linux-kernel - Re: [PATCH 2/3] gpio: 104-dio-48e: Add Counter/Timer support

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Message-ID: <CACRpkdYdcU1JNmk7Jyyw+MA+GBKG950P1Nbn7QB4Nx7YJ1jwig@mail.gmail.com>
Date:   Sat, 20 May 2023 21:28:15 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     William Breathitt Gray <william.gray@...aro.org>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org
Subject: Re: [PATCH 2/3] gpio: 104-dio-48e: Add Counter/Timer support

On Sun, Apr 16, 2023 at 7:37 PM William Breathitt Gray
<william.gray@...aro.org> wrote:

> The 104-DIO-48E features an 8254 Counter/Timer chip providing three
> counter/timers which can be used for frequency measurement, frequency
> output, pulse width modulation, pulse width measurement, event count,
> etc. The counter/timers use the same addresses as PPI 0 (addresses 0x0
> to 0x3), so a raw_spinlock_t is used to synchronize operations between
> the two regmap mappings to prevent clobbering.
>
> Signed-off-by: William Breathitt Gray <william.gray@...aro.org>

Very interesting development here.
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij