drivers: can: mcux: flexcan: use proper namespace for Kconfig symbols

Use proper namespace for the MCUX FlexCAN Kconfig symbols, renaming
CONFIG_CAN_MAX_FILTER to CONFIG_CAN_MCUX_FLEXCAN_MAX_FILTERS and
CONFIG_CAN_MAX_MB to CONFIG_CAN_MCUX_FLEXCAN_MAX_MB.

This prevents Kconfig symbol clashes between different CAN controller
drivers.

Signed-off-by: Henrik Brix Andersen <henrik@brixandersen.dk>

Author: henrikbrixandersen

boards/nxp/mr_canhubk3/doc/index.rst

@@ -143,11 +143,11 @@ flexcan5         | PTC11  | PTC11_CAN0_RX  P22/P23
    and support maximum 32 message buffers for concurrent active instances with 8 bytes
    payload. We need to pay attention to configuration options:
 
-   1. :kconfig:option:`CONFIG_CAN_MAX_MB` must be less or equal than the
+   1. :kconfig:option:`CONFIG_CAN_MCUX_FLEXCAN_MAX_MB` must be less or equal than the
       maximum number of message buffers that is according to the table below.
 
-   2. :kconfig:option:`CONFIG_CAN_MAX_FILTER` must be less or equal than
-      :kconfig:option:`CONFIG_CAN_MAX_MB`.
+   2. :kconfig:option:`CONFIG_CAN_MCUX_FLEXCAN_MAX_FILTERS` must be less or equal than
+      :kconfig:option:`CONFIG_CAN_MCUX_FLEXCAN_MAX_MB`.
 
 ===============  ==========  ================  ================
 Devicetree node  Payload     Hardware support  Software support

drivers/can/Kconfig.mcux

@@ -28,7 +28,7 @@ config CAN_MCUX_FLEXCAN_WAIT_TIMEOUT
 	  Maximum number of wait loop iterations for the MCUX FlexCAN HAL when entering/leaving
 	  freeze mode.
 
-config CAN_MAX_MB
+config CAN_MCUX_FLEXCAN_MAX_MB
 	int "Maximum number of message buffers for concurrent active instances"
 	default 16
 	depends on SOC_SERIES_S32K3 || SOC_SERIES_S32K1 || SOC_SERIES_S32ZE
@@ -39,7 +39,7 @@ config CAN_MAX_MB
 	help
 	  Defines maximum number of message buffers for concurrent active instances.
 
-config CAN_MAX_FILTER
+config CAN_MCUX_FLEXCAN_MAX_FILTERS
 	int "Maximum number of concurrent active RX filters"
 	default 5
 	range 1 15 if SOC_SERIES_KINETIS_KE1XF || SOC_SERIES_KINETIS_K6X

drivers/can/can_mcux_flexcan.c

@@ -34,8 +34,8 @@ LOG_MODULE_REGISTER(can_mcux_flexcan, CONFIG_CAN_LOG_LEVEL);
 #endif
 
 /* The maximum number of message buffers for concurrent active instances */
-#ifdef CONFIG_CAN_MAX_MB
-#define MCUX_FLEXCAN_MAX_MB CONFIG_CAN_MAX_MB
+#ifdef CONFIG_CAN_MCUX_FLEXCAN_MAX_MB
+#define MCUX_FLEXCAN_MAX_MB CONFIG_CAN_MCUX_FLEXCAN_MAX_MB
 #else
 #define MCUX_FLEXCAN_MAX_MB FSL_FEATURE_FLEXCAN_HAS_MESSAGE_BUFFER_MAX_NUMBERn(0)
 #endif
@@ -44,7 +44,7 @@ LOG_MODULE_REGISTER(can_mcux_flexcan, CONFIG_CAN_LOG_LEVEL);
  * RX message buffers (filters) will take up the first N message
  * buffers. The rest are available for TX use.
  */
-#define MCUX_FLEXCAN_MAX_RX (CONFIG_CAN_MAX_FILTER + RX_START_IDX)
+#define MCUX_FLEXCAN_MAX_RX (CONFIG_CAN_MCUX_FLEXCAN_MAX_FILTERS + RX_START_IDX)
 #define MCUX_FLEXCAN_MAX_TX (MCUX_FLEXCAN_MAX_MB - MCUX_FLEXCAN_MAX_RX)
 
 /*
@@ -144,7 +144,7 @@ static int mcux_flexcan_get_max_filters(const struct device *dev, bool ide)
 {
 	ARG_UNUSED(ide);
 
-	return CONFIG_CAN_MAX_FILTER;
+	return CONFIG_CAN_MCUX_FLEXCAN_MAX_FILTERS;
 }
 
 static int mcux_flexcan_set_timing(const struct device *dev,