linux-kernel - Re: [PATCH v7 3/3] clocksource: Add clockevent support to NPS400 driver

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Date:   Wed, 16 Nov 2016 07:44:55 -0600
From:   Rob Herring <robh@...nel.org>
To:     Noam Camus <noamca@...lanox.com>
Cc:     mark.rutland@....com, daniel.lezcano@...aro.org,
        tglx@...utronix.de, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 3/3] clocksource: Add clockevent support to NPS400
 driver

On Tue, Nov 15, 2016 at 10:50:59AM +0200, Noam Camus wrote:
> From: Noam Camus <noamca@...lanox.com>
> 
> Till now we used clockevent from generic ARC driver.
> This was enough as long as we worked with simple multicore SoC.
> When we are working with multithread SoC each HW thread can be
> scheduled to receive timer interrupt using timer mask register.
> This patch will provide a way to control clock events per HW thread.
> 
> The design idea is that for each core there is dedicated register
> (TSI) serving all 16 HW threads.
> The register is a bitmask with one bit for each HW thread.
> When HW thread wants that next expiration of timer interrupt will
> hit it then the proper bit should be set in this dedicated register.
> When timer expires all HW threads within this core which their bit
> is set at the TSI register will be interrupted.
> 
> Driver can be used from device tree by:
> compatible = "ezchip,nps400-timer0" <-- for clocksource
> compatible = "ezchip,nps400-timer1" <-- for clockevent
> 
> Note that name convention for timer0/timer1 was taken from legacy
> ARC design. This design is our base before adding HW threads.
> For backward compatibility we keep "ezchip,nps400-timer" for clocksource
> 
> Signed-off-by: Noam Camus <noamca@...lanox.com>
> ---
>  .../bindings/timer/ezchip,nps400-timer.txt         |   15 --
>  .../bindings/timer/ezchip,nps400-timer0.txt        |   17 ++
>  .../bindings/timer/ezchip,nps400-timer1.txt        |   15 ++

Please add acks when reposting.

Acked-by: Rob Herring <robh@...nel.org>

>  drivers/clocksource/timer-nps.c                    |  170 ++++++++++++++++++++
>  4 files changed, 202 insertions(+), 15 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/timer/ezchip,nps400-timer.txt
>  create mode 100644 Documentation/devicetree/bindings/timer/ezchip,nps400-timer0.txt
>  create mode 100644 Documentation/devicetree/bindings/timer/ezchip,nps400-timer1.txt