v4.19.13 snapshot.
diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
new file mode 100644
index 0000000..9ab3db8
--- /dev/null
+++ b/drivers/clk/clkdev.c
@@ -0,0 +1,473 @@
+/*
+ * 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>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/mutex.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/of.h>
+
+#include "clk.h"
+
+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:
+ * An entry with a NULL ID is assumed to be a wildcard.
+ * If an entry has a device ID, it must match
+ * If an entry has a connection ID, it must match
+ * Then we take the most specific entry - with the following
+ * order of precedence: dev+con > dev only > con only.
+ */
+static struct clk_lookup *clk_find(const char *dev_id, const char *con_id)
+{
+ struct clk_lookup *p, *cl = NULL;
+ int match, best_found = 0, best_possible = 0;
+
+ if (dev_id)
+ best_possible += 2;
+ if (con_id)
+ best_possible += 1;
+
+ list_for_each_entry(p, &clocks, node) {
+ match = 0;
+ if (p->dev_id) {
+ if (!dev_id || strcmp(p->dev_id, dev_id))
+ continue;
+ match += 2;
+ }
+ if (p->con_id) {
+ if (!con_id || strcmp(p->con_id, con_id))
+ continue;
+ match += 1;
+ }
+
+ if (match > best_found) {
+ cl = p;
+ if (match != best_possible)
+ best_found = match;
+ else
+ break;
+ }
+ }
+ return cl;
+}
+
+struct clk *clk_get_sys(const char *dev_id, const char *con_id)
+{
+ struct clk_lookup *cl;
+ struct clk *clk = NULL;
+
+ 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:
+ mutex_unlock(&clocks_mutex);
+
+ return cl ? clk : ERR_PTR(-ENOENT);
+}
+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;
+
+ 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;
+ }
+
+ return clk_get_sys(dev_id, con_id);
+}
+EXPORT_SYMBOL(clk_get);
+
+void clk_put(struct clk *clk)
+{
+ __clk_put(clk);
+}
+EXPORT_SYMBOL(clk_put);
+
+static void __clkdev_add(struct clk_lookup *cl)
+{
+ mutex_lock(&clocks_mutex);
+ list_add_tail(&cl->node, &clocks);
+ mutex_unlock(&clocks_mutex);
+}
+
+void clkdev_add(struct clk_lookup *cl)
+{
+ if (!cl->clk_hw)
+ cl->clk_hw = __clk_get_hw(cl->clk);
+ __clkdev_add(cl);
+}
+EXPORT_SYMBOL(clkdev_add);
+
+void clkdev_add_table(struct clk_lookup *cl, size_t num)
+{
+ mutex_lock(&clocks_mutex);
+ while (num--) {
+ cl->clk_hw = __clk_get_hw(cl->clk);
+ list_add_tail(&cl->node, &clocks);
+ cl++;
+ }
+ mutex_unlock(&clocks_mutex);
+}
+
+#define MAX_DEV_ID 20
+#define MAX_CON_ID 16
+
+struct clk_lookup_alloc {
+ struct clk_lookup cl;
+ char dev_id[MAX_DEV_ID];
+ char con_id[MAX_CON_ID];
+};
+
+static struct clk_lookup * __ref
+vclkdev_alloc(struct clk_hw *hw, const char *con_id, const char *dev_fmt,
+ va_list ap)
+{
+ struct clk_lookup_alloc *cla;
+
+ cla = kzalloc(sizeof(*cla), GFP_KERNEL);
+ if (!cla)
+ return NULL;
+
+ cla->cl.clk_hw = hw;
+ if (con_id) {
+ strlcpy(cla->con_id, con_id, sizeof(cla->con_id));
+ cla->cl.con_id = cla->con_id;
+ }
+
+ if (dev_fmt) {
+ vscnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap);
+ cla->cl.dev_id = cla->dev_id;
+ }
+
+ return &cla->cl;
+}
+
+static struct clk_lookup *
+vclkdev_create(struct clk_hw *hw, const char *con_id, const char *dev_fmt,
+ va_list ap)
+{
+ struct clk_lookup *cl;
+
+ cl = vclkdev_alloc(hw, con_id, dev_fmt, ap);
+ if (cl)
+ __clkdev_add(cl);
+
+ return cl;
+}
+
+struct clk_lookup * __ref
+clkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt, ...)
