I’m a bit confused how to interpret the CS section of spi/spi-bus.txt: Optional properties (master mode only): - cs-gpios - gpios chip select. - num-cs - total number of chipselects. If cs-gpios is used the number of chip selects will be increased automatically with max(cs-gpios > hw cs). So if 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>; Then it should be configured so that num_chipselect = 4 with the following mapping: cs0 : &gpio1 0 0 cs1 : native cs2 : &gpio1 1 0 cs3 : &gpio1 2 0 —— cut —- My confusion lays around how things work with a mix of “hardware” CS and GPIO CS. 1. Is num-cs the total number of CS (Hardware CS + GPIO CS)? 2. Should the size of cs-gpios be num-cs? (Regardless of # of Hardware CS or GPIO CS) Some area’s of confusion * What does “increased automatically” mean? * Is max(cs-gpios > hw cs) suppose to be max(cs-gpios, hw cs)? * The example used talks about 2 CS lines, but only utilizes one. Is that on purpose? Thanks - k
