linux-kernel - Re: [PATCH v1 02/10] clockevents/drivers: add MPS2 Timer driver

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Date:	Mon, 14 Dec 2015 14:36:18 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Vladimir Murzin <vladimir.murzin@....com>, arnd@...db.de,
	linux@....linux.org.uk, gregkh@...uxfoundation.org,
	tglx@...utronix.de, u.kleine-koenig@...gutronix.de,
	afaerber@...e.de, mcoquelin.stm32@...il.com
Cc:	Mark.Rutland@....com, Pawel.Moll@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	jslaby@...e.cz, robh+dt@...nel.org, devicetree@...r.kernel.org,
	linux-serial@...r.kernel.org, linux-api@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 02/10] clockevents/drivers: add MPS2 Timer driver

On 12/02/2015 10:33 AM, Vladimir Murzin wrote:
> MPS2 platform has simple 32 bits general purpose countdown timers.
>
> The driver uses the first detected timer as a clocksource and the rest
> of the timers as a clockevent
>
> Signed-off-by: Vladimir Murzin <vladimir.murzin@....com>
> ---

[ ... ]

> +static void clockevent_mps2_writel(u32 val, struct clock_event_device *c, u32 offset)
> +{
> +	writel(val, to_mps2_clkevt(c)->reg + offset);
> +}

Is it possible to use writel_relaxed here ?

[ ... ]

> +static int mps2_timer_set_periodic(struct clock_event_device *ce)
> +{
> +	u32 clock_count_per_tick = to_mps2_clkevt(ce)->clock_count_per_tick;
> +
> +	clockevent_mps2_writel(clock_count_per_tick, ce, TIMER_RELOAD);
> +	clockevent_mps2_writel(clock_count_per_tick, ce, TIMER_VALUE);
> +	clockevent_mps2_writel(TIMER_CTRL_IE | TIMER_CTRL_ENABLE, ce, TIMER_CTRL);
> +
> +	return 0;
> +}
> +
> +static irqreturn_t mps2_timer_interrupt(int irq, void *dev_id)
> +{
> +	struct clockevent_mps2 *ce = dev_id;
> +	u32 status = readl(ce->reg + TIMER_INT);
> +
> +	if (!status) {
> +		pr_warn("spuirous interrupt\n");

typo: 'spurious'

[ ... ]

> +	ce = kzalloc(sizeof(struct clockevent_mps2), GFP_KERNEL);
> +	if (!ce) {
> +		ret = -ENOMEM;
> +		pr_err("failed to allocate clockevent: %d\n", ret);

There is already a stack trace in the kernel when an allocation fails.

With the above fixed:

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>


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