diff options
| author | Clark Wang <xiaoning.wang@nxp.com> | 2019-03-06 06:30:45 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-03-18 12:17:44 +0000 |
| commit | 09c04466ce7ea494993c0635ba5edb6d2222a806 (patch) | |
| tree | aa9e0b1369d1ce45fa1d7e5904ea16ae8afdd270 /drivers/spi/spidev.c | |
| parent | c7a402599504384efe0e5232a4c78cb8eb7cb3d0 (diff) | |
spi: lpspi: add dma mode support
Add dma mode support for LPSPI. Any frame longer than half txfifosize will
be sent by dma mode.
For now, there are some limits:
1. The maximum transfer speed in master mode depends on the slave device,
at least 40MHz(tested by spi-nor on 8qm-lpddr4-arm2 base board);
2. The maximum transfer speed in slave mode is 15MHz(imx7ulp),
22MHz(8qm/qxp). In order to reach the maximum speed which is mentioned
in datasheet, the load of connect wires between master and slave
should be less than 15pF.
Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Acked-by: Fugang Duan <Fugang.duan@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spidev.c')
0 files changed, 0 insertions, 0 deletions