linux-kernel - Re: [PATCH] Add Altera hardware mutex driver

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Date:   Fri, 1 Apr 2022 16:08:09 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     niravkumar.l.rabara@...el.com
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Derek Kiernan <derek.kiernan@...inx.com>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        Rob Herring <robh+dt@...nel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Add Altera hardware mutex driver

On Thu, Mar 31, 2022 at 11:49 PM <niravkumar.l.rabara@...el.com> wrote:
>
> From: Niravkumar L Rabara <niravkumar.l.rabara@...el.com>
>
> Altera hardware mutex soft IP provides hardware assistance for
> synchronization and mutual exclusion between processors in
> asymmetric/symmetric multiprocessing (AMP/SMP) system or
> multi processes/threads in uniprocessor system.
>
> Signed-off-by: Niravkumar L Rabara <niravkumar.l.rabara@...el.com>
> ---
>  .../bindings/misc/altera-hwmutex.yaml         |  47 +++
>  drivers/misc/Kconfig                          |   6 +
>  drivers/misc/Makefile                         |   1 +
>  drivers/misc/altera_hwmutex.c                 | 321 ++++++++++++++++++
>  include/linux/altera_hwmutex.h                |  42 +++

Why does this use a custom interface rather than the generic drivers/hwspinlock/
subsystem?

        Arnd