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112 lines
3.4 KiB
112 lines
3.4 KiB
From 0325b48d6149e131c90ed6ec77458f4d2df73898 Mon Sep 17 00:00:00 2001
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From: Maxime Ripard <maxime.ripard@free-electrons.com>
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Date: Fri, 20 Dec 2013 22:41:07 +0100
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Subject: [PATCH] reset: Add of_reset_control_get
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In some cases, you might need to deassert from reset an hardware block that
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doesn't associated to a struct device (CPUs, timers, etc.).
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Add a small helper to retrieve the reset controller from the device tree
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without the need to pass a struct device.
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Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
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---
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drivers/reset/core.c | 39 ++++++++++++++++++++++++++++++---------
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include/linux/reset.h | 4 ++++
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2 files changed, 34 insertions(+), 9 deletions(-)
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--- a/drivers/reset/core.c
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+++ b/drivers/reset/core.c
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@@ -127,15 +127,16 @@ int reset_control_deassert(struct reset_
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EXPORT_SYMBOL_GPL(reset_control_deassert);
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/**
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- * reset_control_get - Lookup and obtain a reference to a reset controller.
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- * @dev: device to be reset by the controller
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+ * of_reset_control_get - Lookup and obtain a reference to a reset controller.
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+ * @node: device to be reset by the controller
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* @id: reset line name
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*
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* Returns a struct reset_control or IS_ERR() condition containing errno.
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*
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* Use of id names is optional.
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*/
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-struct reset_control *reset_control_get(struct device *dev, const char *id)
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+struct reset_control *of_reset_control_get(struct device_node *node,
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+ const char *id)
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{
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struct reset_control *rstc = ERR_PTR(-EPROBE_DEFER);
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struct reset_controller_dev *r, *rcdev;
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@@ -144,13 +145,10 @@ struct reset_control *reset_control_get(
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int rstc_id;
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int ret;
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- if (!dev)
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- return ERR_PTR(-EINVAL);
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-
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if (id)
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- index = of_property_match_string(dev->of_node,
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+ index = of_property_match_string(node,
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"reset-names", id);
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- ret = of_parse_phandle_with_args(dev->of_node, "resets", "#reset-cells",
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+ ret = of_parse_phandle_with_args(node, "resets", "#reset-cells",
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index, &args);
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if (ret)
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return ERR_PTR(ret);
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@@ -185,12 +183,35 @@ struct reset_control *reset_control_get(
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return ERR_PTR(-ENOMEM);
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}
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- rstc->dev = dev;
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rstc->rcdev = rcdev;
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rstc->id = rstc_id;
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return rstc;
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}
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+EXPORT_SYMBOL_GPL(of_reset_control_get);
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+
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+/**
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+ * reset_control_get - Lookup and obtain a reference to a reset controller.
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+ * @dev: device to be reset by the controller
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+ * @id: reset line name
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+ *
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+ * Returns a struct reset_control or IS_ERR() condition containing errno.
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+ *
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+ * Use of id names is optional.
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+ */
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+struct reset_control *reset_control_get(struct device *dev, const char *id)
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+{
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+ struct reset_control *rstc;
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+
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+ if (!dev)
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+ return ERR_PTR(-EINVAL);
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+
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+ rstc = of_reset_control_get(dev->of_node, id);
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+ if (!IS_ERR(rstc))
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+ rstc->dev = dev;
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+
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+ return rstc;
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+}
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EXPORT_SYMBOL_GPL(reset_control_get);
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/**
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--- a/include/linux/reset.h
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+++ b/include/linux/reset.h
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@@ -1,6 +1,8 @@
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#ifndef _LINUX_RESET_H_
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#define _LINUX_RESET_H_
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+#include <linux/of.h>
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+
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struct device;
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struct reset_control;
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@@ -8,6 +10,8 @@ int reset_control_reset(struct reset_con
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int reset_control_assert(struct reset_control *rstc);
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int reset_control_deassert(struct reset_control *rstc);
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+struct reset_control *of_reset_control_get(struct device_node *node,
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+ const char *id);
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struct reset_control *reset_control_get(struct device *dev, const char *id);
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void reset_control_put(struct reset_control *rstc);
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struct reset_control *devm_reset_control_get(struct device *dev, const char *id);
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