On Sunday 10 April 2016 07:37:23 Reizer, Eyal wrote:

Add support for using with both wl12xx and wl18xx.

- all wilink family needs special init command for entering wspi mode.
  extra clock cycles should be sent after the spi init command while the
  cs pin is high.
- switch to controling the cs pin from the spi driver for achieveing the
  above.
- the selected cs gpio is read from the spi device-tree node using the
  cs-gpios field and setup as a gpio.
- See the example below for specifying the cs gpio using the cs-gpios entry
&spi0   {
        ...
        cs-gpios = <&gpio0 5 0>;
        ...
        wlcore: wlcore@0 {
                compatible = "ti,wl1835";
        ...
        ...
        };
};

Signed-off-by: Eyal Reizer <redacted>

I don't think this can work in general: not all SPI hosts uses GPIOs
for controlling CS, so the logic can't work, and it's also a layering
violation for the driver to look at the parent.

I would suggest fixing this using a new API function from the SPI
core, if we don't already have a generic way to do it.

	Arnd