[U-Boot] [PATCH 2/4] spi: add spi_set_speed func

[Thomas Chou]

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 at wytron.com.tw>
---
 drivers/spi/Makefile |    1 +
 drivers/spi/spi.c    |    9 +++++++++
 include/spi.h        |    8 ++++++++
 3 files changed, 18 insertions(+), 0 deletions(-)
 create mode 100644 drivers/spi/spi.c

diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index e34a124..c4eb627 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -25,6 +25,7 @@ include $(TOPDIR)/config.mk
 
 LIB	:= $(obj)libspi.o
 
+COBJS-$(CONFIG_MMC_SPI) += spi.o
 COBJS-$(CONFIG_ALTERA_SPI) += altera_spi.o
 COBJS-$(CONFIG_ATMEL_DATAFLASH_SPI) += atmel_dataflash_spi.o
 COBJS-$(CONFIG_ATMEL_SPI) += atmel_spi.o
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
new file mode 100644
index 0000000..944466a
--- /dev/null
+++ b/drivers/spi/spi.c
@@ -0,0 +1,9 @@
+#include <common.h>
+#include <spi.h>
+
+/* default func for SPI driver without set speed func */
+static void __spi_set_speed(struct spi_slave *slave, uint hz)
+{
+}
+void spi_set_speed(struct spi_slave *slave, uint hz)
+	__attribute__((weak, alias("__spi_set_speed")));
diff --git a/include/spi.h b/include/spi.h
index 320e50e..7887d0f 100644
--- 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
-- 
1.7.3.4