linux-kernel - Re: [PATCH v2 4/9] arm: twr-k70f120m: timer driver for Kinetis SoC

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Date:	Wed, 1 Jul 2015 09:51:49 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Paul Osmialowski <pawelo@...g.net.pl>
cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Jiri Slaby <jslaby@...e.cz>, Kumar Gala <galak@...eaurora.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Michael Turquette <mturquette@...libre.com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
	dmaengine@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Paul Bolle <pebolle@...cali.nl>,
	Uwe Kleine-Koenig <u.kleine-koenig@...gutronix.de>,
	Anson Huang <b20788@...escale.com>,
	Frank Li <Frank.Li@...escale.com>,
	Jingchang Lu <jingchang.lu@...escale.com>,
	Rob Herring <r.herring@...escale.com>,
	Yuri Tikhonov <yur@...raft.com>,
	Sergei Poselenov <sposelenov@...raft.com>,
	Alexander Potashev <aspotashev@...raft.com>
Subject: Re: [PATCH v2 4/9] arm: twr-k70f120m: timer driver for Kinetis SoC

On Tue, 30 Jun 2015, Paul Osmialowski wrote:
> +static struct kinetis_clock_event_ddata
> +		kinetis_clockevent_tmrs[KINETIS_PIT_CHANNELS] = {
> +	{
> +		.evtdev = {
> +			.name		= "kinetis-clockevent0",
> +			.rating		= 200,
> +			.features	=
> +			    CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
> +			.set_next_event	= kinetis_clockevent_tmr_set_next_event,
> +			.set_state_periodic =
> +				kinetis_clockevent_tmr_set_state_periodic,
> +			.set_state_oneshot =
> +				kinetis_clockevent_tmr_set_state_oneshot,
> +			.set_state_oneshot_stopped =
> +				kinetis_clockevent_tmr_set_state_oneshot,
> +			.set_state_shutdown =
> +				kinetis_clockevent_tmr_set_state_oneshot,
> +		},
> +	},
> +	{
> +		.evtdev = {
> +			.name		= "kinetis-clockevent1",
> +		},

So how is that supposed to work if timer 1,2 or 3 is selected from
device tree? The function pointers are not initialized.

You really do not need that array at all. You can simply set the name
at init time.

> +		clockevents_register_device(
> +				&kinetis_clockevent_tmrs[chan].evtdev);
> +
> +		kinetis_pit_init(&kinetis_clockevent_tmrs[chan],
> +						(rate / HZ) - 1);
> +		kinetis_pit_enable(&kinetis_clockevent_tmrs[chan], 1);

No point doing this. The core code has invoked the set_periodic call
back via clockevents_register_device() already.

Thanks,

	tglx
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