linux-kernel - Re: [PATCH 5/7] soc: brcmstb: add wake-timer driver

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Message-ID: <CADtm3G7qui2Yi6j-pFSGO9sGdHde1hy-c9wAWfQ38Dg8rKq2Qg@mail.gmail.com>
Date:	Thu, 18 Jun 2015 19:20:26 -0700
From:	Gregory Fong <gregory.0xf0@...il.com>
To:	Brian Norris <computersforpeace@...il.com>
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH 5/7] soc: brcmstb: add wake-timer driver

On Thu, Jun 18, 2015 at 5:11 PM, Brian Norris
<computersforpeace@...il.com> wrote:
> Useful for waking the system from suspend after a specified period of
> time.
>
> This IP could potentially be supported as an RTC driver (for use with
> the 'rtcwake' utility), but it is not battery backed, so that's not a
> great fit. Implement a custom sysfs interface instead.
>
> Signed-off-by: Brian Norris <computersforpeace@...il.com>
> ---
>  .../ABI/testing/sysfs-driver-wktmr-brcmstb         |  12 +
>  drivers/soc/brcmstb/Kconfig                        |   3 +
>  drivers/soc/brcmstb/Makefile                       |   1 +
>  drivers/soc/brcmstb/wktmr.c                        | 242 +++++++++++++++++++++
>  4 files changed, 258 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-driver-wktmr-brcmstb
>  create mode 100644 drivers/soc/brcmstb/wktmr.c
>
> diff --git a/Documentation/ABI/testing/sysfs-driver-wktmr-brcmstb b/Documentation/ABI/testing/sysfs-driver-wktmr-brcmstb
> new file mode 100644
> index 000000000000..e563f8b8d969
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-driver-wktmr-brcmstb
> @@ -0,0 +1,12 @@
> +What:          /sys/bus/platform/drivers/brcm-waketimer/<MMIO-address>.waketimer/timeout
> +Date:          November 21, 2014
> +KernelVersion: 3.14
> +Contact:       Brian Norris <norris@...adcom.com>

Shouldn't this be "Brian Norris <computersforpeace@...il.com>"?

> +Description:   The control file for the wakeup timer. This integer value
> +               represents the number of seconds between a suspend operation
> +               (e.g., S3 suspend-to-RAM) and the time at which the wakeup
> +               timer should fire.
> [...]
> diff --git a/drivers/soc/brcmstb/wktmr.c b/drivers/soc/brcmstb/wktmr.c
> new file mode 100644
> index 000000000000..89f989724d3c
> --- /dev/null
> +++ b/drivers/soc/brcmstb/wktmr.c
> @@ -0,0 +1,242 @@
> [...]
> +
> +static void brcmstb_waketmr_set_alarm(struct brcmstb_waketmr *timer,
> +               unsigned int secs)
> +{
> +       unsigned int t;

Use u32.

> +
> +       brcmstb_waketmr_clear_alarm(timer);
> +
> +       t = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
> +       writel_relaxed(t + secs + 1, timer->base + BRCMSTB_WKTMR_ALARM);
> +}
> +
> [...]
> +static int brcmstb_waketmr_probe(struct platform_device *pdev)
> +{
> [...]
> +       /*
> +        * Set wakeup capability before requesting wakeup interrupt, so we can
> +        * process boot-time "wakeups" (e.g., from S5 soft-off)
> +        */
> +       device_set_wakeup_capable(dev, true);
> +       device_wakeup_enable(dev);
> +
> +       timer->irq = platform_get_irq(pdev, 0);
> +       if ((int)timer->irq < 0)

Probably better to just have timer->irq be a signed int so you don't
need this cast.

> [snip]

Acked-by: Gregory Fong <gregory.0xf0@...il.com>
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