linux-kernel - Re: [PATCH v2 2/4] nvmem: add support for the write-protect pin

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Message-ID: <CACRpkdZPO+nBA=H0qJUiSq2iA0BDg=n3Ez5wPgnrtLc3MYdpJw@mail.gmail.com>
Date:   Mon, 16 Dec 2019 09:09:52 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Khouloud Touil <ktouil@...libre.com>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        baylibre-upstreaming@...ups.io,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, linux-i2c <linux-i2c@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] nvmem: add support for the write-protect pin

On Tue, Dec 10, 2019 at 4:42 PM Khouloud Touil <ktouil@...libre.com> wrote:

> The write-protect pin handling looks like a standard property that
> could benefit other users if available in the core nvmem framework.
>
> Instead of modifying all the memory drivers to check this pin, make
> the NVMEM subsystem check if the write-protect GPIO being passed
> through the nvmem_config or defined in the device tree and pull it
> low whenever writing to the memory.
>
> There was a suggestion for introducing the gpiodesc from pdata, but
> as pdata is already removed it could be replaced by adding it to
> nvmem_config.
>
> Reference: https://lists.96boards.org/pipermail/dev/2018-August/001056.html
>
> Signed-off-by: Khouloud Touil <ktouil@...libre.com>

This is consistent IMO, we just specify that WP is active high
as in "when it is high, it actively protects against writing", so:
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij