[PATCH] firmware: thead: add CONFIG_MAILBOX dependency

[Arnd Bergmann]

From: Arnd Bergmann <arnd@xxxxxxxx>

Without this, the driver fails to build:

ld: drivers/firmware/thead,th1520-aon.o: in function `th1520_aon_call_rpc':
thead,th1520-aon.c:(.text+0x28): undefined reference to `mbox_send_message'
ld: drivers/firmware/thead,th1520-aon.o: in function `th1520_aon_deinit':
thead,th1520-aon.c:(.text+0x17e): undefined reference to `mbox_free_channel'
ld: drivers/firmware/thead,th1520-aon.o: in function `th1520_aon_init':
thead,th1520-aon.c:(.text+0x1d9): undefined reference to `mbox_request_channel_byname'

Fixes: e4b3cbd840e5 ("firmware: thead: Add AON firmware protocol driver")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 drivers/firmware/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 42e3dd1c387a..6ab9f7ca7ff1 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -239,6 +239,7 @@ config SYSFB_SIMPLEFB
 config TH1520_AON_PROTOCOL
 	tristate "Always-On firmware protocol"
 	depends on ARCH_THEAD || COMPILE_TEST
+	depends on MAILBOX
 	help
 	  Power, clock, and resource management capabilities on the TH1520 SoC are
 	  managed by the E902 core. Firmware running on this core communicates with
-- 
2.39.5