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clk: Look for parents with clkdev based clk_lookups

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In addition to looking for DT based parents, support clkdev based
clk_lookups. This should allow non-DT based clk drivers to participate
in the parent lookup process.

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>
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 11:31:48 -07:00
parent fc0c209c14
commit dde4eff47c
3 changed files with 21 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/clk/clk.c
View File

@ -324,14 +324,15 @@ static struct clk_core *clk_core_lookup(const char *name)
}
/**
* clk_core_get - Find the parent of a clk using a clock specifier in DT
* clk_core_get - Find the clk_core parent of a clk
* @core: clk to find parent of
* @name: name to search for in 'clock-names' of device providing clk
* @name: name to search for
*
* This is the preferred method for clk providers to find the parent of a
* clk when that parent is external to the clk controller. The parent_names
* array is indexed and treated as a local name matching a string in the device
* node's 'clock-names' property. This allows clk providers to use their own
* node's 'clock-names' property or as the 'con_id' matching the device's
* dev_name() in a clk_lookup. This allows clk providers to use their own
* namespace instead of looking for a globally unique parent string.
*
* For example the following DT snippet would allow a clock registered by the
@ -359,15 +360,23 @@ static struct clk_core *clk_core_lookup(const char *name)
*/
static struct clk_core *clk_core_get(struct clk_core *core, const char *name)
{
struct clk_hw *hw;
struct clk_hw *hw = ERR_PTR(-ENOENT);
struct device *dev = core->dev;
const char *dev_id = dev ? dev_name(dev) : NULL;
struct device_node *np = core->of_node;
if (!np)
return ERR_PTR(-ENOENT);
if (np)
hw = of_clk_get_hw(np, -1, name);
/* TODO: Support clkdev clk_lookups */
hw = of_clk_get_hw(np, -1, name);
if (IS_ERR_OR_NULL(hw))
/*
* If the DT search above couldn't find the provider or the provider
* didn't know about this clk, fallback to looking up via clkdev based
* clk_lookups
*/
if (PTR_ERR(hw) == -ENOENT)
hw = clk_find_hw(dev_id, name);
if (IS_ERR(hw))
return ERR_CAST(hw);
return hw->core;

2
drivers/clk/clk.h
View File

@ -19,6 +19,8 @@ static inline struct clk_hw *of_clk_get_hw(struct device_node *np,
}
#endif
struct clk_hw *clk_find_hw(const char *dev_id, const char *con_id);
#ifdef CONFIG_COMMON_CLK
struct clk *clk_hw_create_clk(struct device *dev, struct clk_hw *hw,
const char *dev_id, const char *con_id);

2
drivers/clk/clkdev.c
View File

@ -72,7 +72,7 @@ static struct clk_lookup *clk_find(const char *dev_id, const char *con_id)
return cl;
}
static struct clk_hw *clk_find_hw(const char *dev_id, const char *con_id)
struct clk_hw *clk_find_hw(const char *dev_id, const char *con_id)
{
struct clk_lookup *cl;
struct clk_hw *hw = ERR_PTR(-ENOENT);