linux-kernel - Re: Is PPC 44x PIKA Warp board still relevant?

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Message-ID: <ed43b0d6-d6d4-73d2-b4ab-637f6d2e310e@csgroup.eu>
Date:   Mon, 26 Sep 2022 06:34:17 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>
CC:     "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ssx@....com" <ssx@....com>
Subject: Re: Is PPC 44x PIKA Warp board still relevant?

Hi Dmitry

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


> 
> 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

> 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 ?

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

Christophe