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Date:   Wed, 20 Dec 2017 13:41:51 +0100
From:   Bartosz Golaszewski <>
To:     Andy Shevchenko <>
Cc:     Rob Herring <>,
        Mark Rutland <>,
        Linus Walleij <>,
        Peter Rosin <>,
        linux-i2c <>,
        devicetree <>,
        "" <>
Subject: Re: [PATCH v2 0/2] eeprom: at24: write-protect pin support

2017-12-20 11:21 GMT+01:00 Andy Shevchenko <>:
> On Wed, Dec 20, 2017 at 10:26 AM, 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.
>> This series adds support for the write-protect pin split into two
>> parts. The first patch extends the relevant binding document, while
>> the second modifies the at24 code to pull the write-protect GPIO
>> low (if present) during write operations.
> Reviewed-by: Andy Shevchenko <>
> A one totally minor nit: if it possible now to have one line where
> devm_gpiod_get_optional() is called?
> You may ignore this nit anyway.

Hi Andy,

I'm afraid I don't understand what you mean here. I do use
devm_gpiod_get_optional() in patch 2/2.


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