We see the following link error with CONFIG_BT_HCIUART=y,
CONFIG_BT_HCIUART_LL=y and CONFIG_SERIAL_DEV_BUS=m:

drivers/built-in.o: In function 'll_close':
supp.c:(.text+0x55add4): undefined reference to 'serdev_device_close'
supp.c:(.text+0x55add4): relocation truncated to fit: R_AARCH64_CALL26 against 
undefined symbol 'serdev_device_close'
drivers/built-in.o: In function 'll_open':
supp.c:(.text+0x55aed0): undefined reference to 'serdev_device_open'
supp.c:(.text+0x55aed0): relocation truncated to fit: R_AARCH64_CALL26 against 
undefined symbol 'serdev_device_open'
drivers/built-in.o: In function `hci_ti_probe':
supp.c:(.text+0x55b00c): undefined reference to 'hci_uart_register_device'
supp.c:(.text+0x55b00c): relocation truncated to fit: R_AARCH64_CALL26 against 
undefined symbol 'hci_uart_register_device'
drivers/built-in.o: In function `ll_setup':
supp.c:(.text+0x55b08c): undefined reference to 'serdev_device_set_flow_control'
supp.c:(.text+0x55b08c): relocation truncated to fit: R_AARCH64_CALL26 against 
undefined symbol 'serdev_device_set_flow_control'
supp.c:(.text+0x55b324): undefined reference to 'serdev_device_set_baudrate'
supp.c:(.text+0x55b324): relocation truncated to fit: R_AARCH64_CALL26 against 
undefined symbol 'serdev_device_set_baudrate'
drivers/built-in.o: In function 'll_init':
supp.c:(.init.text+0x1b508): undefined reference to 
'__serdev_device_driver_register'
supp.c:(.init.text+0x1b508): relocation truncated to fit: R_AARCH64_CALL26 
against undefined symbol '__serdev_device_driver_register'

Fix this by dependig BT_HCIUART_LL on the BT_HCIUART_SERDEV symbol.
This implies a dependency on BT_HCIUART and hci_ll.c is only compiled in
if SERIAl_DEV_BUS is built in or SERIAL_DEV_BUS and BT_HCIUART are
modules.

Fixes: 371805522f87 ("bluetooth: hci_uart: add LL protocol serdev driver 
support")
Signed-off-by: Tobias Regnery <[email protected]>
---
Hi,

I'm not sure if this is the right fix because the dependencies are quite
complicated but at least the build failure goes away with this change.

 drivers/bluetooth/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 737d93ef27c5..e5fd24d90b0a 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -131,7 +131,7 @@ config BT_HCIUART_ATH3K
 
 config BT_HCIUART_LL
        bool "HCILL protocol support"
-       depends on BT_HCIUART
+       depends on BT_HCIUART_SERDEV
        help
          HCILL (HCI Low Level) is a serial protocol for communication
          between Bluetooth device and host. This protocol is required for
-- 
2.11.0

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