linux-kernel - Re: [PATCH v4 0/7] Clocksource changes for Pistachio CPUFreq.

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Message-ID: <20150728095128.GA23771@linux-mips.org>
Date:	Tue, 28 Jul 2015 11:51:28 +0200
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	Govindraj Raja <govindraj.raja@...tec.com>,
	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	devicetree@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Bresticker <abrestic@...omium.org>,
	James Hartley <James.Hartley@...tec.com>,
	Damien Horsley <Damien.Horsley@...tec.com>,
	James Hogan <James.Hogan@...tec.com>,
	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
	Ezequiel Garcia <ezequiel.garcia@...tec.com>
Subject: Re: [PATCH v4 0/7] Clocksource changes for Pistachio CPUFreq.

Daniel,

On Mon, Jul 27, 2015 at 03:00:11PM +0100, Govindraj Raja wrote:

> From: Ezequiel Garcia <ezequiel.garcia@...tec.com>
> 
> The purpose of this patchset is to support CPUFreq on Pistachio SoC.
> However, given Pistachio uses the MIPS GIC clocksource and clockevent drivers
> (clocked from the CPU), adding CPUFreq support needs some work.
> 
> This patchset changes the MIPS GIC clockevent driver to update the frequency of
> the per-cpu clockevents using a clock notifier.
> 
> Then, we add a clocksource driver for IMG Pistachio SoC, based on the 
> general purpose timers. The SoC only provides four timers, so we can't
> use them to implement the four clockevents and the clocksource.
> 
> However, we can use one of these timers to provide a clocksource and a
> sched clock. Given the general purpose timers are clocked from the peripheral
> system clock tree, they are not affected by CPU rate changes.
> 
> Patches 1 to 3 are just style cleaning and preparation work.
> Patch 4 adds the clockevent frequency update.
> Patches 5 and 6 add the new clocksource driver.
> Patch 7 introduces an option to enable the timer based clocksource on Pistachio.

if you're happy with this series feel free to add my ack to patch 7/7
which is the only one that touches arch/mips.

Alternatively I can carry this in the MIPS tree which would have tbe
benefit of better testing.

  Ralf
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