[PATCH v2] spi: zynqmp_gqspi: support dual and quad mode

[Bin Meng]

On Thu, Jan 21, 2021 at 12:40 AM Brandon Maier
<brandon.maier at rockwellcollins.com> wrote:
>
> The dm_spi_ops.xfer() API does not support dual and quad SPI modes. It
> also doesn't allow the zynqmp_gqspi driver to calculate the correct
> number of dummy cycles for some NOR ops (as doing so also requires the
> buswidth).
>
> Port the zynqmp_gqspi driver to spi_controller_mem_ops, which gives us
> the buswidth values to correctly support all SNOR_PROTO_X_X_X commands
> and to properly calculate dummy cycles.
>
> Signed-off-by: Brandon Maier <brandon.maier at rockwellcollins.com>
> CC: jagan at amarulasolutions.com
> CC: michal.simek at xilinx.com
> CC: Ashok Reddy Soma <ashokred at xilinx.com>
> ---
> v1: https://lists.denx.de/pipermail/u-boot/2021-January/437506.html
>
> v2:
> - Initialize 'ret' to 0 for exec_op() commands without data in/out.
> ---
>  drivers/spi/zynqmp_gqspi.c | 164 ++++++++++++++++---------------------
>  1 file changed, 70 insertions(+), 94 deletions(-)
>

Reviewed-by: Bin Meng <bin.meng at windriver.com>