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.
Signed-off-by: Jean-Francois Moine moinejf@free.fr --- drivers/clk/clk.c | 2 +- drivers/clk/clkdev.c | 9 +++++++-- 2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index a004769..582abc8 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -2181,7 +2181,7 @@ 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..f8b28d9 100644 --- a/drivers/clk/clkdev.c +++ b/drivers/clk/clkdev.c @@ -157,8 +157,13 @@ 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)) - return clk; + if (!IS_ERR(clk)) { + if (__clk_get(clk)) + return clk; + } else { + if (PTR_ERR(clk) == -EPROBE_DEFER) + return clk; + } }
return clk_get_sys(dev_id, con_id);