[PATCH] clk: ti: change clock init to use generic of_clk_init

[Tero Kristo <t-kristo@ti.com>]

Previously, the TI clock driver initialized all the clocks hierarchically
under each separate clock provider node. Now, each clock that requires
IO access will instead check their parent node to find out which IO range
to use.

This patch allows the TI clock driver to use a few new features provided
by the generic of_clk_init, and also allows registration of clock nodes
outside the clock hierarchy (for example, any external clocks.)

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: Jyri Sarha <jsarha@ti.com>
Cc: Stefan Assmann <sassmann@kpanic.de>
---
 arch/arm/mach-omap2/io.c         |   10 ++++++++--
 arch/arm/mach-omap2/prm_common.c |    2 --
 drivers/clk/ti/clk.c             |   31 ++++++++++++++++---------------
 3 files changed, 24 insertions(+), 19 deletions(-)

diff --git a/arch/arm/mach-omap2/io.c b/arch/arm/mach-omap2/io.c
index 5d0667c..3325df6 100644
--- a/arch/arm/mach-omap2/io.c
+++ b/arch/arm/mach-omap2/io.c
@@ -734,8 +734,14 @@ int __init omap_clk_init(void)
 	ti_clk_init_features();
 
 	ret = of_prcm_init();
-	if (!ret)
-		ret = omap_clk_soc_init();
+	if (ret)
+		return ret;
+
+	of_clk_init(NULL);
+
+	ti_dt_clockdomains_setup();
+
+	ret = omap_clk_soc_init();
 
 	return ret;
 }
diff --git a/arch/arm/mach-omap2/prm_common.c b/arch/arm/mach-omap2/prm_common.c
index 76ca320..3b89080 100644
--- a/arch/arm/mach-omap2/prm_common.c
+++ b/arch/arm/mach-omap2/prm_common.c
@@ -525,8 +525,6 @@ int __init of_prcm_init(void)
 		memmap_index++;
 	}
 
-	ti_dt_clockdomains_setup();
-
 	return 0;
 }
 
diff --git a/drivers/clk/ti/clk.c b/drivers/clk/ti/clk.c
index b1a6f71..f7201d0 100644
--- a/drivers/clk/ti/clk.c
+++ b/drivers/clk/ti/clk.c
@@ -25,8 +25,8 @@
 #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;
+static struct device_node *clocks_node_ptr[CLK_MAX_MEMMAPS];
 
 /**
  * ti_dt_clocks_register - register DT alias clocks during boot
@@ -108,9 +108,21 @@ void __iomem *ti_clk_get_reg_addr(struct device_node *node, int index)
 	struct clk_omap_reg *reg;
 	u32 val;
 	u32 tmp;
+	int i;
 
 	reg = (struct clk_omap_reg *)&tmp;
-	reg->index = ti_dt_clk_memmap_index;
+
+	for (i = 0; i < CLK_MAX_MEMMAPS; i++) {
+		if (clocks_node_ptr[i] == node->parent)
+			break;
+	}
+
+	if (i == CLK_MAX_MEMMAPS) {
+		pr_err("clk-provider not found for %s!\n", node->name);
+		return NULL;
+	}
+
+	reg->index = i;
 
 	if (of_property_read_u32_index(node, "reg", index, &val)) {
 		pr_err("%s must have reg[%d]!\n", node->name, index);
@@ -133,15 +145,10 @@ void __iomem *ti_clk_get_reg_addr(struct device_node *node, int index)
  */
 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) {
@@ -149,14 +156,8 @@ void ti_dt_clk_init_provider(struct device_node *parent, int index)
 		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);
-	}
+	/* add clocks node info */
+	clocks_node_ptr[index] = clocks;
 
 	list_for_each_entry_safe(retry, tmp, &retry_list, link) {
 		pr_debug("retry-init: %s\n", retry->node->name);
-- 
1.7.9.5