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

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Message-ID: <20190129084155.GX7714@pdeschrijver-desktop.Nvidia.com>
Date:   Tue, 29 Jan 2019 10:41:55 +0200
From:   Peter De Schrijver <pdeschrijver@...dia.com>
To:     Thierry Reding <thierry.reding@...il.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 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.

Peter.