From abe252ae2cadba1c8eafb00e02b318993b22f0c2 Mon Sep 17 00:00:00 2001
From: Teknoman117 <linux.robotdude@gmail.com>
Date: Wed, 24 Jul 2013 02:57:08 -0700
Subject: [PATCH 1/4] Added the Texas Instruments OMAP Clock driver originally
 found here: http://lkml.indiana.edu/hypermail/linux/kernel/1304.1/04079.html

---
 drivers/clk/Makefile      |   1 +
 drivers/clk/omap/Makefile |   1 +
 drivers/clk/omap/clk.c    | 100 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 102 insertions(+)
 create mode 100644 drivers/clk/omap/Makefile
 create mode 100644 drivers/clk/omap/clk.c

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 7b11106..e6a0195 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_ARCH_U8500)	+= ux500/
 obj-$(CONFIG_ARCH_VT8500)	+= clk-vt8500.o
 obj-$(CONFIG_ARCH_ZYNQ)		+= zynq/
 obj-$(CONFIG_ARCH_TEGRA)	+= tegra/
+obj-$(CONFIG_ARCH_OMAP)		+= omap/
 obj-$(CONFIG_PLAT_SAMSUNG)	+= samsung/
 
 obj-$(CONFIG_X86)		+= x86/
diff --git a/drivers/clk/omap/Makefile b/drivers/clk/omap/Makefile
new file mode 100644
index 0000000..0303c0b
--- /dev/null
+++ b/drivers/clk/omap/Makefile
@@ -0,0 +1 @@
+obj-y += clk.o
diff --git a/drivers/clk/omap/clk.c b/drivers/clk/omap/clk.c
new file mode 100644
index 0000000..f7f432d
--- /dev/null
+++ b/drivers/clk/omap/clk.c
@@ -0,0 +1,100 @@
+/*
+ * Texas Instruments OMAP Clock driver
+ *
+ * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
+ * Nishanth Menon <nm@xxxxxx>
+ * Tony Lindgren <tony@xxxxxxxxxxx>
+ *
+ * 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.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/string.h>
+
+static const struct of_device_id omap_clk_of_match[] = {
+    {.compatible = "ti,omap-clock",},
+    {},
+};
+
+/**
+ * omap_clk_src_get() - Get OMAP clock from node name when needed
+ * @clkspec: clkspec argument
+ * @data: unused
+ *
+ * REVISIT: We assume the following:
+ * 1. omap clock names end with _ck
+ * 2. omap clock names are under 32 characters in length
+ */
+static struct clk *omap_clk_src_get(struct of_phandle_args *clkspec, void *data)
+{
+    struct clk *clk;
+    char clk_name[32];
+    struct device_node *np = clkspec->np;
+
+    /* Set up things so consumer can call clk_get() with name */
+    snprintf(clk_name, 32, "%s_ck", np->name);
+    clk = clk_get(NULL, clk_name);
+    if (IS_ERR(clk))
+    {
+        pr_err("%s: could not get clock %s(%ld)\n", __func__,
+        clk_name, PTR_ERR(clk));
+        goto out;
+    }
+    clk_put(clk);
+
+out:
+    return clk;
+}
+
+/**
+ * omap_clk_probe() - create link from DT definition to clock data
+ * @pdev: device node
+ *
+ * NOTE: We assume that omap clocks are not removed.
+ */
+static int omap_clk_probe(struct platform_device *pdev)
+{
+    int res;
+    struct device_node *np = pdev->dev.of_node;
+
+    /* This allows the driver to of_clk_get() */
+    res = of_clk_add_provider(np, omap_clk_src_get, NULL);
+    if (res)
+        dev_err(&pdev->dev, "could not add provider(%d)\n", res);
+
+    return res;
+}
+
+/* We assume here that OMAP clocks will not be removed */
+static struct platform_driver omap_clk_driver =
+{
+    .probe = omap_clk_probe,
+    .driver =
+    {
+        .name = "omap_clk",
+        .of_match_table = of_match_ptr(omap_clk_of_match),
+    },
+};
+
+static int __init omap_clk_init(void)
+{
+    return platform_driver_register(&omap_clk_driver);
+}
+
+arch_initcall(omap_clk_init);
+
+MODULE_DESCRIPTION("OMAP Clock driver");
+MODULE_AUTHOR("Texas Instruments Inc.");
+MODULE_LICENSE("GPL v2");
-- 
1.8.4.rc3