spi: add spi_set_speed func

This func helps mmc_spi driver set correct speed for mmc/sd, as
mmc card needs 400KHz clock for spi mode initialization.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

diff --git a/include/spi.h b/include/spi.h
index 320e50e5296ca1914cc30c36c882cf576abdd4a5..7887d0f9b842c48058f404fdf3075df792d50536 100644 (file)
--- a/include/spi.h
+++ b/include/spi.h
@@ -175,6 +175,14 @@ void spi_cs_activate(struct spi_slave *slave);
  */
 void spi_cs_deactivate(struct spi_slave *slave);
 
+/*-----------------------------------------------------------------------
+ * Set transfer speed.
+ * This sets a new speed to be applied for next spi_xfer().
+ *   slave:    The SPI slave
+ *   hz:       The transfer speed
+ */
+void spi_set_speed(struct spi_slave *slave, uint hz);
+
 /*-----------------------------------------------------------------------
  * Write 8 bits, then read 8 bits.
  *   slave:    The SPI slave we're communicating with