ti_dt_clk_init_provider() can now be used to initialize the contents of
a single clock IP block. This parses all the clocks under the IP block
and calls the corresponding init function for them.
This patch also introduces a helper function for the TI clock drivers
to get register info from DT and append the master IP info to this.
Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
---
drivers/clk/ti/clk.c | 98 ++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/clk/ti.h | 14 +++++++
2 files changed, 112 insertions(+)
diff --git a/drivers/clk/ti/clk.c b/drivers/clk/ti/clk.c
index ef1a7cd..63f85e9 100644
--- a/drivers/clk/ti/clk.c
+++ b/drivers/clk/ti/clk.c
@@ -19,10 +19,15 @@
#include <linux/clkdev.h>
#include <linux/clk/ti.h>
#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/list.h>
#undef pr_fmt
#define pr_fmt(fmt) "%s: " fmt, __func__
+extern struct of_device_id __clk_of_table[];
+static int ti_dt_clk_regmap_index;
+
/**
* ti_dt_clocks_register - register DT alias clocks during boot
* @oclks: list of clocks to register
@@ -53,3 +58,96 @@ void __init ti_dt_clocks_register(struct ti_dt_clk oclks[])
}
}
}
+
+typedef int (*ti_of_clk_init_cb_t)(struct device_node *);
+
+struct clk_init_item {
+ int index;
+ struct device_node *np;
+ ti_of_clk_init_cb_t init_cb;
+ struct list_head node;
+};
+
+static LIST_HEAD(retry_list);
+
+/**
+ * ti_clk_get_reg_addr - get register address for a clock register
+ * @node: device node for the clock
+ * @index: register index from the clock node
+ *
+ * Builds clock register address from device tree information. This
+ * is a struct of type clk_omap_reg.
+ */
+void __iomem *ti_clk_get_reg_addr(struct device_node *node, int index)
+{
+ struct clk_omap_reg *reg;
+ u32 val;
+ u32 tmp;
+
+ reg = (struct clk_omap_reg *)&tmp;
+ reg->index = ti_dt_clk_regmap_index;
+
+ if (of_property_read_u32_index(node, "reg", index, &val)) {
+ pr_err("%s must have reg[%d]!\n", node->name, index);
+ return NULL;
+ }
+
+ reg->offset = val;
+
+ return (void __iomem *)tmp;
+}
+
+/**
+ * ti_dt_clk_init_provider - init master clock provider
+ * @parent: master node
+ * @index: internal index for clk_reg_ops
+ *
+ * Initializes a master clock IP block and its child clock nodes.
+ * Regmap is provided for accessing the register space for the
+ * IP block and all the clocks under it.
+ */
+void ti_dt_clk_init_provider(struct device_node *parent, int index)
+{
+ const struct of_device_id *match;
+ struct device_node *np;
+ ti_of_clk_init_cb_t clk_init_cb;
+ struct clk_init_item *retry;
+ struct clk_init_item *tmp;
+ int ret;
+
+ ti_dt_clk_regmap_index = index;
+
+ for_each_child_of_node(parent, np) {
+ match = of_match_node(__clk_of_table, np);
+ if (!match)
+ continue;
+ clk_init_cb = (ti_of_clk_init_cb_t)match->data;
+ pr_debug("%s: initializing: %s\n", __func__, np->name);
+ ret = clk_init_cb(np);
+ if (ret == -EAGAIN) {
+ pr_debug("%s: adding to again list...\n", np->name);
+ retry = kzalloc(sizeof(*retry), GFP_KERNEL);
+ retry->np = np;
+ retry->init_cb = clk_init_cb;
+ list_add(&retry->node, &retry_list);
+ } else if (ret) {
+ pr_err("%s: clock init failed for %s (%d)!\n", __func__,
+ np->name, ret);
+ }
+ }
+
+ list_for_each_entry_safe(retry, tmp, &retry_list, node) {
+ pr_debug("%s: retry-init: %s\n", __func__, retry->np->name);
+ ti_dt_clk_regmap_index = retry->index;
+ ret = retry->init_cb(retry->np);
+ if (ret == -EAGAIN) {
+ pr_debug("%s failed again?\n", retry->np->name);
+ } else {
+ if (ret)
+ pr_err("%s: clock init failed for %s (%d)!\n",
+ __func__, retry->np->name, ret);
+ list_del(&retry->node);
+ kfree(retry);
+ }
+ }
+}
diff --git a/include/linux/clk/ti.h b/include/linux/clk/ti.h
index df94c24..d6bf530 100644
--- a/include/linux/clk/ti.h
+++ b/include/linux/clk/ti.h
@@ -36,7 +36,21 @@ struct ti_dt_clk {
.node_name = name, \
}
+/* Maximum number of clock regmaps */
+#define CLK_MAX_REGMAPS 4
+/**
+ * struct clk_omap_reg - OMAP register declaration
+ * @offset: offset from the master IP module base address
+ * @index: index of the master IP module
+ */
+struct clk_omap_reg {
+ u16 offset;
+ u16 index;
+};
+
+void __iomem *ti_clk_get_reg_addr(struct device_node *node, int index);
void ti_dt_clocks_register(struct ti_dt_clk *oclks);
+void ti_dt_clk_init_provider(struct device_node *np, int index);
#endif
--
1.7.9.5
--
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