linux-kernel - Re: [PATCH v2 4/9] clocksource: mediatek: Use GPT as sched clock source

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Date:	Sat, 11 Jul 2015 18:32:37 +0800
From:	Yingjoe Chen <yingjoe.chen@...iatek.com>
To:	Matthias Brugger <matthias.bgg@...il.com>
CC:	Daniel Kurtz <djkurtz@...omium.org>,
	Mark Rutland <mark.rutland@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	"Pawel Moll" <pawel.moll@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Marc Carino <marc.ceeeee@...il.com>,
	"Rob Herring" <robh+dt@...nel.org>,
	<linux-mediatek@...ts.infradead.org>,
	"Sascha Hauer" <kernel@...gutronix.de>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 4/9] clocksource: mediatek: Use GPT as sched clock
 source

On Fri, 2015-07-03 at 17:51 +0200, Matthias Brugger wrote:
> On Friday, July 03, 2015 09:48:42 PM Daniel Kurtz wrote:

<...>

> > >> @@ -243,6 +251,8 @@ static void __init mtk_timer_init(struct device_node
> > >> *node)>> 
> > >>         mtk_timer_setup(evt, GPT_CLK_SRC, TIMER_CTRL_OP_FREERUN, 1);
> > >>         clocksource_mmio_init(evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC),
> > >>         
> > >>                         node->name, rate, 300, 32,
> > >>                         clocksource_mmio_readl_up);
> > >> 
> > >> +       gpt_base = evt->gpt_base;
> > > 
> > > This is really hacky. We should clean up the code and provide
> > > mtk_clock_event_device globally.
> > > Please add the patch below, which does exactly this.
> > 
> > I don't think this is so hacky.
> > In light of Stephen's comment about the benefit of using
> > container_of() to extract gpt_base from the passed in struct
> > clock_event_device in the other routines, what is the benefit of
> > making more of mtk_clock_event_device global?
> > I think what Yingjoe has implemented is short and sweet.
> > 
> 
> Huh, this patch got somehow forgotten.
> Ok, just one comment. I would prefer to rename the global gpt_base to 
> gpt_sched_base or something similar and set the pointer + offset directly 
> mtk_timer_init.


In next version, I will it change to:

static void __iomem *gpt_sched_reg __read_mostly;

and in mtk_timer_init:

+       gpt_sched_reg = evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC);

Joe.C


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