diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/clk/clk-bulk.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/drivers/clk/clk-bulk.c b/drivers/clk/clk-bulk.c new file mode 100644 index 000000000..e9e16425c --- /dev/null +++ b/drivers/clk/clk-bulk.c @@ -0,0 +1,248 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2017 NXP + * + * Dong Aisheng <aisheng.dong@nxp.com> + */ + +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/device.h> +#include <linux/export.h> +#include <linux/of.h> +#include <linux/slab.h> + +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(int num_clks, struct clk_bulk_data *clks) +{ + while (--num_clks >= 0) { + clk_put(clks[num_clks].clk); + clks[num_clks].clk = NULL; + } +} +EXPORT_SYMBOL_GPL(clk_bulk_put); + +static int __clk_bulk_get(struct device *dev, int num_clks, + struct clk_bulk_data *clks, bool optional) +{ + int ret; + int i; + + for (i = 0; i < num_clks; i++) + clks[i].clk = NULL; + + for (i = 0; i < num_clks; i++) { + clks[i].clk = clk_get(dev, clks[i].id); + if (IS_ERR(clks[i].clk)) { + ret = PTR_ERR(clks[i].clk); + clks[i].clk = NULL; + + if (ret == -ENOENT && optional) + continue; + + if (ret != -EPROBE_DEFER) + dev_err(dev, "Failed to get clk '%s': %d\n", + clks[i].id, ret); + goto err; + } + } + + return 0; + +err: + clk_bulk_put(i, clks); + + return ret; +} + +int __must_check clk_bulk_get(struct device *dev, int num_clks, + struct clk_bulk_data *clks) +{ + return __clk_bulk_get(dev, num_clks, clks, false); +} +EXPORT_SYMBOL(clk_bulk_get); + +int __must_check clk_bulk_get_optional(struct device *dev, int num_clks, + struct clk_bulk_data *clks) +{ + return __clk_bulk_get(dev, num_clks, clks, true); +} +EXPORT_SYMBOL_GPL(clk_bulk_get_optional); + +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 *dev, + struct clk_bulk_data **clks) +{ + struct device_node *np = dev_of_node(dev); + + if (!np) + return 0; + + return of_clk_bulk_get_all(np, clks); +} +EXPORT_SYMBOL(clk_bulk_get_all); + +#ifdef CONFIG_HAVE_CLK_PREPARE + +/** + * clk_bulk_unprepare - undo preparation of a set of clock sources + * @num_clks: the number of clk_bulk_data + * @clks: the clk_bulk_data table being unprepared + * + * clk_bulk_unprepare may sleep, which differentiates it from clk_bulk_disable. + * Returns 0 on success, -EERROR otherwise. + */ +void clk_bulk_unprepare(int num_clks, const struct clk_bulk_data *clks) +{ + while (--num_clks >= 0) + clk_unprepare(clks[num_clks].clk); +} +EXPORT_SYMBOL_GPL(clk_bulk_unprepare); + +/** + * clk_bulk_prepare - prepare a set of clocks + * @num_clks: the number of clk_bulk_data + * @clks: the clk_bulk_data table being prepared + * + * clk_bulk_prepare may sleep, which differentiates it from clk_bulk_enable. + * Returns 0 on success, -EERROR otherwise. + */ +int __must_check clk_bulk_prepare(int num_clks, + const struct clk_bulk_data *clks) +{ + int ret; + int i; + + for (i = 0; i < num_clks; i++) { + ret = clk_prepare(clks[i].clk); + if (ret) { + pr_err("Failed to prepare clk '%s': %d\n", + clks[i].id, ret); + goto err; + } + } + + return 0; + +err: + clk_bulk_unprepare(i, clks); + + return ret; +} +EXPORT_SYMBOL_GPL(clk_bulk_prepare); + +#endif /* CONFIG_HAVE_CLK_PREPARE */ + +/** + * clk_bulk_disable - gate a set of clocks + * @num_clks: the number of clk_bulk_data + * @clks: the clk_bulk_data table being gated + * + * clk_bulk_disable must not sleep, which differentiates it from + * clk_bulk_unprepare. clk_bulk_disable must be called before + * clk_bulk_unprepare. + */ +void clk_bulk_disable(int num_clks, const struct clk_bulk_data *clks) +{ + + while (--num_clks >= 0) + clk_disable(clks[num_clks].clk); +} +EXPORT_SYMBOL_GPL(clk_bulk_disable); + +/** + * clk_bulk_enable - ungate a set of clocks + * @num_clks: the number of clk_bulk_data + * @clks: the clk_bulk_data table being ungated + * + * clk_bulk_enable must not sleep + * Returns 0 on success, -EERROR otherwise. + */ +int __must_check clk_bulk_enable(int num_clks, const struct clk_bulk_data *clks) +{ + int ret; + int i; + + for (i = 0; i < num_clks; i++) { + ret = clk_enable(clks[i].clk); + if (ret) { + pr_err("Failed to enable clk '%s': %d\n", + clks[i].id, ret); + goto err; + } + } + + return 0; + +err: + clk_bulk_disable(i, clks); + + return ret; +} +EXPORT_SYMBOL_GPL(clk_bulk_enable); |