[PATCH] spi: cadence-xspi: Add COMPILE_TEST support

[Rosen Penev <rosenp@gmail.com>]

The Cadence XSPI driver uses readq() and writeq(), which are not provided
directly by all 32-bit architectures. Include the generic non-atomic 64-bit
I/O accessor fallback for non-64-bit builds so the driver can build there.

Drop the 64BIT dependency at the same time. The driver only needs MMIO
and the SPI memory interface at build time, and the fallback accessors
cover the 32-bit compile-test case.

Assisted-by: Codex:GPT-5.5
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 drivers/spi/Kconfig            | 3 ++-
 drivers/spi/spi-cadence-xspi.c | 4 ++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 8782514bb89b..957c3e065b83 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -321,7 +321,8 @@ config SPI_CADENCE_QUADSPI
 
 config SPI_CADENCE_XSPI
 	tristate "Cadence XSPI controller"
-	depends on OF && HAS_IOMEM && 64BIT
+	depends on HAS_IOMEM || COMPILE_TEST
+	depends on OF
 	depends on SPI_MEM
 	help
 	  Enable support for the Cadence XSPI Flash controller.
diff --git a/drivers/spi/spi-cadence-xspi.c b/drivers/spi/spi-cadence-xspi.c
index 32fa19ebf7a9..c45b29c043bf 100644
--- a/drivers/spi/spi-cadence-xspi.c
+++ b/drivers/spi/spi-cadence-xspi.c
@@ -22,6 +22,10 @@
 #include <linux/bitrev.h>
 #include <linux/util_macros.h>
 
+#ifndef CONFIG_64BIT
+#include <linux/io-64-nonatomic-lo-hi.h>
+#endif
+
 #define CDNS_XSPI_MAGIC_NUM_VALUE	0x6522
 #define CDNS_XSPI_MAX_BANKS		8
 #define CDNS_XSPI_NAME			"cadence-xspi"
-- 
2.54.0