[PATCH v5 8/8] clk: fixed-rate: Convert into a module platform driver

Ricardo Ribalda Delgado
2016-07-05T16:24:04Z

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>
---
drivers/clk/clk-fixed-rate.c | 69 +++++++++++++++++++++++++++++++++++++++++---
1 file changed, 65 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/clk-fixed-rate.c b/drivers/clk/clk-fixed-rate.c
index 2edb39342a02..e64ba2315880 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
@@ -160,15 +161,16 @@ EXPORT_SYMBOL_GPL(clk_hw_unregister_fixed_rate);
/**
* of_fixed_clk_setup() - Setup function for simple fixed rate clock
*/
-void of_fixed_clk_setup(struct device_node *node)
+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 +178,68 @@ 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;
+}
+
+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);
+
+ if (clk)
+ 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
--
2.8.1