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spi: davinci: change the lower limit of pre-scale divider to 1 

SPI hardware spec for Keystone specify a lower value of 0 for pre-scale
divider which determine what max value of spi clock (spi-max-frequency)
the device can support. This translates to a clock divider of 2. So fix
the lower limit value used for the boundary check in
davinci_spi_get_prescale() function to 1 so that a maximum of spi device
clock rate / 2 is possible to be set for spi-max-frequency.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Acked-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Murali Karicheri 2015-06-10 03:23:42 -04:00 committed by Mark Brown
parent b787f68c36
commit e0b047bd8f
1 changed files with 1 additions and 1 deletions
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2
drivers/spi/spi-davinci.c
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@ -265,7 +265,7 @@ static inline int davinci_spi_get_prescale(struct davinci_spi *dspi,
ret = DIV_ROUND_UP(clk_get_rate(dspi->clk), max_speed_hz);
if (ret < 3 || ret > 256)
if (ret < 1 || ret > 256)
return -EINVAL;
return ret - 1;