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authorMichal Suchanek <hramrach@gmail.com>2016-06-14 12:10:04 +0000
committerMark Brown <broonie@kernel.org>2016-06-27 19:18:35 +0100
commit0b06d8cf4f9307887d52776d77bdbc8d6dd9d98d (patch)
tree52403a0ab3aab4d3e77e376543b00f6aa38b9bb4
parent794912cff6dba8b5e93948243299bb0b2cb11277 (diff)
spi: sunxi: set maximum and minimum speed of SPI master
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>
-rw-r--r--drivers/spi/spi-sun4i.c2
-rw-r--r--drivers/spi/spi-sun6i.c2
2 files changed, 4 insertions, 0 deletions
diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c
index 07ce7c97750e..d02cf9829f1a 100644
--- a/drivers/spi/spi-sun4i.c
+++ b/drivers/spi/spi-sun4i.c
@@ -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;
diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c
index 6fa6ff12ae61..d5a6a2e5f54a 100644
--- a/drivers/spi/spi-sun6i.c
+++ b/drivers/spi/spi-sun6i.c
@@ -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;