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

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Message-ID: <CAHp75VfJ_3XKhFeQv9h0QDeeS4TrNH0aKUXUD3BBff0xUCAf0Q@mail.gmail.com>
Date:   Sat, 26 Dec 2020 19:34:26 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Nikita Shubin <nikita.shubin@...uefel.me>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/3] gpio: ep93xx: convert to multi irqchips

On Thu, Dec 24, 2020 at 1:24 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.

I personally consider it quite nice to have support even for outdated
hardware (reminds me about a recent LWN article about 32-bit
architectures and a comment there how it could affect the environment
if we drop them from being supported).

So I fully support this series.

-- 
With Best Regards,
Andy Shevchenko