Re: [PATCH v4 5/7] Watchdog: introduce ARM SBSA watchdog driver

[Fu Wei]

On 10 June 2015 at 22:22, Timur Tabi <timur@xxxxxxxxxxxxxx> wrote:
> Fu Wei wrote:
>>
>> Another weakness of only using WOR is the timeout limited by this
>> 32bit register.
>> 10s @400MHz generic Timer
>>
>> I don't think this limit is good for a server, once the server is in a
>> heavy load
>
>
> Perhaps, but if that's the limitation of the hardware, then so be it.

it is not the real limitation, if we use WCV, SBSA spec has mentioned that.

------ SBSA 2.3-------Page 23 ----------
Note: the watchdog offset register is 32 bits wide. This gives a
maximum watch period of around 10s at a system
counter frequency of 400MHz. If a larger watch period is required then
the compare value can be programmed
directly into the compare value register
------ SBSA 2.3-------Page 23 ----------

if some hardware doesn't support writing WCV,
that means this hardware is non-standard SBSA watchdog.

>
> --
> Sent by an employee of the Qualcomm Innovation Center, Inc.
> The Qualcomm Innovation Center, Inc. is a member of the
> Code Aurora Forum, hosted by The Linux Foundation.



-- 
Best regards,

Fu Wei
Software Engineer
Red Hat Software (Beijing) Co.,Ltd.Shanghai Branch
Ph: +86 21 61221326(direct)
Ph: +86 186 2020 4684 (mobile)
Room 1512, Regus One Corporate Avenue,Level 15,
One Corporate Avenue,222 Hubin Road,Huangpu District,
Shanghai,China 200021
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/