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spi: sunxi: set maximum and minimum speed of SPI master

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The speed limits are unset in the sun4i and sun6i SPI drivers.

The maximum speed of SPI master is used when maximum speed of SPI slave
is not specified. Also the __spi_validate function should check that
transfer speeds do not exceed the master limits.

The user manual for A10 and A31 specifies maximum
speed of the SPI clock as 100MHz and minimum as 3kHz.

Setting the SPI clock to out-of-spec values can lock up the SoC.

Signed-off-by: Michal Suchanek <hramrach@gmail.com>
--
v2:
new patch
v3:
fix constant style
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Michal Suchanek 2016-06-14 12:10:04 +00:00 committed by Mark Brown
parent 794912cff6
commit 0b06d8cf4f
2 changed files with 4 additions and 0 deletions
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2
drivers/spi/spi-sun4i.c
View file

@ -392,6 +392,8 @@ static int sun4i_spi_probe(struct platform_device *pdev)
}
sspi->master = master;
master->max_speed_hz = 100 * 1000 * 1000;
master->min_speed_hz = 3 * 1000;
master->set_cs = sun4i_spi_set_cs;
master->transfer_one = sun4i_spi_transfer_one;
master->num_chipselect = 4;

2
drivers/spi/spi-sun6i.c
View file

@ -390,6 +390,8 @@ static int sun6i_spi_probe(struct platform_device *pdev)
}
sspi->master = master;
master->max_speed_hz = 100 * 1000 * 1000;
master->min_speed_hz = 3 * 1000;
master->set_cs = sun6i_spi_set_cs;
master->transfer_one = sun6i_spi_transfer_one;
master->num_chipselect = 4;