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clk: Add of_clk_hw_register() API for early clk drivers 

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>
Tested-by: Jeffrey Hugo <jhugo@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Stephen Boyd 2019-04-12 11:31:46 -07:00
parent 1b833924e5
commit 89a5ddcc79
2 changed files with 24 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/clk/clk.c
View File

@ -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 @@ fail_out:
*/
struct clk *clk_register(struct device *dev, struct clk_hw *hw)
{
return __clk_register(dev, hw);
return __clk_register(dev, dev_of_node(dev), 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(dev), 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)
{

1
include/linux/clk-provider.h
View File

@ -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);