clk: ux500: Initial support for abx500 clock driver

The abx500 clock driver is a platform driver which will be initialized
during arch init. The platform device shall be added from the ab-core
driver as a mfd child device to maintain correct boot sequence.

Depending on what ab version we use, different clock definitions will
be added.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

2 files changed, 76 insertions, 0 deletions

diff --git a/drivers/clk/ux500/Makefile b/drivers/clk/ux500/Makefile
index 858fbfe66281..bcc0c11a507c 100644
--- a/drivers/clk/ux500/Makefile
+++ b/drivers/clk/ux500/Makefile
@@ -10,3 +10,6 @@ obj-y += clk-prcmu.o
 obj-y += u8500_clk.o
 obj-y += u9540_clk.o
 obj-y += u8540_clk.o
+
+# ABX500 clock driver
+obj-y += abx500-clk.o
diff --git a/drivers/clk/ux500/abx500-clk.c b/drivers/clk/ux500/abx500-clk.c
new file mode 100644
index 000000000000..e27c52317ffe
--- /dev/null
+++ b/drivers/clk/ux500/abx500-clk.c
@@ -0,0 +1,73 @@
+/*
+ * abx500 clock implementation for ux500 platform.
+ *
+ * Copyright (C) 2012 ST-Ericsson SA
+ * Author: Ulf Hansson <ulf.hansson@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/abx500/ab8500.h>
+
+/* TODO: Add clock implementations here */
+
+
+/* Clock definitions for ab8500 */
+static int ab8500_reg_clks(struct device *dev)
+{
+        return 0;
+}
+
+/* Clock definitions for ab8540 */
+static int ab8540_reg_clks(struct device *dev)
+{
+        return 0;
+}
+
+/* Clock definitions for ab9540 */
+static int ab9540_reg_clks(struct device *dev)
+{
+        return 0;
+}
+
+static int __devinit abx500_clk_probe(struct platform_device *pdev)
+{
+        struct ab8500 *parent = dev_get_drvdata(pdev->dev.parent);
+        int ret;
+
+        if (is_ab8500(parent) || is_ab8505(parent)) {
+                ret = ab8500_reg_clks(&pdev->dev);
+        } else if (is_ab8540(parent)) {
+                ret = ab8540_reg_clks(&pdev->dev);
+        } else if (is_ab9540(parent)) {
+                ret = ab9540_reg_clks(&pdev->dev);
+        } else {
+                dev_err(&pdev->dev, "non supported plf id\n");
+                return -ENODEV;
+        }
+
+        return ret;
+}
+
+static struct platform_driver abx500_clk_driver = {
+        .driver = {
+                .name = "abx500-clk",
+                .owner = THIS_MODULE,
+        },
+        .probe  = abx500_clk_probe,
+};
+
+static int __init abx500_clk_init(void)
+{
+        return platform_driver_register(&abx500_clk_driver);
+}
+
+arch_initcall(abx500_clk_init);
+
+MODULE_AUTHOR("Ulf Hansson <ulf.hansson@linaro.org");
+MODULE_DESCRIPTION("ABX500 clk driver");
+MODULE_LICENSE("GPL v2");