linux-kernel - Re: [RFC PATCH v2 10/14] m68k: mac: Convert to clocksource API

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Message-ID: <CACRpkdZdJDYaOi1HeMiS2hkjOf0gjQphGXy-Ka+m=1LbDCXPfA@mail.gmail.com>
Date:   Tue, 20 Nov 2018 09:15:42 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     fthain@...egraphics.com.au
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>, funaho@...ai.org,
        schwab@...ux-m68k.org, Arnd Bergmann <arnd@...db.de>,
        schivers@....com.au, Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        schmitzmic@...il.com, John Stultz <john.stultz@...aro.org>,
        linux-m68k@...ts.linux-m68k.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v2 10/14] m68k: mac: Convert to clocksource API

On Mon, Nov 19, 2018 at 2:22 AM Finn Thain <fthain@...egraphics.com.au> wrote:

> Add a platform clocksource by adapting the existing arch_gettimeoffset
> implementation.
>
> Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
> Acked-by: Linus Walleij <linus.walleij@...aro.org>
> Tested-by: Stan Johnson <userm57@...oo.com>

As noted for the Amiga CIA (which is pretty much a sibling to this
MOS 6522 VIA) this chip also has two counters and could use one
as clocksource and the other as clock event.

Again I bet this is just using one timer out of habit.

It will be an easy feat to make a clean clocksource+clock event
for this hardware as well once this refactoring is complete.

Yours,
Linus Walleij