[PATCH 04/12] clocksource: Sched clock source for Versatile Express

[Linus Walleij]

On Tue, Feb 11, 2014 at 9:10 AM, Pawel Moll <pawel.moll at arm.com> wrote:

> This patch adds a trival sched clock source using free
> running, 24MHz clocked counter present in the ARM Ltd.
> Versatile Express platform's System Registers block.
>
> This code replaces the call in the VE machine code.
>
> Cc: Daniel Lezcano <daniel.lezcano at linaro.org>
> Cc: Thomas Gleixner <tglx at linutronix.de>
> Signed-off-by: Pawel Moll <pawel.moll at arm.com>

Even the Integrator is very similar, albeit using register 0x28 instead
of register 0x5c. cd commit
a79528e9d849803457b6235ddb1a1cfd4e11c6cd

It's one of these things where writing a device driver results in
more code than just registering this counter with the sched_clock
guts :-/

Getting the clock from the DT gives this nice feeling of having it all
complete, and sched_clock cannot really change frequency anyway
so I'm happy with this thing.

I'll augment it for Integrator when/if I find time.

Yours,
Linus Walleij