i2c: piix4: Register SPDs
The piix4 I2C bus can carry SPDs, register them if present.
Only look on bus 0, as this is where the SPDs seem to be located.
Only the first 8 slots are supported. If the system has more,
then these will not be visible.
The AUX bus can not be probed as on some platforms it reports all
devices present and all reads return "0".
This would allow the ee1004 to be probed incorrectly.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 3e32fb8..a22f912 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -196,6 +196,7 @@
config I2C_PIIX4
tristate "Intel PIIX4 and compatible (ATI/AMD/Serverworks/Broadcom/SMSC)"
depends on PCI && HAS_IOPORT
+ select I2C_SMBUS
help
If you say yes to this option, support will be included for the Intel
PIIX4 family of mainboard I2C interfaces. Specifically, the following
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index 84aa18d..4e32d57 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -29,6 +29,7 @@
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
+#include <linux/i2c-smbus.h>
#include <linux/slab.h>
#include <linux/dmi.h>
#include <linux/acpi.h>
@@ -982,6 +983,14 @@
return retval;
}
+ /*
+ * The AUX bus can not be probed as on some platforms it reports all
+ * devices present and all reads return "0".
+ * This would allow the ee1004 to be probed incorrectly.
+ */
+ if (port == 0)
+ i2c_register_spd(adap);
+
*padap = adap;
return 0;
}
