altera_spi: add spi_set_speed

Added this for mmc_spi driver. Though altera spi core does not support programmable speed. It is fixed when configured in sopc-builder.

Signed-off-by Thomas Chou <[email protected]>

---
 drivers/spi/altera_spi.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

drivers/spi/altera_spi.c +5 -0

index 918b223..138d6f4 100644
@@ -70,6 +70,11 @@ void spi_init(void)
 {
 }
 
+void spi_set_speed(struct spi_slave *slave, uint hz)
+{
+	/* altera spi core does not support programmable speed */
+}
+
 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
 				  unsigned int max_hz, unsigned int mode)
 {