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>
14 years ago · fa1423e707
parent f02efacc51
commit fa1423e707
1 changed files with 8 additions and 0 deletions
--- a/include/spi.h
+++ b/include/spi.h
@ -176,6 +176,14 @@ 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
 *   byte:	Byte to be written