From fa1423e707b30b3eb5251e976560ed5decfd2e3c Mon Sep 17 00:00:00 2001 From: Thomas Chou Date: Fri, 24 Dec 2010 15:16:07 +0800 Subject: [PATCH] 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 Signed-off-by: Mike Frysinger --- include/spi.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/spi.h b/include/spi.h index 320e50e529..7887d0f9b8 100644 --- 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 -- 2.30.2