doc: update documentation for AXP192/2101 changes

Migration guide is update to report the changes that has been introduced
in the AXP192/AXP2101 Kconfig symbols, i.e. removal of MFD_AXP192_AXP2101
in favor of MFD_AXP192 and MFD_AXP2101.

Release notes are also updated to notify about the new support for the
power button available on the AXP2101 device.

Signed-off-by: Valerio Setti <[email protected]>

Author: valeriosetti

doc/releases/migration-guide-4.3.rst

@@ -58,6 +58,13 @@ Device Drivers and Devicetree
 
 .. zephyr-keep-sorted-start re(^\w)
 
+MFD
+===
+
+* Driver suppor for AXP2101 has been separated from the AXP192 one. As a consequence the
+  kconfig symbol ``MFD_AXP192_AXP2101`` is removed. :kconfig:option:`MFD_AXP192` is now to be
+  used for AXP192 device while :kconfig:option:`MFD_AXP2101` for the AXP2101 one.
+
 Phy
 ===
 

doc/releases/release-notes-4.3.rst

@@ -222,6 +222,14 @@ New Drivers
 
    * STM32 EXTI interrupt/event controller (:dtcompatible:`st,stm32-exti`) has a dedicated driver and API now, separate from STM32 GPIO Interrupt Control driver.
 
+* MFD
+   * IRQ support has been added for X-Power AXP2101 MFD device. It gets automatically
+     enabled as soon as device-tree property ``int-gpios`` is defined on the device node.
+
+   * Support for the power button found on the X-Power AXP2101 MFD is added and can be enabled
+     via :kconfig:option:`MFD_AXP2101_POWER_BUTTON`. This feature requires interrupt support to
+     be enabled.
+
 * RTC
 
    * STM32 RTC driver has been updated to use the new STM32 EXTI interrupt controller API