platform/x86: mlx-platform: Add deffered bus functionality

mlx-platform activates i2c-mux-reg, which creates buses needed by
mlxreg-hotplug. If the mlxreg-hotplug probe runs before the i2c-mux-reg
probe completes, it may attempt to connect a device to an adapter number
that has not been created yet, and fail.

Make mlx-platform driver record the highest bus number in mlxreg-hotplug
platform data and defer mlxreg-hotplug probe until all the buses are
created.

Signed-off-by: Vadim Pasternak <vadimp@mellanox.com>
[dvhart: rewrite commit message more concisely]
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 fcdc707eab99..262910967476 100644
--- a/include/linux/platform_data/mlxreg.h
+++ b/include/linux/platform_data/mlxreg.h
@@ -129,6 +129,7 @@ struct mlxreg_core_platform_data {
  * @mask: top aggregation interrupt common mask;
  * @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;
  */
 struct mlxreg_core_hotplug_platform_data {
         struct mlxreg_core_item *items;
@@ -139,6 +140,7 @@ struct mlxreg_core_hotplug_platform_data {
         u32 mask;
         u32 cell_low;
         u32 mask_low;
+        int deferred_nr;
 };
 
 #endif /* __LINUX_PLATFORM_DATA_MLXREG_H */