[PATCH 4.9 011/111] clk: clk-fixed-factor: Clear OF_POPULATED flag in case of failure

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Rajan Vaja <rajan.vaja@xxxxxxxxxx>

[ Upstream commit f6dab4233d6b64d719109040503b567f71fbfa01 ]

Fixed factor clock has two initializations at of_clk_init() time
and during platform driver probe. Before of_clk_init() call,
node is marked as populated and so its probe never gets called.

During of_clk_init() fixed factor clock registration may fail if
any of its parent clock is not registered. In this case, it doesn't
get chance to retry registration from probe. Clear OF_POPULATED
flag if fixed factor clock registration fails so that clock
registration is attempted again from probe.

Signed-off-by: Rajan Vaja <rajan.vaja@xxxxxxxxxx>
Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/clk/clk-fixed-factor.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- a/drivers/clk/clk-fixed-factor.c
+++ b/drivers/clk/clk-fixed-factor.c
@@ -177,8 +177,15 @@ static struct clk *_of_fixed_factor_clk_
 
 	clk = clk_register_fixed_factor(NULL, clk_name, parent_name, flags,
 					mult, div);
-	if (IS_ERR(clk))
+	if (IS_ERR(clk)) {
+		/*
+		 * If parent clock is not registered, registration would fail.
+		 * Clear OF_POPULATED flag so that clock registration can be
+		 * attempted again from probe function.
+		 */
+		of_node_clear_flag(node, OF_POPULATED);
 		return clk;
+	}
 
 	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
 	if (ret) {