[PATCH] mtd: atmel-quadspi: disallow building on ebsa110

From: Arnd Bergmann
Date: Mon Dec 10 2018 - 15:38:16 EST

I ran into a link-time error with the atmel-quadspi driver on the
EBSA110 platform:

drivers/mtd/built-in.o: In function `atmel_qspi_run_command':
:(.text+0x1ee3c): undefined reference to `_memcpy_toio'
:(.text+0x1ee48): undefined reference to `_memcpy_fromio'

The problem is that _memcpy_toio/_memcpy_fromio are not available on
that platform, and we have to prevent building the driver there.

In case we want to backport this to older kernels: between linux-4.8
and linux-4.20, the Kconfig entry was in drivers/mtd/spi-nor/Kconfig
but had the same problem.

Link: https://lore.kernel.org/patchwork/patch/812860/
Fixes: 161aaab8a067 ("mtd: atmel-quadspi: add driver for Atmel QSPI controller")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
drivers/spi/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index ca68ac63c6c3..3135f80ec853 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -93,7 +93,7 @@ config SPI_AT91_USART

tristate "Atmel Quad SPI Controller"
- depends on ARCH_AT91 || (ARM && COMPILE_TEST)
+ depends on ARCH_AT91 || (ARM && COMPILE_TEST && !ARCH_EBSA110)
depends on OF && HAS_IOMEM
This enables support for the Quad SPI controller in master mode.