GPIO CS support and set mode and clock

[yamori813_yahoo.co.jp]

Summary

Add gpio cs support. This is dts

&spi1 {
        status = "okay";
        cs-gpios = <&gpio0 18 GPIO_ACTIVE_LOW>;
        non-flash;
        spigen@0 {
                compatible = "freebsd,spigen";
                spi-max-frequency = <10000000>;
        };
};

Almost same as OpenWRT. But current code depend on flash access.
I add non-flash property by ignore.

I try RT5350 spi1 registor but not worki fo me. I am abandon.

mode and clock set on transfer.

I use this code on small lcd device.

Test Plan

RT3050 and RT5350

[yamori813_yahoo.co.jp]

This is dmesg.

http://dmesgd.nycbug.org/index.cgi?do=view&id=4886

[yamori813_yahoo.co.jp]

This is my test environment.

[adrian]

Hey this looks good! I don't have any hardware to test it on right now though so I'll take your word for it.