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author | Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> | 2016-07-05 18:23:34 +0200 |
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committer | Stephen Boyd <sboyd@codeaurora.org> | 2016-08-12 18:15:41 -0700 |
commit | 435779fe133626b4e364b320ebc00aac8a0e6047 (patch) | |
tree | 948d13f168f4720437446f3d51a568bff4e3843a | |
parent | 971451b3b15dc6104fad79fbe55ea3995ea9911f (diff) | |
download | linux-stable-435779fe133626b4e364b320ebc00aac8a0e6047.tar.gz linux-stable-435779fe133626b4e364b320ebc00aac8a0e6047.tar.bz2 linux-stable-435779fe133626b4e364b320ebc00aac8a0e6047.zip |
clk: fixed-rate: Convert into a module platform driver
Adds support for fixed-rate clock providers which have not been
enabled via of_clk_init().
This is required by Device trees overlays that introduce clocks
providers.
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
[sboyd@codeaurora.org: Make new private function static, don't
check clk for NULL when unregistering in driver remove]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
-rw-r--r-- | drivers/clk/clk-fixed-rate.c | 71 |
1 files changed, 64 insertions, 7 deletions
diff --git a/drivers/clk/clk-fixed-rate.c b/drivers/clk/clk-fixed-rate.c index 2edb39342a02..c735272ed706 100644 --- a/drivers/clk/clk-fixed-rate.c +++ b/drivers/clk/clk-fixed-rate.c @@ -15,6 +15,7 @@ #include <linux/io.h> #include <linux/err.h> #include <linux/of.h> +#include <linux/platform_device.h> /* * DOC: basic fixed-rate clock that cannot gate @@ -157,18 +158,16 @@ void clk_hw_unregister_fixed_rate(struct clk_hw *hw) EXPORT_SYMBOL_GPL(clk_hw_unregister_fixed_rate); #ifdef CONFIG_OF -/** - * of_fixed_clk_setup() - Setup function for simple fixed rate clock - */ -void of_fixed_clk_setup(struct device_node *node) +static struct clk *_of_fixed_clk_setup(struct device_node *node) { struct clk *clk; const char *clk_name = node->name; u32 rate; u32 accuracy = 0; + int ret; if (of_property_read_u32(node, "clock-frequency", &rate)) - return; + return ERR_PTR(-EIO); of_property_read_u32(node, "clock-accuracy", &accuracy); @@ -176,9 +175,67 @@ void of_fixed_clk_setup(struct device_node *node) clk = clk_register_fixed_rate_with_accuracy(NULL, clk_name, NULL, 0, rate, accuracy); - if (!IS_ERR(clk)) - of_clk_add_provider(node, of_clk_src_simple_get, clk); + if (IS_ERR(clk)) + return clk; + + ret = of_clk_add_provider(node, of_clk_src_simple_get, clk); + if (ret) { + clk_unregister(clk); + return ERR_PTR(ret); + } + + return clk; +} + +/** + * of_fixed_clk_setup() - Setup function for simple fixed rate clock + */ +void of_fixed_clk_setup(struct device_node *node) +{ + _of_fixed_clk_setup(node); } EXPORT_SYMBOL_GPL(of_fixed_clk_setup); CLK_OF_DECLARE(fixed_clk, "fixed-clock", of_fixed_clk_setup); + +static int of_fixed_clk_remove(struct platform_device *pdev) +{ + struct clk *clk = platform_get_drvdata(pdev); + + clk_unregister_fixed_rate(clk); + + return 0; +} + +static int of_fixed_clk_probe(struct platform_device *pdev) +{ + struct clk *clk; + + /* + * This function is not executed when of_fixed_clk_setup + * succeeded. + */ + clk = _of_fixed_clk_setup(pdev->dev.of_node); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + platform_set_drvdata(pdev, clk); + + return 0; +} + +static const struct of_device_id of_fixed_clk_ids[] = { + { .compatible = "fixed-clock" }, + { } +}; +MODULE_DEVICE_TABLE(of, of_fixed_clk_ids); + +static struct platform_driver of_fixed_clk_driver = { + .driver = { + .name = "of_fixed_clk", + .of_match_table = of_fixed_clk_ids, + }, + .probe = of_fixed_clk_probe, + .remove = of_fixed_clk_remove, +}; +builtin_platform_driver(of_fixed_clk_driver); #endif |