[RESEND,PATCHv2,01/28] clk: ti: add ti_clk_get helper API

Commit Message

Tero Kristo June 13, 2016, 7:04 p.m. UTC

The API can be used to fetch directly DT clocks based on name. Using
this new API allows getting rid of most of the DT_CLK() entries under
drivers/clk/ti.

Signed-off-by: Tero Kristo <[e-mail]>
---
 drivers/clk/ti/clk.c   | 35 +++++++++++++++++++++++++++++------
 include/linux/clk/ti.h |  2 ++
 2 files changed, 31 insertions(+), 6 deletions(-)

Comments

Tony Lindgren June 28, 2016, 6:47 a.m. UTC | #1

* Tero Kristo <[e-mail]> [160613 12:07]:
> The API can be used to fetch directly DT clocks based on name. Using
> this new API allows getting rid of most of the DT_CLK() entries under
> drivers/clk/ti.

The description here is a bit confusing.. Rather than calling it API
how about say it's a helper function private to TI specific clock
code? Otherwise people might think it will be something more widely
available.

Regards,

Tony
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Tero Kristo June 29, 2016, 6:17 a.m. UTC | #2

On 28/06/16 09:47, Tony Lindgren wrote:
> * Tero Kristo <[e-mail]> [160613 12:07]:
>> The API can be used to fetch directly DT clocks based on name. Using
>> this new API allows getting rid of most of the DT_CLK() entries under
>> drivers/clk/ti.
>
> The description here is a bit confusing.. Rather than calling it API
> how about say it's a helper function private to TI specific clock
> code? Otherwise people might think it will be something more widely
> available.

Yea, I can drop the API part from the desc, if we are going forward with 
this series.

-Tero
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Patch

diff --git a/drivers/clk/ti/clk.c b/drivers/clk/ti/clk.c
index 5fcf247..3dcf97e 100644
--- a/drivers/clk/ti/clk.c
+++ b/drivers/clk/ti/clk.c
@@ -68,6 +68,33 @@  static u32 clk_memmap_readl(void __iomem *reg)
 }
 
 /**
+ * ti_clk_get - lookup a TI clock handle
+ * @name: clock to find
+ *
+ * Searches for a TI clock handle. Will first attempt to search for a
+ * clock based on a DT node name, but if this fails, will revert to
+ * looking up a clock alias. Returns the pointer to the clock handle,
+ * or ERR_PTR in failure.
+ */
+struct clk *ti_clk_get(const char *name)
+{
+	struct of_phandle_args clkspec;
+	struct device_node *node;
+	struct clk *clk;
+
+	if (of_have_populated_dt()) {
+		node = of_find_node_by_name(NULL, name);
+		clkspec.np = node;
+		clk = of_clk_get_from_provider(&clkspec);
+
+		if (!IS_ERR(clk))
+			return clk;
+	}
+
+	return clk_get(NULL, name);
+}
+
+/**
  * ti_clk_setup_ll_ops - setup low level clock operations
  * @ops: low level clock ops descriptor
  *
@@ -102,14 +129,10 @@  int ti_clk_setup_ll_ops(struct ti_clk_ll_ops *ops)
 void __init ti_dt_clocks_register(struct ti_dt_clk oclks[])
 {
 	struct ti_dt_clk *c;
-	struct device_node *node;
 	struct clk *clk;
-	struct of_phandle_args clkspec;
 
 	for (c = oclks; c->node_name != NULL; c++) {
-		node = of_find_node_by_name(NULL, c->node_name);
-		clkspec.np = node;
-		clk = of_clk_get_from_provider(&clkspec);
+		clk = ti_clk_get(c->node_name);
 
 		if (!IS_ERR(clk)) {
 			c->lk.clk = clk;
@@ -446,7 +469,7 @@  void omap2_clk_enable_init_clocks(const char **clk_names, u8 num_clocks)
 	int i;
 
 	for (i = 0; i < num_clocks; i++) {
-		init_clk = clk_get(NULL, clk_names[i]);
+		init_clk = ti_clk_get(clk_names[i]);
 		if (WARN(IS_ERR(init_clk), "could not find init clock %s\n",
 			 clk_names[i]))
 			continue;
diff --git a/include/linux/clk/ti.h b/include/linux/clk/ti.h
index 6110fe0..331b81b 100644
--- a/include/linux/clk/ti.h
+++ b/include/linux/clk/ti.h
@@ -294,6 +294,8 @@  struct ti_clk_features {
 void ti_clk_setup_features(struct ti_clk_features *features);
 const struct ti_clk_features *ti_clk_get_features(void);
 
+struct clk *ti_clk_get(const char *name);
+
 extern const struct clk_hw_omap_ops clkhwops_omap2xxx_dpll;
 
 #ifdef CONFIG_ATAGS