spi: Correct operations check in dm_spi_xfer()
At present we have to have an xfer() method even if it does nothing. This
is not correct, so fix it.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/include/spi.h b/include/spi.h
index 6fbb433..ba2c840 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -224,7 +224,7 @@
int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen);
/**
- * SPI transfer
+ * SPI transfer (optional if mem_ops is used)
*
* This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
* "bitlen" bits in the SPI MISO port. That's just the way SPI works.