Add dt binding documentation details for Xilinx FPGA configuration
over slave serial interface.
Signed-off-by: NAnatolij Gustschin <agust@denx.de>
Acked-by: NMoritz Fischer <mdf@kernel.org>
Acked-by: NRob Herring <robh@kernel.org>
Acked-by: NMichal Simek <michal.simek@xilinx.com>
Acked-by: NAlan Tull <atull@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>