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| author | Benoît Thébaudeau <benoit.thebaudeau@advansee.com> | 2012-08-10 08:51:50 +0000 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2012-09-01 14:58:25 +0200 |
| commit | cd2004037c01be34ebd61f49755fd252d03131aa (patch) | |
| tree | acbb26cfa8437894fba7a03ced61ef8dea2b6a92 /drivers/spi | |
| parent | 78befb695d0b28d9888fe5dee27dc80b24eac1c9 (diff) | |
| download | u-boot-imx-cd2004037c01be34ebd61f49755fd252d03131aa.zip u-boot-imx-cd2004037c01be34ebd61f49755fd252d03131aa.tar.gz u-boot-imx-cd2004037c01be34ebd61f49755fd252d03131aa.tar.bz2 | |
mxc_spi: Round up clock divider
Since the input frequency of the API is a maximum that should not be exceeded in
order for the devices to operate properly, the SPI clock divider should be
rounded up, not truncated.
Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/mxc_spi.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c index 2e15318..cf1462f 100644 --- a/drivers/spi/mxc_spi.c +++ b/drivers/spi/mxc_spi.c @@ -96,7 +96,7 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs, clk_src = mxc_get_clock(MXC_CSPI_CLK); - div = clk_src / max_hz; + div = DIV_ROUND_UP(clk_src, max_hz); div = get_cspi_div(div); debug("clk %d Hz, div %d, real clk %d Hz\n", @@ -147,7 +147,7 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs, * The following computation is taken directly from Freescale's code. */ if (clk_src > max_hz) { - pre_div = clk_src / max_hz; + pre_div = DIV_ROUND_UP(clk_src, max_hz); if (pre_div > 16) { post_div = pre_div / 16; pre_div = 15; |