linux-kernel - Re: [PATCH V2 2/6] clocksource: tegra: add Tegra210 timer driver

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Date:   Tue, 29 Jan 2019 11:29:12 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Peter De Schrijver <pdeschrijver@...dia.com>
Cc:     Joseph Lo <josephl@...dia.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-kernel@...r.kernel.org,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-tegra@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V2 2/6] clocksource: tegra: add Tegra210 timer driver

On Tue, Jan 29, 2019 at 10:41:55AM +0200, Peter De Schrijver wrote:
> On Mon, Jan 28, 2019 at 04:09:08PM +0100, Thierry Reding wrote:
> 
> ...
> 
> > 
> > Up to here this is a duplicate of timer-tegra20.c. And a lot of
> > tegra210_timer_init() is the same as tegra20_timer_init() as well. Can't
> > we unify the two drivers instead?
> > 
> > The power cycle restrictions of the architected timer, do they not apply
> > to chips earlier than Tegra210 either? So don't we need all of these
> > additional features on the timer-tegra20.c driver as well? If so that
> 
> No. Chips prior to Tegra114 do not have an arch timer and the arch timer
> does work correctly on Cortex-A15 so Tegra114 and Tegra124 can use it.
> It's broken on Cortex-A57 though, so we can't use it as a wakeup source
> on Tegra210.

If chips prior to Tegra114 don't have an architected timer, then we
can't remove the timer-tegra20 driver, because we still need it on
Tegra20 and Tegra30, right?

Thierry

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