i3c: imx3112: Add driver for Renesas IMX3112 mux

This change adds the driver for the Renesas IMX3112
2:1 bus multiplexer. It also adds dt-bindings for generic
i3c-muxes, and Kconfig priorities to make sure the init order is:
1. bus controller
2. mux
3. channel

Signed-off-by: Ramiro de Rojas Perez <[email protected]>

drivers/i3c/CMakeLists.txt

@@ -28,3 +28,8 @@ zephyr_library_sources_ifdef(
   CONFIG_I3C_CADENCE
   i3c_cdns.c
 )
+
+zephyr_library_sources_ifdef(
+  CONFIG_I3C_RENESAS_IMX3112
+  i3c_renesas_imx3112.c
+)

drivers/i3c/Kconfig

@@ -100,5 +100,6 @@ comment "Device Drivers"
 
 rsource "Kconfig.nxp"
 rsource "Kconfig.cdns"
+rsource "Kconfig.renesas"
 
 endif # I3C

drivers/i3c/Kconfig.renesas

@@ -0,0 +1,28 @@
+# Copyright (c) 2022 Google LLC
+# SPDX-License-Identifier: Apache-2.0
+
+config I3C_RENESAS_MUX_PRIORITY
+	int "I3C Renesas Mux Init Priority"
+	# Default is just after I3C_CONTROLLER_INIT_PRIORITY
+	default 51
+	help
+	  This is used for setting up an I3C renesas mux, by configuring
+	  the electrical parameters and doing device discovery.
+
+	  Note that this needs to be done before the device driver
+	  instances of the connected I3C devices start
+	  initializing those devices, but after the bus controller finishes
+	  initialization
+
+config I3C_RENESAS_CHANNEL_PRIORITY
+	int "I3C Renesas Mux Init Priority"
+	# Default is just after I3C_RENESAS_MUX_PRIORITY
+	default 52
+	help
+	  This is used for setting up an I3C renesas mux channels by
+	  doing device discovery in each channel
+
+config I3C_RENESAS_IMX3112
+	bool "Renesas I3C 2:1 bus multiplexer imx3112"
+	help
+	   Enable the renesas imx3112 mux