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[U-Boot,1/2] spi: add spi_set_speed func

Message ID 1303710497-25371-2-git-send-email-vapier@gentoo.org
State Accepted
Headers show

Commit Message

Mike Frysinger April 25, 2011, 5:48 a.m. UTC 
From: Thomas Chou <thomas@wytron.com.tw>

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>
---
 include/spi.h |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
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Patch

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