I2C: OMAP2+: Introduce I2C IP versioning constants

These represent the two kinds of (incompatible) OMAP I2C
peripheral unit in use so far.

The constants are in linux/i2c-omap.h so the omap i2c driver can have
them too.

Cc: patches@linaro.org
Cc: Ben Dooks <ben-linux@fluff.org>
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andy Green <andy.green@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/i2c-omap.h b/include/linux/i2c-omap.h
index 7472449cbb7..701886da76c 100644
--- a/include/linux/i2c-omap.h
+++ b/include/linux/i2c-omap.h
@@ -3,6 +3,18 @@
 
 #include <linux/platform_device.h>
 
+/*
+ * Version 2 of the I2C peripheral unit has a different register
+ * layout and extra registers.  The ID register in the V2 peripheral
+ * unit on the OMAP4430 reports the same ID as the V1 peripheral
+ * unit on the OMAP3530, so we must inform the driver which IP
+ * version we know it is running on from platform / cpu-specific
+ * code using these constants in the hwmod class definition.
+ */
+
+#define OMAP_I2C_IP_VERSION_1 1
+#define OMAP_I2C_IP_VERSION_2 2
+
 struct omap_i2c_bus_platform_data {
         u32             clkrate;
         void            (*set_mpu_wkup_lat)(struct device *dev, long set);