[PATCH] spi: dw_bt1: fix MUX_MMIO dependencies

[Arnd Bergmann <arnd@kernel.org>]

From: Arnd Bergmann <arnd@arndb.de>

Selecting a symbol with additional dependencies requires
adding the same dependency here:

WARNING: unmet direct dependencies detected for MUX_MMIO
  Depends on [n]: MULTIPLEXER [=y] && OF [=n]
  Selected by [y]:
  - SPI_DW_BT1 [=y] && SPI [=y] && SPI_MASTER [=y] && SPI_DESIGNWARE [=y] && (MIPS_BAIKAL_T1 || COMPILE_TEST [=y])

Alternatively, we could drop this 'select' and require users to manually
put it into their .config as we do for other drivers.

Fixes: 7218838109fe ("spi: dw-bt1: Fix undefined devm_mux_control_get symbol")
Fixes: abf00907538e ("spi: dw: Add Baikal-T1 SPI Controller glue driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/spi/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 3b1c0878bb85..1884e4083088 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -294,6 +294,7 @@ config SPI_DW_MMIO
 config SPI_DW_BT1
 	tristate "Baikal-T1 SPI driver for DW SPI core"
 	depends on MIPS_BAIKAL_T1 || COMPILE_TEST
+	depends on OF
 	select MULTIPLEXER
 	select MUX_MMIO
 	help
-- 
2.35.1