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author | Sascha Hauer <s.hauer@pengutronix.de> | 2020-08-27 09:26:11 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2020-09-24 11:42:01 +0200 |
commit | a16f065ae6c17704afe4ed6a4fd3772285a86e6e (patch) | |
tree | c6e2af7a27df6aa2547a066c28200c5584a36a89 | |
parent | 76cff1a4ae09964cd59fc26e22efda9436e325a2 (diff) | |
download | barebox-a16f065ae6c17704afe4ed6a4fd3772285a86e6e.tar.gz barebox-a16f065ae6c17704afe4ed6a4fd3772285a86e6e.tar.xz |
clk: Add clk_bulk_[get|put]_all()
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r-- | drivers/clk/clk-bulk.c | 80 | ||||
-rw-r--r-- | include/linux/clk.h | 46 |
2 files changed, 126 insertions, 0 deletions
diff --git a/drivers/clk/clk-bulk.c b/drivers/clk/clk-bulk.c index ddbe32f9c2..b8db60dcbc 100644 --- a/drivers/clk/clk-bulk.c +++ b/drivers/clk/clk-bulk.c @@ -53,6 +53,86 @@ err: } EXPORT_SYMBOL(clk_bulk_get); +static int __must_check of_clk_bulk_get(struct device_node *np, int num_clks, + struct clk_bulk_data *clks) +{ + int ret; + int i; + + for (i = 0; i < num_clks; i++) { + clks[i].id = NULL; + clks[i].clk = NULL; + } + + for (i = 0; i < num_clks; i++) { + of_property_read_string_index(np, "clock-names", i, &clks[i].id); + clks[i].clk = of_clk_get(np, i); + if (IS_ERR(clks[i].clk)) { + ret = PTR_ERR(clks[i].clk); + pr_err("%pOF: Failed to get clk index: %d ret: %d\n", + np, i, ret); + clks[i].clk = NULL; + goto err; + } + } + + return 0; + +err: + clk_bulk_put(i, clks); + + return ret; +} + +static int __must_check of_clk_bulk_get_all(struct device_node *np, + struct clk_bulk_data **clks) +{ + struct clk_bulk_data *clk_bulk; + int num_clks; + int ret; + + num_clks = of_clk_get_parent_count(np); + if (!num_clks) + return 0; + + clk_bulk = kmalloc_array(num_clks, sizeof(*clk_bulk), GFP_KERNEL); + if (!clk_bulk) + return -ENOMEM; + + ret = of_clk_bulk_get(np, num_clks, clk_bulk); + if (ret) { + kfree(clk_bulk); + return ret; + } + + *clks = clk_bulk; + + return num_clks; +} + +void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks) +{ + if (IS_ERR_OR_NULL(clks)) + return; + + clk_bulk_put(num_clks, clks); + + kfree(clks); +} +EXPORT_SYMBOL(clk_bulk_put_all); + +int __must_check clk_bulk_get_all(struct device_d *dev, + struct clk_bulk_data **clks) +{ + struct device_node *np = dev->device_node; + + if (!np) + return 0; + + return of_clk_bulk_get_all(np, clks); +} +EXPORT_SYMBOL(clk_bulk_get_all); + /** * clk_bulk_disable - gate a set of clocks * @num_clks: the number of clk_bulk_data diff --git a/include/linux/clk.h b/include/linux/clk.h index 3d66343e8d..c49fe9a54c 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -83,6 +83,27 @@ int __must_check clk_bulk_get(struct device_d *dev, int num_clks, struct clk_bulk_data *clks); /** + * clk_bulk_get_all - lookup and obtain all available references to clock + * producer. + * @dev: device for clock "consumer" + * @clks: pointer to the clk_bulk_data table of consumer + * + * This helper function allows drivers to get all clk consumers in one + * operation. If any of the clk cannot be acquired then any clks + * that were obtained will be freed before returning to the caller. + * + * Returns a positive value for the number of clocks obtained while the + * clock references are stored in the clk_bulk_data table in @clks field. + * Returns 0 if there're none and a negative value if something failed. + * + * Drivers must assume that the clock source is not enabled. + * + * clk_bulk_get should not be called from within interrupt context. + */ +int __must_check clk_bulk_get_all(struct device_d *dev, + struct clk_bulk_data **clks); + +/** * clk_enable - inform the system when the clock source should be running. * @clk: clock source * @@ -156,6 +177,19 @@ unsigned long clk_get_rate(struct clk *clk); */ void clk_bulk_put(int num_clks, struct clk_bulk_data *clks); +/** + * clk_bulk_put_all - "free" all the clock source + * @num_clks: the number of clk_bulk_data + * @clks: the clk_bulk_data table of consumer + * + * Note: drivers must ensure that all clk_bulk_enable calls made on this + * clock source are balanced by clk_bulk_disable calls prior to calling + * this function. + * + * clk_bulk_put_all should not be called from within interrupt context. + */ +void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks); + /* * The remaining APIs are optional for machine class support. */ @@ -240,8 +274,16 @@ static inline int __must_check clk_bulk_get(struct device_d *dev, int num_clks, return 0; } +static inline int __must_check clk_bulk_get_all(struct device_d *dev, + struct clk_bulk_data **clks) +{ + return 0; +} + static inline void clk_bulk_put(int num_clks, struct clk_bulk_data *clks) {} +static inline void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks) {} + static inline int clk_enable(struct clk *clk) { return 0; @@ -536,6 +578,10 @@ static inline struct clk *of_clk_get_by_name(struct device_node *np, { return ERR_PTR(-ENOENT); } +static inline unsigned int of_clk_get_parent_count(struct device_node *np) +{ + return 0; +} static inline int of_clk_init(struct device_node *root, const struct of_device_id *matches) { |