linux-kernel - Re: Fwd: [PATCH 3/8] watchdog: davinci: add GET

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Date:	Mon, 18 Nov 2013 15:21:08 +0200
From:	"ivan.khoronzhuk" <ivan.khoronzhuk@...com>
To:	Guenter Roeck <linux@...ck-us.net>,
	Santosh Shilimkar <santosh.shilimkar@...com>, <wim@...ana.be>,
	<nsekhar@...com>, <linux-watchdog@...r.kernel.org>,
	<devicetree@...r.kernel.org>
CC:	<grant.likely@...aro.org>, <rob.herring@...xeda.com>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<swarren@...dotorg.org>, <galak@...nel.crashing.org>,
	<ijc+devicetree@...lion.org.uk>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: Fwd: [PATCH 3/8] watchdog: davinci: add GET_TIMELEFT option support

On 11/17/2013 04:22 AM, Guenter Roeck wrote:
> On 11/06/2013 03:31 AM, ivan.khoronzhuk wrote:
>> Currently, the davinci watchdog can be read while counting,
>> so we can add ability to report the remaining time before
>> the system will reboot.
>>
>> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...com>
>> ---
>>   drivers/watchdog/davinci_wdt.c |   28 ++++++++++++++++++++++++++++
>>   1 file changed, 28 insertions(+)
>>
>> diff --git a/drivers/watchdog/davinci_wdt.c
>> b/drivers/watchdog/davinci_wdt.c
>> index 1fc2093..6cbf2e1 100644
>> --- a/drivers/watchdog/davinci_wdt.c
>> +++ b/drivers/watchdog/davinci_wdt.c
>> @@ -117,6 +117,33 @@ static int davinci_wdt_ping(struct
>> watchdog_device *wdd)
>>       return 0;
>>   }
>>
>> +static unsigned int davinci_wdt_get_timeleft(struct watchdog_device
>> *wdd)
>> +{
>> +    u64 timer_counter;
>> +    unsigned long freq;
>> +    u32 val;
>> +    struct davinci_wdt_device *davinci_wdt = watchdog_get_drvdata(wdd);
>> +
>> +    /* if timeout is occured then return 0 */
>
> is -> has ?
>

Yes

>> +    val = ioread32(davinci_wdt->base + WDTCR);
>> +    if (val & WDFLAG)
>> +        return 0;
>> +
>> +    freq = clk_get_rate(davinci_wdt->clk);
>> +
>> +    if (!freq) {
>> +        dev_err(wdd->dev, "clock freq is not set\n");
>> +        return 0;
>> +    }
>> +
> This error check doesn't make sense to me; elsewhere the clock rate is
> not validated.
> I would suggest to just return 0 here.
>

Agree

>> +    timer_counter = ioread32(davinci_wdt->base + TIM12);
>> +    timer_counter |= ((u64)ioread32(davinci_wdt->base + TIM34) << 32);
>> +
>> +    do_div(timer_counter, freq);
>> +
>> +    return wdd->timeout - timer_counter;
>> +}
>> +
>>   static const struct watchdog_info davinci_wdt_info = {
>>       .options = WDIOF_KEEPALIVEPING,
>>       .identity = "DaVinci Watchdog",
>> @@ -127,6 +154,7 @@ static const struct watchdog_ops davinci_wdt_ops = {
>>       .start        = davinci_wdt_start,
>>       .stop        = davinci_wdt_ping,
>>       .ping        = davinci_wdt_ping,
>> +    .get_timeleft    = davinci_wdt_get_timeleft,
>>   };
>>
>>   static int davinci_wdt_probe(struct platform_device *pdev)
>>
>


-- 
Regards,
Ivan Khoronzhuk
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