spi: dw: Add Microchip Sparx5 support
This adds SPI support for the Sparx5 SoC, which is using the MMIO
Designware SPI controller.
The Sparx5 differs from the Ocelot version in these areas:
* The CS override is controlled by a new set of registers for
this purpose.
* The Sparx5 SPI controller has the RX sample delay register, and it
must be configured for the (SPI NAND) device on SPI2.
* The Sparx5 SPI controller has 2 different SPI bus interfaces on the
same controller (don't ask...). The "spi-mux" driver should be used
in conjunction with the SPI driver to select the appropriate bus.
Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
Link: https://lore.kernel.org/r/20200824203010.2033-3-lars.povlsen@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
1 file changed