Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index 9ab3db8..0f2e3fc 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -1,12 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* drivers/clk/clkdev.c
*
* Copyright (C) 2008 Russell King.
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
* Helper for the clk API to assist looking up a struct clk.
*/
#include <linux/module.h>
@@ -27,99 +24,6 @@
static LIST_HEAD(clocks);
static DEFINE_MUTEX(clocks_mutex);
-#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
-static struct clk *__of_clk_get(struct device_node *np, int index,
- const char *dev_id, const char *con_id)
-{
- struct of_phandle_args clkspec;
- struct clk *clk;
- int rc;
-
- rc = of_parse_phandle_with_args(np, "clocks", "#clock-cells", index,
- &clkspec);
- if (rc)
- return ERR_PTR(rc);
-
- clk = __of_clk_get_from_provider(&clkspec, dev_id, con_id);
- of_node_put(clkspec.np);
-
- return clk;
-}
-
-struct clk *of_clk_get(struct device_node *np, int index)
-{
- return __of_clk_get(np, index, np->full_name, NULL);
-}
-EXPORT_SYMBOL(of_clk_get);
-
-static struct clk *__of_clk_get_by_name(struct device_node *np,
- const char *dev_id,
- const char *name)
-{
- struct clk *clk = ERR_PTR(-ENOENT);
-
- /* Walk up the tree of devices looking for a clock that matches */
- while (np) {
- int index = 0;
-
- /*
- * For named clocks, first look up the name in the
- * "clock-names" property. If it cannot be found, then
- * index will be an error code, and of_clk_get() will fail.
- */
- if (name)
- index = of_property_match_string(np, "clock-names", name);
- clk = __of_clk_get(np, index, dev_id, name);
- if (!IS_ERR(clk)) {
- break;
- } else if (name && index >= 0) {
- if (PTR_ERR(clk) != -EPROBE_DEFER)
- pr_err("ERROR: could not get clock %pOF:%s(%i)\n",
- np, name ? name : "", index);
- return clk;
- }
-
- /*
- * No matching clock found on this node. If the parent node
- * has a "clock-ranges" property, then we can try one of its
- * clocks.
- */
- np = np->parent;
- if (np && !of_get_property(np, "clock-ranges", NULL))
- break;
- }
-
- return clk;
-}
-
-/**
- * of_clk_get_by_name() - Parse and lookup a clock referenced by a device node
- * @np: pointer to clock consumer node
- * @name: name of consumer's clock input, or NULL for the first clock reference
- *
- * This function parses the clocks and clock-names properties,
- * and uses them to look up the struct clk from the registered list of clock
- * providers.
- */
-struct clk *of_clk_get_by_name(struct device_node *np, const char *name)
-{
- if (!np)
- return ERR_PTR(-ENOENT);
-
- return __of_clk_get_by_name(np, np->full_name, name);
-}
-EXPORT_SYMBOL(of_clk_get_by_name);
-
-#else /* defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) */
-
-static struct clk *__of_clk_get_by_name(struct device_node *np,
- const char *dev_id,
- const char *name)
-{
- return ERR_PTR(-ENOENT);
-}
-#endif
-
/*
* Find the correct struct clk for the device and connection ID.
* We do slightly fuzzy matching here:
@@ -139,6 +43,8 @@
if (con_id)
best_possible += 1;
+ lockdep_assert_held(&clocks_mutex);
+
list_for_each_entry(p, &clocks, node) {
match = 0;
if (p->dev_id) {
@@ -163,46 +69,46 @@
return cl;
}
-struct clk *clk_get_sys(const char *dev_id, const char *con_id)
+struct clk_hw *clk_find_hw(const char *dev_id, const char *con_id)
{
struct clk_lookup *cl;
- struct clk *clk = NULL;
+ struct clk_hw *hw = ERR_PTR(-ENOENT);
mutex_lock(&clocks_mutex);
-
cl = clk_find(dev_id, con_id);
- if (!cl)
- goto out;
-
- clk = __clk_create_clk(cl->clk_hw, dev_id, con_id);
- if (IS_ERR(clk))
- goto out;
-
- if (!__clk_get(clk)) {
- __clk_free_clk(clk);
- cl = NULL;
- goto out;
- }
-
-out:
+ if (cl)
+ hw = cl->clk_hw;
mutex_unlock(&clocks_mutex);
- return cl ? clk : ERR_PTR(-ENOENT);
+ return hw;
+}
+
+static struct clk *__clk_get_sys(struct device *dev, const char *dev_id,
+ const char *con_id)
+{
+ struct clk_hw *hw = clk_find_hw(dev_id, con_id);
+
+ return clk_hw_create_clk(dev, hw, dev_id, con_id);
+}
+
+struct clk *clk_get_sys(const char *dev_id, const char *con_id)
+{
+ return __clk_get_sys(NULL, dev_id, con_id);
}
EXPORT_SYMBOL(clk_get_sys);
struct clk *clk_get(struct device *dev, const char *con_id)
{
const char *dev_id = dev ? dev_name(dev) : NULL;
- struct clk *clk;
+ struct clk_hw *hw;
if (dev && dev->of_node) {
- clk = __of_clk_get_by_name(dev->of_node, dev_id, con_id);
- if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
- return clk;
+ hw = of_clk_get_hw(dev->of_node, 0, con_id);
+ if (!IS_ERR(hw) || PTR_ERR(hw) == -EPROBE_DEFER)
+ return clk_hw_create_clk(dev, hw, dev_id, con_id);
}
- return clk_get_sys(dev_id, con_id);
+ return __clk_get_sys(dev, dev_id, con_id);
}
EXPORT_SYMBOL(clk_get);
@@ -401,6 +307,23 @@
return cl;
}
+static int do_clk_register_clkdev(struct clk_hw *hw,
+ struct clk_lookup **cl, const char *con_id, const char *dev_id)
+{
+ if (IS_ERR(hw))
+ return PTR_ERR(hw);
+ /*
+ * Since dev_id can be NULL, and NULL is handled specially, we must
+ * pass it as either a NULL format string, or with "%s".
