spi: rspi: Round up division to avoid slave overclocking

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The calculation of the bit rate divider used a standard C division, which
rounds down the quotient. This may lead to a higher bitrate than requested.
Round up to avoid this.

E.g. on Koelsch, the SPI flash (configured for 30 MHz) was driven at 48.75
MHz. After this patch it's driven at a safe 24.375 MHz.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>

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Geert Uytterhoeven 2014-05-22 20:07:35 +02:00 • committed by Mark Brown

parent c9eaa447e7

commit 3beb61dbfc

1 changed files with 5 additions and 3 deletions

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drivers/spi/spi-rspi.c

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