+{
+ struct clk_lookup *cl;
+ va_list ap;
+
+ va_start(ap, dev_fmt);
+ cl = vclkdev_alloc(__clk_get_hw(clk), con_id, dev_fmt, ap);
+ va_end(ap);
+
+ return cl;
+}
+EXPORT_SYMBOL(clkdev_alloc);
+
+struct clk_lookup *
+clkdev_hw_alloc(struct clk_hw *hw, const char *con_id, const char *dev_fmt, ...)
+{
+ struct clk_lookup *cl;
+ va_list ap;
+
+ va_start(ap, dev_fmt);
+ cl = vclkdev_alloc(hw, con_id, dev_fmt, ap);
+ va_end(ap);
+
+ return cl;
+}
+EXPORT_SYMBOL(clkdev_hw_alloc);
+
+/**
+ * clkdev_create - allocate and add a clkdev lookup structure
+ * @clk: struct clk to associate with all clk_lookups
+ * @con_id: connection ID string on device
+ * @dev_fmt: format string describing device name
+ *
+ * Returns a clk_lookup structure, which can be later unregistered and
+ * freed.
+ */
+struct clk_lookup *clkdev_create(struct clk *clk, const char *con_id,
+ const char *dev_fmt, ...)
+{
+ struct clk_lookup *cl;
+ va_list ap;
+
+ va_start(ap, dev_fmt);
+ cl = vclkdev_create(__clk_get_hw(clk), con_id, dev_fmt, ap);
+ va_end(ap);
+
+ return cl;
+}
+EXPORT_SYMBOL_GPL(clkdev_create);
+
+/**
+ * clkdev_hw_create - allocate and add a clkdev lookup structure
+ * @hw: struct clk_hw to associate with all clk_lookups
+ * @con_id: connection ID string on device
+ * @dev_fmt: format string describing device name
+ *
+ * Returns a clk_lookup structure, which can be later unregistered and
+ * freed.
+ */
+struct clk_lookup *clkdev_hw_create(struct clk_hw *hw, const char *con_id,
+ const char *dev_fmt, ...)
+{
+ struct clk_lookup *cl;
+ va_list ap;
+
+ va_start(ap, dev_fmt);
+ cl = vclkdev_create(hw, con_id, dev_fmt, ap);
+ va_end(ap);
+
+ return cl;
+}
+EXPORT_SYMBOL_GPL(clkdev_hw_create);
+
+int clk_add_alias(const char *alias, const char *alias_dev_name,
+ const char *con_id, struct device *dev)
+{
+ struct clk *r = clk_get(dev, con_id);
+ struct clk_lookup *l;
+
+ if (IS_ERR(r))
+ return PTR_ERR(r);
+
+ l = clkdev_create(r, alias, alias_dev_name ? "%s" : NULL,
+ alias_dev_name);
+ clk_put(r);
+
+ return l ? 0 : -ENODEV;
+}
+EXPORT_SYMBOL(clk_add_alias);
+
+/*
+ * clkdev_drop - remove a clock dynamically allocated
+ */
+void clkdev_drop(struct clk_lookup *cl)
+{
+ mutex_lock(&clocks_mutex);
+ list_del(&cl->node);
+ mutex_unlock(&clocks_mutex);
+ kfree(cl);
+}
+EXPORT_SYMBOL(clkdev_drop);
+
+static struct clk_lookup *__clk_register_clkdev(struct clk_hw *hw,
+ const char *con_id,
+ const char *dev_id, ...)
+{
+ struct clk_lookup *cl;
+ va_list ap;
+
+ va_start(ap, dev_id);
+ cl = vclkdev_create(hw, con_id, dev_id, ap);
+ va_end(ap);
+
+ return cl;
+}
+
+/**
+ * clk_register_clkdev - register one clock lookup for a struct clk
+ * @clk: struct clk to associate with all clk_lookups
+ * @con_id: connection ID string on device
+ * @dev_id: 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 clks
+ * from a previous clk_register() call, and return the error code for
+ * those. This is to permit this function to be called immediately
+ * after clk_register().
+ */
+int clk_register_clkdev(struct clk *clk, const char *con_id,
+ const char *dev_id)
+{
+ struct clk_lookup *cl;
+
+ 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;
+}
+EXPORT_SYMBOL(clk_register_clkdev);
+
+/**
+ * clk_hw_register_clkdev - register one clock lookup for a struct clk_hw
+ * @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 clk_hw_register_clkdev(struct clk_hw *hw, const char *con_id,
+ const char *dev_id)
+{
+ 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;
+}
+EXPORT_SYMBOL(clk_hw_register_clkdev);