spigen(4) SPI Generic IO driver and spibus(4) automatic clock adjustment

[brianfundakowskifeldman_gmail.com]

Added ioctl variants that include specification of the SPI clock speed to use within the transfer request.

[loos]

I haven't tested the code yet, but from what I see there is a bug WRT CS handling.

The CS is stored in the child ivar, I believe you are getting the CS set to 0 by a mistake.

The CS must be present in transfer structure (you should not rely on the existence of a kernel driver for the device).

We should probably get rid of the non clocked version of API and make the clocked functions the default API (not setting a clock produce the same result of non clocked version).

[GET|SET]_CLOCK_SPEED should set/get the SPI controller default speed and not the spigen default speed (allowing set the default clock freq for kernel drivers).

[loos]

dev/spibus/spigen.c

432

Use DEVMETHOD_END here