linux-kernel - Re: [RFC v2 06/11] gpiolib: Add HTE support

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Message-ID: <CACRpkdZCLe2cNiJRDzSvUFN+7qzV5kQnfkys4js9pDksYtAT9A@mail.gmail.com>
Date:   Mon, 4 Oct 2021 00:01:29 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Dipen Patel <dipenp@...dia.com>
Cc:     "thierry.reding@...il.com" <thierry.reding@...il.com>,
        Jon Hunter <jonathanh@...dia.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-tegra <linux-tegra@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Kent Gibson <warthog618@...il.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [RFC v2 06/11] gpiolib: Add HTE support

On Fri, Oct 1, 2021 at 1:26 AM Dipen Patel <dipenp@...dia.com> wrote:

> Some GPIO chip can provide hardware timestamp support on its GPIO lines
> , in order to support that additional API needs to be added which
> can talk to both GPIO chip and HTE (hardware timestamping engine)
> subsystem. This patch introduces APIs which gpio consumer can use
> to request hardware assisted timestamping. Below is the list of the APIs
> that are added in gpiolib subsystem.
>
> - gpiod_req_hw_timestamp_ns - Request HTE on specified GPIO line.
> - gpiod_rel_hw_timestamp_ns - Release HTE functionality on GPIO line.
>
> Signed-off-by: Dipen Patel <dipenp@...dia.com>
> ---
> Changes in v2:
> - removed get timestamp and is timestamp enabled APIs

Pretty straight forward IMO
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij