linux-kernel - Re: [PATCH v2 1/2] dt-bindings: at24: new optional property

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Message-ID: <20171220214816.wialer7ploqbmfgo@rob-hp-laptop>
Date:   Wed, 20 Dec 2017 15:48:16 -0600
From:   Rob Herring <robh@...nel.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Peter Rosin <peda@...ntia.se>, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: at24: new optional property -
 wp-gpios

On Wed, Dec 20, 2017 at 09:26:32AM +0100, Bartosz Golaszewski wrote:
> AT24 EEPROMs have a write-protect pin, which - when pulled high -
> inhibits writes to the upper quadrant of memory (although it has been
> observed that on some chips it disables writing to the entire memory
> range).
> 
> On some boards, this pin is connected to a GPIO and pulled high by
> default, which forces the user to manually change its state before
> writing. On linux this means that we either need to hog the line all
> the time, or set the GPIO value before writing from outside of the
> at24 driver.
> 
> Add a new optional property to the device tree binding document, which
> allows to specify the GPIO line to which the write-protect pin is
> connected.
> 
> Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
> ---
>  Documentation/devicetree/bindings/eeprom/at24.txt | 3 +++
>  1 file changed, 3 insertions(+)

Reviewed-by: Rob Herring <robh@...nel.org>