[PATCH] ppc64: SMU driver update & i2c support

The SMU is the "system controller" chip used by Apple recent G5 machines
including the iMac G5.  It drives things like fans, i2c busses, real time
clock, etc...

The current kernel contains a very crude driver that doesn't do much more
than reading the real time clock synchronously.  This is a completely
rewritten driver that provides interrupt based command queuing, a userland
interface, and an i2c/smbus driver for accessing the devices hanging off
the SMU i2c busses like temperature sensors.  This driver is a basic block
for upcoming work on thermal control for those machines, among others.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 8334496a7e0a..3badfec75b1c 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -245,6 +245,18 @@ config I2C_KEYWEST
           This support is also available as a module.  If so, the module 
           will be called i2c-keywest.
 
+config I2C_PMAC_SMU
+        tristate "Powermac SMU I2C interface"
+        depends on I2C && PMAC_SMU
+        help
+          This supports the use of the I2C interface in the SMU
+          chip on recent Apple machines like the iMac G5.  It is used
+          among others by the thermal control driver for those machines.
+          Say Y if you have such a machine.
+
+          This support is also available as a module.  If so, the module
+          will be called i2c-pmac-smu.
+
 config I2C_MPC
         tristate "MPC107/824x/85xx/52xx"
         depends on I2C && PPC32