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/clk.c | 4 +-
drivers/clk/ti/clk.c | 112 ++++++++++++++++++++++++++++++++++++++++++
include/linux/clk-provider.h | 2 +
include/linux/clk/ti.h | 35 +++++++++++++
4 files changed, 150 insertions(+), 3 deletions(-)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 2cf2ea6..bbbe799 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2104,8 +2104,6 @@ struct of_clk_provider {
void *data;
};
-extern struct of_device_id __clk_of_table[];
-
static const struct of_device_id __clk_of_table_sentinel
__used __section(__clk_of_table_end);
@@ -2245,7 +2243,7 @@ void __init of_clk_init(const struct of_device_id *matches)
struct device_node *np;
if (!matches)
- matches = __clk_of_table;
+ matches = &__clk_of_table;
for_each_matching_node_and_match(np, matches, &match) {
of_clk_init_cb_t clk_init_cb = match->data;
diff --git a/drivers/clk/ti/clk.c b/drivers/clk/ti/clk.c
index ef1a7cd..b1a6f71 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__
+static int ti_dt_clk_memmap_index;
+struct ti_clk_ll_ops *ti_clk_ll_ops;
+
/**
* ti_dt_clocks_register - register DT alias clocks during boot
* @oclks: list of clocks to register
@@ -53,3 +58,110 @@ void __init ti_dt_clocks_register(struct ti_dt_clk oclks[])
}
}
}
+
+struct clk_init_item {
+ struct device_node *node;
+ struct clk_hw *hw;
+ ti_of_clk_init_cb_t func;
+ struct list_head link;
+};
+
+static LIST_HEAD(retry_list);
+
+/**
+ * ti_clk_retry_init - retries a failed clock init at later phase
+ * @node: device not for the clock
+ * @hw: partially initialized clk_hw struct for the clock
+ * @func: init function to be called for the clock
+ *
+ * Adds a failed clock init to the retry list. The retry list is parsed
+ * once all the other clocks have been initialized.
+ */
+int __init ti_clk_retry_init(struct device_node *node, struct clk_hw *hw,
+ ti_of_clk_init_cb_t func)
+{
+ struct clk_init_item *retry;
+
+ pr_debug("%s: adding to retry list...\n", node->name);
+ retry = kzalloc(sizeof(*retry), GFP_KERNEL);
+ if (!retry)
+ return -ENOMEM;
+
+ retry->node = node;
+ retry->func = func;
+ retry->hw = hw;
+ list_add(&retry->link, &retry_list);
+
+ return 0;
+}
+
+/**
+ * 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_memmap_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;
+ struct device_node *clocks;
+ of_clk_init_cb_t clk_init_cb;
+ struct clk_init_item *retry;
+ struct clk_init_item *tmp;
+
+ ti_dt_clk_memmap_index = index;
+
+ /* get clocks for this parent */
+ clocks = of_get_child_by_name(parent, "clocks");
+ if (!clocks) {
+ pr_err("%s missing 'clocks' child node.\n", parent->name);
+ return;
+ }
+
+ for_each_child_of_node(clocks, np) {
+ match = of_match_node(&__clk_of_table, np);
+ if (!match)
+ continue;
+ clk_init_cb = (of_clk_init_cb_t)match->data;
+ pr_debug("%s: initializing: %s\n", __func__, np->name);
+ clk_init_cb(np);
+ }
+
+ list_for_each_entry_safe(retry, tmp, &retry_list, link) {
+ pr_debug("retry-init: %s\n", retry->node->name);
+ retry->func(retry->hw, retry->node);
+ list_del(&retry->link);
+ kfree(retry);
+ }
+}
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 7e59253..5760dc8 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -458,6 +458,8 @@ struct clk_onecell_data {
unsigned int clk_num;
};
+extern struct of_device_id __clk_of_table;
+
#define CLK_OF_DECLARE(name, compat, fn) \
static const struct of_device_id __clk_of_table_##name \
__used __section(__clk_of_table) \
diff --git a/include/linux/clk/ti.h b/include/linux/clk/ti.h
index df94c24..c6eded5 100644
--- a/include/linux/clk/ti.h
+++ b/include/linux/clk/ti.h
@@ -36,7 +36,42 @@ struct ti_dt_clk {
.node_name = name, \
}
+/* Maximum number of clock memmaps */
+#define CLK_MAX_MEMMAPS 4
+typedef void (*ti_of_clk_init_cb_t)(struct clk_hw *, struct device_node *);
+
+/**
+ * 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;
+};
+
+/**
+ * struct ti_clk_ll_ops - low-level register access ops for a clock
+ * @clk_readl: pointer to register read function
+ * @clk_writel: pointer to register write function
+ *
+ * Low-level register access ops are generally used by the basic clock types
+ * (clk-gate, clk-mux, clk-divider etc.) to provide support for various
+ * low-level hardware interfaces (direct MMIO, regmap etc.), but can also be
+ * used by other hardware-specific clock drivers if needed.
+ */
+struct ti_clk_ll_ops {
+ u32 (*clk_readl)(void __iomem *reg);
+ void (*clk_writel)(u32 val, void __iomem *reg);
+};
+
+extern struct ti_clk_ll_ops *ti_clk_ll_ops;
+
+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);
+int ti_clk_retry_init(struct device_node *node, struct clk_hw *hw,
+ ti_of_clk_init_cb_t func);
#endif
--
1.7.9.5
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