linux-kernel - Re: [RFC PATCH 0/3] gpio: ep93xx: convert to multi irqchips

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Date:   Sun, 27 Dec 2020 14:55:08 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Nikita Shubin <nikita.shubin@...uefel.me>,
        Hartley Sweeten <hsweeten@...ionengravers.com>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/3] gpio: ep93xx: convert to multi irqchips

Paging Hartley who I think uses this chip.

On Thu, Dec 24, 2020 at 12:22 PM Nikita Shubin
<nikita.shubin@...uefel.me> wrote:

> I was lucky enough to became an owner of some splendid piece's of
> antiques called ts7250 based on the top of Cirrus Logic EP9302.
>
> I don't know what fate expects this hardware (it's not EOL it's just Not
> recommended for new designs) but i wanted to share fixes in ep93xx gpio area.
>
> It seems ep93xx is deadly broken at current state usage of AB gpiochips
> interrupts leads to deadlocks coused by irq_unmask/irq_mask recursions.
>
> Port F is not working at all:

Yeah when I converted this gpio driver I did not have access to a hardware
which made use of port F :(

I used the SIM.One board but they all died on me, then I acquired another
EP93xx board that I just didn't have time to test.

The long term plan is to convert these boards to use device tree and
multiplatform. Interested in the job? ;)

Thanks for fixing up the GPIO chip, let's get the patches in shape and
merge as fixes. Bartosz is handling the fixes right now, I'll try to review too!

Yours,
Linus Walleij