[PATCH] clk: add generic driver for fixed rate clock

[Stefan Kristiansson]

This adds a simple driver with the only purpose to initialise
the fixed rate clock.
This is useful for systems that do not wish to use seperate init
code for the fixed rate clock init, but rather only rely on a
device tree description of it.

Signed-off-by: Stefan Kristiansson <stefan.kristiansson@xxxxxxxxxxxxx>
---
 drivers/clk/Kconfig             |  8 ++++++
 drivers/clk/Makefile            |  1 +
 drivers/clk/clk-generic-fixed.c | 59 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+)
 create mode 100644 drivers/clk/clk-generic-fixed.c

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 51380d6..7c8ea78 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -87,6 +87,14 @@ config CLK_PPC_CORENET
 	  This adds the clock driver support for Freescale PowerPC corenet
 	  platforms using common clock framework.
 
+config COMMON_CLK_GENERIC_FIXED
+	tristate "Generic fixed rate clock driver"
+	depends on OF
+	---help---
+	  Driver for systems that do not want to register their fixed rate
+	  clocks through init code, but rather through the device tree
+	  description.
+
 endmenu
 
 source "drivers/clk/mvebu/Kconfig"
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 4038c2b..2d46647 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_COMMON_CLK)	+= clk-fixed-rate.o
 obj-$(CONFIG_COMMON_CLK)	+= clk-gate.o
 obj-$(CONFIG_COMMON_CLK)	+= clk-mux.o
 obj-$(CONFIG_COMMON_CLK)	+= clk-composite.o
+obj-$(CONFIG_COMMON_CLK_GENERIC_FIXED) += clk-generic-fixed.o
 
 # SoCs specific
 obj-$(CONFIG_ARCH_BCM2835)	+= clk-bcm2835.o
diff --git a/drivers/clk/clk-generic-fixed.c b/drivers/clk/clk-generic-fixed.c
new file mode 100644
index 0000000..85df8a8
--- /dev/null
+++ b/drivers/clk/clk-generic-fixed.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2013 Stefan Kristiansson <stefan.kristiansson@xxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Generic driver for fixed rate clock
+ */
+#include <linux/platform_device.h>
+#include <linux/clk-provider.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/module.h>
+
+static const struct of_device_id generic_fixed_clk_match[] __initconst = {
+	{ .compatible = "fixed-clock",},
+	{}
+};
+
+static int generic_fixed_clk_probe(struct platform_device *pdev)
+{
+	of_fixed_clk_setup(pdev->dev.of_node);
+
+	return 0;
+}
+
+static int generic_fixed_clk_remove(struct platform_device *pdev)
+{
+	of_clk_del_provider(pdev->dev.of_node);
+
+	return 0;
+}
+
+static struct platform_driver generic_fixed_clk_driver = {
+	.driver = {
+		.name = "generic-fixed-clk",
+		.owner = THIS_MODULE,
+		.of_match_table = generic_fixed_clk_match,
+	},
+	.probe	= generic_fixed_clk_probe,
+	.remove	= generic_fixed_clk_remove,
+};
+
+static int __init generic_fixed_clk_init(void)
+{
+	return platform_driver_register(&generic_fixed_clk_driver);
+}
+subsys_initcall(generic_fixed_clk_init);
+
+static void __exit generic_fixed_exit(void)
+{
+	platform_driver_unregister(&generic_fixed_clk_driver);
+}
+module_exit(generic_fixed_exit);
+
+MODULE_AUTHOR("Stefan Kristiansson <stefan.kristiansson@xxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Generic driver for fixed rate clock");
+MODULE_LICENSE("GPL v2");
-- 
1.8.1.2

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