[PATCH] clk: bulk: call of_clk_get() when id is NULL

[Shawn Guo <shawnguo@kernel.org>]

From: Shawn Guo <shawn.guo@linaro.org>

Most of clk API users have their clocks defined in device tree, and
client drivers will have to parse clk ids from DT 'clock-names'
property before using clk_bulk_get().  This is a burden for client
driver code.  And 'clock-names' being an optional DT property makes
it even worse.  The client driver will have no way to provide clock
id.

The patch makes a little improvement on clk_bulk_get() to call
of_clk_get() with index for DT users, if clock id is not available,
so that client drivers working with DT can use clk_bulk_get() to
retrieve clocks more easily.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
 drivers/clk/clk-bulk.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk-bulk.c b/drivers/clk/clk-bulk.c
index c834f5abfc49..65cee595a67e 100644
--- a/drivers/clk/clk-bulk.c
+++ b/drivers/clk/clk-bulk.c
@@ -39,7 +39,10 @@ int __must_check clk_bulk_get(struct device *dev, int num_clks,
 		clks[i].clk = NULL;
 
 	for (i = 0; i < num_clks; i++) {
-		clks[i].clk = clk_get(dev, clks[i].id);
+		if (clks[i].id)
+			clks[i].clk = clk_get(dev, clks[i].id);
+		else if (dev->of_node)
+			clks[i].clk = of_clk_get(dev->of_node, i);
 		if (IS_ERR(clks[i].clk)) {
 			ret = PTR_ERR(clks[i].clk);
 			dev_err(dev, "Failed to get clk '%s': %d\n",
-- 
1.9.1