linux-kernel - Re: [PATCH 2/2] arm64: dts: mt8173: add timer node

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Message-ID: <55FAC570.8040307@arm.com>
Date:	Thu, 17 Sep 2015 14:51:44 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>
Cc:	Sudeep Holla <sudeep.holla@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Michael Turquette <mturquette@...libre.com>,
	James Liao <jamesjj.liao@...iatek.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	"linux-mediatek@...ts.infradead.org" 
	<linux-mediatek@...ts.infradead.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Olof Johansson <olof@...om.net>,
	"srv_heupstream@...iatek.com" <srv_heupstream@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Daniel Kurtz <djkurtz@...omium.org>,
	"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
	Eddie Huang <eddie.huang@...iatek.com>
Subject: Re: [PATCH 2/2] arm64: dts: mt8173: add timer node



On 16/09/15 03:04, Yingjoe Chen wrote:
> From: Daniel Kurtz <djkurtz@...omium.org>
>
> Add device node to enable GPT timer. This timer will be
> used as sched clock source.
>

Interesting any known issues with or advantage over the arch timers
to prefer it as sched clock source. I see even arch timers are present
in DT, hence the question. Or is it just a incorrect commit log ?

How does this get selected as sched clock source ? I don't see
sched_clock_register in mtk_timer.c

To be clear, I am not against adding this timer support, but just want
to know is it preferred for sched clock source ? if yes why ? better
resolution ?

> Change-Id: Idc4e3f0ee80b5c36cae6f0f2328f94aafcca1253

^ Should be dropped

> Signed-off-by: Daniel Kurtz <djkurtz@...omium.org>
> Signed-off-by: Eddie Huang <eddie.huang@...iatek.com>
> Signed-off-by: Yingjoe Chen <yingjoe.chen@...iatek.com>
> ---
>   arch/arm64/boot/dts/mediatek/mt8173.dtsi | 9 +++++++++
>   1 file changed, 9 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> index d18ee42..d763803 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> @@ -238,6 +238,15 @@
>   			reg = <0 0x10007000 0 0x100>;
>   		};
>
> +		timer: timer@...08000 {
> +			compatible = "mediatek,mt8173-timer",

Missing documentation ? I am referring upstream and it might be in some 
patches already queued perhaps ?

Regards,
Sudeep
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