[PATCH v2 4/9] clocksource: mediatek: Use GPT as sched clock source
yingjoe.chen at mediatek.com
Sat Jul 11 03:32:37 PDT 2015
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
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);
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