shields: cdc_acm: add support for zephyr,bt-c2h-uart property

Add support for chosen property "zephyr,bt-c2h-uart".

Signed-off-by: Johann Fischer <[email protected]>

Author: jfischer-no

boards/shields/cdc_acm/Kconfig.defconfig

@@ -1,7 +1,7 @@
 # Copyright (c) 2021 Nordic Semiconductor ASA
 # SPDX-License-Identifier: Apache-2.0
 
-if SHIELD_CDC_ACM_CONSOLE || SHIELD_CDC_ACM_SHELL
+if SHIELD_CDC_ACM_CONSOLE || SHIELD_CDC_ACM_SHELL || SHIELD_CDC_ACM_BT_C2H
 
 # TEST_LOGGING_DEFAULTS option sets all log levels to INF,
 # including the USB_CDC_ACM_LOG_LEVEL and that can not work.
@@ -20,7 +20,7 @@ config USB_DEVICE_STACK
 config USB_DEVICE_INITIALIZE_AT_BOOT
 	default y
 
-endif #if SHIELD_CDC_ACM_CONSOLE || SHIELD_CDC_ACM_SHELL
+endif #if SHIELD_CDC_ACM_CONSOLE || SHIELD_CDC_ACM_SHELL || ...
 
 if SHIELD_CDC_ACM_CONSOLE
 

boards/shields/cdc_acm/Kconfig.shield

@@ -6,3 +6,6 @@ config SHIELD_CDC_ACM_CONSOLE
 
 config SHIELD_CDC_ACM_SHELL
 	def_bool $(shields_list_contains,cdc_acm_shell)
+
+config SHIELD_CDC_ACM_BT_C2H
+	def_bool $(shields_list_contains,cdc_acm_bt_c2h)

boards/shields/cdc_acm/cdc_acm_bt_c2h.overlay

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2021 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	chosen {
+		zephyr,bt-c2h-uart = &bt_c2h_cdc_acm_uart0;
+	};
+};
+
+&zephyr_udc0 {
+	bt_c2h_cdc_acm_uart0: bt_c2h_cdc_acm_uart0 {
+		compatible = "zephyr,cdc-acm-uart";
+		label = "BT_C2H_CDC_ACM_0";
+	};
+};

boards/shields/cdc_acm/doc/index.rst

@@ -29,14 +29,16 @@ these specific USB dongles.
 Current supported chosen properties
 ===================================
 
-+-----------------------+---------------------+
-| Chosen property       | Shield Designation  |
-|                       |                     |
-+=======================+=====================+
-| ``zephyr,console``    | ``cdc_acm_console`` |
-+-----------------------+---------------------+
-| ``zephyr,shell-uart`` | ``cdc_acm_shell``   |
-+-----------------------+---------------------+
++------------------------+---------------------+
+| Chosen property        | Shield Designation  |
+|                        |                     |
++========================+=====================+
+| ``zephyr,console``     | ``cdc_acm_console`` |
++------------------------+---------------------+
+| ``zephyr,shell-uart``  | ``cdc_acm_shell``   |
++------------------------+---------------------+
+| ``zephyr,bt-c2h-uart`` | ``cdc_acm_bt_c2h``  |
++------------------------+---------------------+
 
 Requirements
 ************
@@ -62,3 +64,12 @@ Or ``-DSHIELD=cdc_acm_console``, for example:
    :board: nrf52840dongle_nrf52840
    :shield: cdc_acm_console
    :goals: build
+
+With ``-DSHIELD=cdc_acm_bt_c2h``, :ref:`bluetooth-hci-uart-sample` can use
+CDC ACM UART as interface to the host:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/bluetooth/hci_uart
+   :board: nrf52840dongle_nrf52840
+   :shield: cdc_acm_bt_c2h
+   :goals: build