At probe time, a clock device may not be ready when some other device
wants to use it.
This patch lets the functions clk_get/devm_clk_get return a probe defer
when the clock is defined in the DT but not yet available.
It also fixes an erroneous call to clk_get_sys() when __clk_get() fails.
Signed-off-by: Jean-Francois Moine <moinejf@xxxxxxx>
---
resend: - patch subject change from
[PATCH v3 1/2] ASoC: kirkwood: clk: probe defer when clock not yet ready
- base kernel 3.13.0-rc1
v2: fix __clk_get() failure (from Russell King)
---
drivers/clk/clk.c | 2 +-
drivers/clk/clkdev.c | 7 ++++++-
2 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 2cf2ea6..41361c6 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2187,7 +2187,7 @@ EXPORT_SYMBOL_GPL(of_clk_del_provider);
struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec)
{
struct of_clk_provider *provider;
- struct clk *clk = ERR_PTR(-ENOENT);
+ struct clk *clk = ERR_PTR(-EPROBE_DEFER);
/* Check if we have such a provider in our array */
mutex_lock(&of_clk_lock);
diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index 442a313..1f402b9 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -157,7 +157,12 @@ struct clk *clk_get(struct device *dev, const char *con_id)
if (dev) {
clk = of_clk_get_by_name(dev->of_node, con_id);
- if (!IS_ERR(clk) && __clk_get(clk))
+ if (!IS_ERR(clk)) {
+ if (!__clk_get(clk))
+ clk = ERR_PTR(-ENOENT);
+ return clk;
+ }
+ if (PTR_ERR(clk) == -EPROBE_DEFER)
return clk;
}
--
Ken ar c'hentañ | ** Breizh ha Linux atav! **
Jef | http://moinejf.free.fr/
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