How to decrease the delay between spi transfer and CS action?

[ShaneCCC]

Have a reference to below to use GPIO as chipselect.

Multiple TX2 SPI slave select with GPIO in dtb

Please refer nvidia,spi-tegra114.txt under Documentation/devicetree/bindings/spi spi-client device controller properties: nvidia,chipselect-gpio: Chipselect GPIO number as per gpio binding. Please check spi-bus.txt for spi bus . for example the controller has 2 CS lines, and the cs-gpios property looks like this: cs-gpios = <&gpio1 0 0> <0> <&gpio1 1 0> <&gpio1 2 0>;