[PATCH v2 1/2] spi: add DM_SPI_FLASH compatibility inline functions

[Neil Armstrong]

To smoothly handle the transition from the legacy SPI FLASH
API to the the driver model API, add the DM functions
as dummy inline functions.

Today, client code uses #if/#else conditionals, but it's better
to use if(IS_ENABLED()) to make sure all code builds fine
and avoid configuration hell, leaving the compiler remove
the dead code.

An example is cmd/sf, which could make use of those dummy
functions to drop the conditional compilation.

Signed-off-by: Neil Armstrong <neil.armstrong at linaro.org>
---
 include/spi_flash.h | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/include/spi_flash.h b/include/spi_flash.h
index 10d19fd4b11..2e703e85250 100644
--- a/include/spi_flash.h
+++ b/include/spi_flash.h
@@ -139,6 +139,40 @@ int sandbox_sf_bind_emul(struct sandbox_state *state, int busnum, int cs,
 void sandbox_sf_unbind_emul(struct sandbox_state *state, int busnum, int cs);
 
 #else
+/* Compatibility functions for when DM_SPI_FLASH is disabled */
+static inline int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs,
+					 struct udevice **devp)
+{
+	return -ENODEV;
+}
+
+static inline int spi_flash_read_dm(struct udevice *dev, u32 offset, size_t len,
+				    void *buf)
+{
+	return -ENODEV;
+}
+
+static inline int spi_flash_write_dm(struct udevice *dev, u32 offset, size_t len,
+				     const void *buf)
+{
+	return -ENODEV;
+}
+
+static inline int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len)
+{
+	return -ENODEV;
+}
+
+static inline int spl_flash_get_sw_write_prot(struct udevice *dev)
+{
+	return -ENODEV;
+}
+
+static inline int spi_flash_std_probe(struct udevice *dev)
+{
+	return -ENODEV;
+}
+
 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 		unsigned int max_hz, unsigned int spi_mode);
 

-- 
2.34.1