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From 1ce8667062bc7b8813adf6103ad2374d9dd52fb0 Mon Sep 17 00:00:00 2001
From: Jean-Francois Moine <moinejf@free.fr>
Date: Mon, 25 Nov 2013 19:47:04 +0100
Subject: [PATCH 163/182] clk: return probe defer when DT clock not yet ready
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>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Tested-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
---
drivers/clk/clk.c | 2 +-
drivers/clk/clkdev.c | 2 ++
2 files changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2502,7 +2502,7 @@ 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 */
list_for_each_entry(provider, &of_clk_providers, link) {
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -167,6 +167,8 @@ struct clk *clk_get(struct device *dev,
clk = of_clk_get_by_name(dev->of_node, con_id);
if (!IS_ERR(clk))
return clk;
+ if (PTR_ERR(clk) == -EPROBE_DEFER)
+ return clk;
}
return clk_get_sys(dev_id, con_id);
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