clk: handle CLK_OF_DECLARE in deep probe

An assigned-clock-parents referring to a fixed-clock will result in a
warning:

  WARNING: clk: couldn't get parent clock 0 for /ethernet@fe300000

That's because the device for the fixed clock is created on demand and
even after ensuring probe, no driver will have bound against it as
CLK_OF_DECLARE operates outside the driver model.

Fix this by creating devices and binding the dummy driver while
iterating over the CLK_OF_DECLARE list. No functional change for
systems not enabling deep-probe.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20211108075209.2366770-7-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index fff1e21144..189c9c62df 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -845,9 +845,15 @@ int of_clk_init(struct device_node *root, const struct of_device_id *matches)
 
 			struct device_node *np = clk_provider->np;
 			if (force || parent_ready(np)) {
+				struct device_d *dev;
 
 				of_pinctrl_select_state_default(np);
-				clk_provider->clk_init_cb(np);
+
+				dev = of_device_create_on_demand(np);
+
+				if (clk_provider->clk_init_cb(np) == 0 && dev)
+					of_platform_device_dummy_drv(dev);
+
 				of_clk_set_defaults(np, true);
 
 				list_del(&clk_provider->node);