mgmt: ec_host_cmd: add buffer alignment config

Add a new config to specify an alignment for the buffers defined by the
ec_host_cmd handler.

Signed-off-by: Dawid Niedzwiecki <[email protected]>

Author: niedzwiecki-dawid

subsys/mgmt/ec_host_cmd/Kconfig

@@ -47,6 +47,13 @@ config EC_HOST_CMD_HANDLER_RX_BUFFER_SIZE
 	  avoid duplicating buffers. If multiple backends are used, the size has to be
 	  set by user to the largest one.
 
+config EC_HOST_CMD_HANDLER_BUFFER_ALIGN
+	int "Memory alignment for the tx/rx buffers"
+	default 4
+	help
+	  Some interfaces need a special memory alignment to work properly. Use that config
+	  to specify the alignment.
+
 config EC_HOST_CMD_HANDLER_PRIO
 	int "Priority of host command task"
 	default 13

subsys/mgmt/ec_host_cmd/ec_host_cmd_handler.c

@@ -40,10 +40,12 @@ BUILD_ASSERT(NUMBER_OF_CHOSEN_BACKENDS < 2, "Number of chosen backends > 1");
 #endif
 
 COND_CODE_1(CONFIG_EC_HOST_CMD_HANDLER_RX_BUFFER_DEF,
-	    (static uint8_t hc_rx_buffer[CONFIG_EC_HOST_CMD_HANDLER_RX_BUFFER_SIZE] __aligned(4)
+	    (static uint8_t hc_rx_buffer[CONFIG_EC_HOST_CMD_HANDLER_RX_BUFFER_SIZE]
+	    __aligned(CONFIG_EC_HOST_CMD_HANDLER_BUFFER_ALIGN)
 	    BUFFERS_CACHE_ATTR;), ())
 COND_CODE_1(CONFIG_EC_HOST_CMD_HANDLER_TX_BUFFER_DEF,
-	    (static uint8_t hc_tx_buffer[CONFIG_EC_HOST_CMD_HANDLER_TX_BUFFER_SIZE] __aligned(4)
+	    (static uint8_t hc_tx_buffer[CONFIG_EC_HOST_CMD_HANDLER_TX_BUFFER_SIZE]
+	    __aligned(CONFIG_EC_HOST_CMD_HANDLER_BUFFER_ALIGN)
 	    BUFFERS_CACHE_ATTR;), ())
 
 #ifdef CONFIG_EC_HOST_CMD_DEDICATED_THREAD