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Subject[PATCH v3 3/7] clk: Add of_clk_hw_register() API for early clk drivers
Date
In some circumstances drivers register clks early and don't have access
to a struct device because the device model isn't initialized yet. Add
an API to let drivers register clks associated with a struct device_node
so that these drivers can participate in getting parent clks through DT.

Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Jeffrey Hugo <jhugo@codeaurora.org>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
---
drivers/clk/clk.c | 26 +++++++++++++++++++++++---
include/linux/clk-provider.h | 1 +
2 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index d27775a73e67..4971e9651ca5 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -45,6 +45,7 @@ struct clk_core {
struct clk_hw *hw;
struct module *owner;
struct device *dev;
+ struct device_node *of_node;
struct clk_core *parent;
const char **parent_names;
struct clk_core **parents;
@@ -3313,7 +3314,8 @@ struct clk *clk_hw_create_clk(struct device *dev, struct clk_hw *hw,
return clk;
}

-static struct clk *__clk_register(struct device *dev, struct clk_hw *hw)
+static struct clk *
+__clk_register(struct device *dev, struct device_node *np, struct clk_hw *hw)
{
int i, ret;
struct clk_core *core;
@@ -3339,6 +3341,7 @@ static struct clk *__clk_register(struct device *dev, struct clk_hw *hw)
if (dev && pm_runtime_enabled(dev))
core->rpm_enabled = true;
core->dev = dev;
+ core->of_node = np;
if (dev && dev->driver)
core->owner = dev->driver->owner;
core->hw = hw;
@@ -3429,7 +3432,7 @@ static struct clk *__clk_register(struct device *dev, struct clk_hw *hw)
*/
struct clk *clk_register(struct device *dev, struct clk_hw *hw)
{
- return __clk_register(dev, hw);
+ return __clk_register(dev, dev->of_node, hw);
}
EXPORT_SYMBOL_GPL(clk_register);

@@ -3445,10 +3448,27 @@ EXPORT_SYMBOL_GPL(clk_register);
*/
int clk_hw_register(struct device *dev, struct clk_hw *hw)
{
- return PTR_ERR_OR_ZERO(__clk_register(dev, hw));
+ return PTR_ERR_OR_ZERO(__clk_register(dev, dev->of_node, hw));
}
EXPORT_SYMBOL_GPL(clk_hw_register);

+/*
+ * of_clk_hw_register - register a clk_hw and return an error code
+ * @node: device_node of device that is registering this clock
+ * @hw: link to hardware-specific clock data
+ *
+ * of_clk_hw_register() is the primary interface for populating the clock tree
+ * with new clock nodes when a struct device is not available, but a struct
+ * device_node is. It returns an integer equal to zero indicating success or
+ * less than zero indicating failure. Drivers must test for an error code after
+ * calling of_clk_hw_register().
+ */
+int of_clk_hw_register(struct device_node *node, struct clk_hw *hw)
+{
+ return PTR_ERR_OR_ZERO(__clk_register(NULL, node, hw));
+}
+EXPORT_SYMBOL_GPL(of_clk_hw_register);
+
/* Free memory allocated for a clock. */
static void __clk_release(struct kref *ref)
{
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index b7cf80a71293..7d2d97e15b76 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -773,6 +773,7 @@ struct clk *devm_clk_register(struct device *dev, struct clk_hw *hw);

int __must_check clk_hw_register(struct device *dev, struct clk_hw *hw);
int __must_check devm_clk_hw_register(struct device *dev, struct clk_hw *hw);
+int __must_check of_clk_hw_register(struct device_node *node, struct clk_hw *hw);

void clk_unregister(struct clk *clk);
void devm_clk_unregister(struct device *dev, struct clk *clk);
--
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