[PATCH 0/2] arm: lpc32xx: restart: add support for soft reset

[Joachim Eastwood]

On 19 February 2016 at 22:24, Sylvain Lemieux <slemieux.tyco at gmail.com> wrote:
> Hi Joachim,
>
>> From: Joachim Eastwood [mailto:manabian at gmail.com]
>> Sent: 18-Feb-16 5:08 PM
>> To: slemieux.tyco at gmail.com
>>
>> Hi Sylvain,
>>
>> On 18 February 2016 at 22:35,  <slemieux.tyco at gmail.com> wrote:
>> > From: Sylvain Lemieux <slemieux at tycoint.com>
>> >
>> > The LPC32xx provide the capability to perform a soft or hard reset;
>> > a soft reset will no reset the external peripheral
>> > (i.e. RESOUT_N output not asserted).
>> >
>> > The default behavior (i.e. hard reset) remain unchanged.
>> >
>> > Sylvain Lemieux (2):
>> >   arm: lpc32xx: restart: add support for soft reset
>> >   arm: lpc32xx: restart: support "cmd" from userspace
>> >
>> >  arch/arm/mach-lpc32xx/common.c | 26 +++++++++++++++++++++++---
>> >  1 file changed, 23 insertions(+), 3 deletions(-)
>>
>> Instead of adding more code to mach-lpc32xx could this code be moved
>> to the watchdog driver (pnx4008_wdt.c) ?
>> See register_restart_handler() and how it's used in other watchdog drivers.
>>
>> Then maybe the restart hook in phy3250.c could be removed all together.
>
> Thanks for the feedback;
>
> It is possible to remove the "lpc23xx_restart" function from "mach-lpc32xx"
> and add the functionality to the pnx4008 watchdog driver.
> The restart hook in phy3250.c can be remove.
>
> I will submit a new revision of the patch on Monday.
>
>>
> I need to add a new functionality to the pnx4008 driver to
> keep the driver disable and only provide the restart hook.

Why do you need to disable the driver?
The watchdog is not enabled unless you don't explicitly do so, ie
opening it and starting it.


> I am planning to add the functionality using a module parameter;
> this is the way the pnx833x & s3c2410 driver are doing it.

You should normally try to avoid module parameters if you can.


> Do you have any feedback before a submit a patch for this change.

Take a look at:
2165bf524da5f5e496d - "watchdog: core: add restart handler support"

Note that this will not give you the reboot_mode parameter. But maybe
that could be added to the restart-callback function.


regards,
Joachim Eastwood