platform/x86: mlx-platform: Add physical bus number auto detection

mlx-platform does not provide a bus number to i2c-mlxcpld, assuming it
is always one. On some x86 systems, other i2c drivers may probe before
i2c-mlxcpld, causing bus one to be busy.

Make mlx-platform determine which adapter number is free prior to
activating i2c-mlxpld, adjusting the mux base numbers accordingly.
Update the mlxreg-hotplug pdata similarly.

This adds an explicit mlx-platform build dependency on I2C, update the
Kconfig accordingly. Add the missing REGMAP dependency while we're at
it.

Signed-off-by: Vadim Pasternak <vadimp@mellanox.com>
[dvhart: Rewrite commit message more concisely]
[dvhart: Add build dependencies]
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/platform_data/mlxreg.h b/include/linux/platform_data/mlxreg.h
index 262910967476..2744cff1b297 100644
--- a/include/linux/platform_data/mlxreg.h
+++ b/include/linux/platform_data/mlxreg.h
@@ -130,6 +130,7 @@ struct mlxreg_core_platform_data {
  * @cell_low: location of low aggregation interrupt register;
  * @mask_low: low aggregation interrupt common mask;
  * @deferred_nr: I2C adapter number must be exist prior probing execution;
+ * @shift_nr: I2C adapter numbers must be incremented by this value;
  */
 struct mlxreg_core_hotplug_platform_data {
         struct mlxreg_core_item *items;
@@ -141,6 +142,7 @@ struct mlxreg_core_hotplug_platform_data {
         u32 cell_low;
         u32 mask_low;
         int deferred_nr;
+        int shift_nr;
 };
 
 #endif /* __LINUX_PLATFORM_DATA_MLXREG_H */