[RFC PATCH] pwm: add pwm-atmel from Linux kernel 4.14

[Sascha Hauer]

On Mon, Jan 01, 2018 at 10:33:32PM +0100, Sam Ravnborg wrote:
> Following patch is more or less untested.
> 
> It is posted to get feedback if this is the right way to
> implement support for pwms in at91sam9263 & friends.
> 
> In the kernel there is also a file named pwm-atmel-tcb.
> I dunno which is the better starting point.

Looks good, but I don't know the hardware and can't say what
pwm-atmel-tcb is for.

> 
> The patch will recognize pwm0 on the at91sam9263ek board
> (if status = "okay") so it has seen minimal testing.
> But I have yet to utilize any of the pwm's.
> 
> While working with this I get the impression that the core
> should know about pwm channels and device_d pointer
> should be part of the core data.

I know it's done like this in Linux. Any good reason to do this in
barebox aswell besides of "do it as in Linux"?

Sascha

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