Christophe Leroy [off-list ref] writes:

Hi Dmitry

Le 25/09/2022 à 07:06, Dmitry Torokhov a écrit :

quoted

Hi Michael, Nick,

I was wondering if PIKA Warp board still relevant. The reason for my
question is that I am interested in dropping legacy gpio APIs,
especially OF-specific ones, in favor of newer gpiod APIs, and
arch/powerpc/platforms/44x/warp.c is one of few users of it.

As far as I can see, that board is still being sold, see

https://www.voipon.co.uk/pika-warp-asterisk-appliance-p-932.html

On the other hand it looks like PIKA technologies went bankrupt earlier
this year.

quoted

The code in question is supposed to turn off green led and flash red led
in case of overheating, and is doing so by directly accessing GPIOs
owned by led-gpio driver without requesting/allocating them. This is not
really supported with gpiod API, and is not a good practice in general.

As far as I can see, it was ported to led-gpio by

ba703e1a7a0b powerpc/4xx: Have Warp take advantage of GPIO LEDs 
default-state = keep
805e324b7fbd powerpc: Update Warp to use leds-gpio driver

quoted

Before I spend much time trying to implement a replacement without
access to the hardware, I wonder if this board is in use at all, and if
it is how important is the feature of flashing red led on critical
temperature shutdown?

Don't know who can tell it ?

I would be surprised if anyone is still running upstream kernels on it.

I can't find any sign of any activity on the mailing list related to it
since it was initially merged.

Maybe let's perform a more standard implementation is see if anybody 
screams ?

How much work is it to convert it?

Flashing a LED when the machine dies is nice, but not exactly critical,
hopefully the machine *isn't* dying that often :)

cheers