+ */
+ if (dev_id)
+ *cl = __clk_register_clkdev(hw, con_id, "%s", dev_id);
+ else
+ *cl = __clk_register_clkdev(hw, con_id, NULL);
+
+ return *cl ? 0 : -ENOMEM;
+}
+
/**
* clk_register_clkdev - register one clock lookup for a struct clk
* @clk: struct clk to associate with all clk_lookups
@@ -423,17 +346,8 @@
if (IS_ERR(clk))
return PTR_ERR(clk);
- /*
- * Since dev_id can be NULL, and NULL is handled specially, we must
- * pass it as either a NULL format string, or with "%s".
- */
- if (dev_id)
- cl = __clk_register_clkdev(__clk_get_hw(clk), con_id, "%s",
- dev_id);
- else
- cl = __clk_register_clkdev(__clk_get_hw(clk), con_id, NULL);
-
- return cl ? 0 : -ENOMEM;
+ return do_clk_register_clkdev(__clk_get_hw(clk), &cl, con_id,
+ dev_id);
}
EXPORT_SYMBOL(clk_register_clkdev);
@@ -456,18 +370,78 @@
{
struct clk_lookup *cl;
- if (IS_ERR(hw))
- return PTR_ERR(hw);
-
- /*
- * Since dev_id can be NULL, and NULL is handled specially, we must
- * pass it as either a NULL format string, or with "%s".
- */
- if (dev_id)
- cl = __clk_register_clkdev(hw, con_id, "%s", dev_id);
- else
- cl = __clk_register_clkdev(hw, con_id, NULL);
-
- return cl ? 0 : -ENOMEM;
+ return do_clk_register_clkdev(hw, &cl, con_id, dev_id);
}
EXPORT_SYMBOL(clk_hw_register_clkdev);
+
+static void devm_clkdev_release(struct device *dev, void *res)
+{
+ clkdev_drop(*(struct clk_lookup **)res);
+}
+
+static int devm_clk_match_clkdev(struct device *dev, void *res, void *data)
+{
+ struct clk_lookup **l = res;
+
+ return *l == data;
+}
+
+/**
+ * devm_clk_release_clkdev - Resource managed clkdev lookup release
+ * @dev: device this lookup is bound
+ * @con_id: connection ID string on device
+ * @dev_id: format string describing device name
+ *
+ * Drop the clkdev lookup created with devm_clk_hw_register_clkdev.
+ * Normally this function will not need to be called and the resource
+ * management code will ensure that the resource is freed.
+ */
+void devm_clk_release_clkdev(struct device *dev, const char *con_id,
+ const char *dev_id)
+{
+ struct clk_lookup *cl;
+ int rval;
+
+ mutex_lock(&clocks_mutex);
+ cl = clk_find(dev_id, con_id);
+ mutex_unlock(&clocks_mutex);
+
+ WARN_ON(!cl);
+ rval = devres_release(dev, devm_clkdev_release,
+ devm_clk_match_clkdev, cl);
+ WARN_ON(rval);
+}
+EXPORT_SYMBOL(devm_clk_release_clkdev);
+
+/**
+ * devm_clk_hw_register_clkdev - managed clk lookup registration for clk_hw
+ * @dev: device this lookup is bound
+ * @hw: struct clk_hw to associate with all clk_lookups
+ * @con_id: connection ID string on device
+ * @dev_id: format string describing device name
+ *
+ * con_id or dev_id may be NULL as a wildcard, just as in the rest of
+ * clkdev.
+ *
+ * To make things easier for mass registration, we detect error clk_hws
+ * from a previous clk_hw_register_*() call, and return the error code for
+ * those. This is to permit this function to be called immediately
+ * after clk_hw_register_*().
+ */
+int devm_clk_hw_register_clkdev(struct device *dev, struct clk_hw *hw,
+ const char *con_id, const char *dev_id)
+{
+ int rval = -ENOMEM;
+ struct clk_lookup **cl;
+
+ cl = devres_alloc(devm_clkdev_release, sizeof(*cl), GFP_KERNEL);
+ if (cl) {
+ rval = do_clk_register_clkdev(hw, cl, con_id, dev_id);
+ if (!rval)
+ devres_add(dev, cl);
+ else
+ devres_free(cl);
+ }
+ return rval;
+}
+EXPORT_SYMBOL(devm_clk_hw_register_clkdev);