optional APIs Lee Jones <lee.jones@linaro.org> - 2016-06-06 18:10 +0200
Re: [STLinux Kernel] [PATCH 0/7] reset: Consumers to explicitly request 'exclusive' or 'shared' lines Peter Griffin <peter.griffin@linaro.org> - 2016-06-07 10:50 +0200
Re: [STLinux Kernel] [PATCH 0/7] reset: Consumers to explicitly request 'exclusive' or 'shared' lines Lee Jones <lee.jones@linaro.org> - 2016-06-07 11:20 +0200
Re: [STLinux Kernel] [PATCH 0/7] reset: Consumers to explicitly request 'exclusive' or 'shared' lines Lee Jones <lee.jones@linaro.org> - 2016-06-07 11:30 +0200
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