drivers: i3c: add i3c controller and target kconfigs

I3C can contain a lot of features that may be unused. Add Kconfigs for
enabling controller and/or target code. Choosing just one can reduce
the code size footprint.

Signed-off-by: Ryan McClelland <ryanmcclelland@meta.com>

Author: XenuIsWatching

drivers/i3c/CMakeLists.txt

@@ -5,17 +5,14 @@
 zephyr_syscall_header(${ZEPHYR_BASE}/include/zephyr/drivers/i3c.h)
 
 zephyr_library()
+zephyr_library_sources_ifdef(CONFIG_I3C_CONTROLLER i3c_ccc.c)
+zephyr_library_sources_ifdef(CONFIG_I3C_CONTROLLER i3c_common.c)
 
-zephyr_library_sources(
-  i3c_ccc.c
-  i3c_common.c
-)
-
-if(CONFIG_I3C_NUM_OF_DESC_MEM_SLABS GREATER 0)
+if(DEFINED CONFIG_I3C_NUM_OF_DESC_MEM_SLABS AND CONFIG_I3C_NUM_OF_DESC_MEM_SLABS GREATER 0)
   zephyr_library_sources(i3c_mem_slab.c)
 endif()
 
-if(CONFIG_I3C_I2C_NUM_OF_DESC_MEM_SLABS GREATER 0)
+if(DEFINED CONFIG_I3C_I2C_NUM_OF_DESC_MEM_SLABS AND CONFIG_I3C_I2C_NUM_OF_DESC_MEM_SLABS GREATER 0)
   zephyr_library_sources(i3c_i2c_mem_slab.c)
 endif()
 

drivers/i3c/Kconfig

@@ -15,6 +15,34 @@ module = I3C
 module-str = i3c
 source "subsys/logging/Kconfig.template.log_config"
 
+choice I3C_MODE
+	prompt "I3C Mode Selection"
+	default I3C_DUAL_ROLE
+	help
+	  Select the role in which I3C is enabled.
+	  At least one of Controller or Target must be enabled.
+
+	  Selecting only one can reduce the code footprint size.
+
+config I3C_CONTROLLER_ROLE_ONLY
+	bool "I3C Controller only"
+
+config I3C_TARGET_ROLE_ONLY
+	bool "I3C Target only"
+
+config I3C_DUAL_ROLE
+	bool "Both I3C Controller and Target"
+
+endchoice
+
+config I3C_CONTROLLER
+	bool
+	default y if I3C_DUAL_ROLE || I3C_CONTROLLER_ROLE_ONLY
+
+config I3C_TARGET
+	bool
+	default y if I3C_DUAL_ROLE || I3C_TARGET_ROLE_ONLY
+
 config I3C_SHELL
 	bool "I3C Shell"
 	depends on SHELL
@@ -26,6 +54,7 @@ config I3C_SHELL
 
 config I3C_TARGET_BUFFER_MODE
 	bool "I3C target driver for buffer mode"
+	depends on I3C_TARGET
 	help
 	  This is an option to enable buffer mode.
 
@@ -108,6 +137,8 @@ config I3C_INIT_RSTACT
 	  This determines whether the bus initialization routine
 	  sends a reset action command to I3C targets.
 
+if I3C_CONTROLLER && I3C_TARGET
+
 config I3C_NUM_OF_DESC_MEM_SLABS
 	int "Number of I3C Device Descriptors Mem Slabs"
 	default 3
@@ -124,6 +155,10 @@ config I3C_I2C_NUM_OF_DESC_MEM_SLABS
 	  there is a device encounted through DEFTGTS that is not
 	  within known I2C devices.
 
+endif # I3C_CONTROLLER && I3C_TARGET
+
+if I3C_CONTROLLER
+
 config I3C_RTIO
 	bool "I3C RTIO API"
 	select EXPERIMENTAL
@@ -168,6 +203,8 @@ config I3C_RTIO_FALLBACK_MSGS
 
 endif # I3C_RTIO
 
+endif # I3C_CONTROLLER
+
 comment "Device Drivers"
 
 rsource "Kconfig.nxp"

drivers/i3c/Kconfig.cdns

@@ -8,7 +8,7 @@ source "subsys/logging/Kconfig.template.log_config"
 
 config I3C_CADENCE
 	bool "Cadence I3C driver"
-	select I3C_IBI_WORKQUEUE if I3C_USE_IBI
+	select I3C_IBI_WORKQUEUE if I3C_USE_IBI && I3C_CONTROLLER
 	depends on DT_HAS_CDNS_I3C_ENABLED
 	default y
 	help

drivers/i3c/Kconfig.dw

@@ -8,7 +8,7 @@ source "subsys/logging/Kconfig.template.log_config"
 
 menuconfig I3C_DW
 	bool "DW I3C support"
-	select I3C_IBI_WORKQUEUE if I3C_USE_IBI
+	select I3C_IBI_WORKQUEUE if I3C_USE_IBI && I3C_CONTROLLER
 	depends on DT_HAS_SNPS_DESIGNWARE_I3C_ENABLED
 	depends on CLOCK_CONTROL
 	default y