Re: [PATCH v4 0/7] Clocksource changes for Pistachio CPUFreq.
From: Daniel Lezcano
Date: Tue Aug 04 2015 - 05:48:44 EST
On 07/28/2015 11:51 AM, Ralf Baechle wrote:
Daniel,
On Mon, Jul 27, 2015 at 03:00:11PM +0100, Govindraj Raja wrote:
From: Ezequiel Garcia <ezequiel.garcia@xxxxxxxxxx>
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.
Ok, go ahead.
For the series 1-4: Acked-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
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