ARM: OSIRIS: DVS (Dynamic Voltage Scaling) supoort.

Add a driver to provide DVS for the Simtec Osiris module to reduce
the power consumption whilst idling.

The DVS driver alters the voltage supplied to the ARM core depending
on the frequency it is running at. The driver itself does not do any
of the frequency alteration, which is left up to the cpufreq driver.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Simtec Linux Team <linux@simtec.co.uk>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2440/mach-osiris.c b/arch/arm/mach-s3c2440/mach-osiris.c
index 2105a41281a4..8af9e9a104a5 100644
--- a/arch/arm/mach-s3c2440/mach-osiris.c
+++ b/arch/arm/mach-s3c2440/mach-osiris.c
@@ -23,6 +23,8 @@
 #include <linux/i2c.h>
 #include <linux/io.h>
 
+#include <linux/i2c/tps65010.h>
+
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
 #include <asm/mach/irq.h>
@@ -326,12 +328,44 @@ static struct sys_device osiris_pm_sysdev = {
         .cls            = &osiris_pm_sysclass,
 };
 
+/* Link for DVS driver to TPS65011 */
+
+static void osiris_tps_release(struct device *dev)
+{
+        /* static device, do not need to release anything */
+}
+
+static struct platform_device osiris_tps_device = {
+        .name   = "osiris-dvs",
+        .id     = -1,
+        .dev.release = osiris_tps_release,
+};
+
+static int osiris_tps_setup(struct i2c_client *client, void *context)
+{
+        osiris_tps_device.dev.parent = &client->dev;
+        return platform_device_register(&osiris_tps_device);
+}
+
+static int osiris_tps_remove(struct i2c_client *client, void *context)
+{
+        platform_device_unregister(&osiris_tps_device);
+        return 0;
+}
+
+static struct tps65010_board osiris_tps_board = {
+        .base           = -1,   /* GPIO can go anywhere at the moment */
+        .setup          = osiris_tps_setup,
+        .teardown       = osiris_tps_remove,
+};
+
 /* I2C devices fitted. */
 
 static struct i2c_board_info osiris_i2c_devs[] __initdata = {
         {
                 I2C_BOARD_INFO("tps65011", 0x48),
                 .irq    = IRQ_EINT20,
+                .platform_data = &osiris_tps_board,
         },
 };