linux-kernel - Re: [PATCH 0/2] eeprom: at24: write-protect pin support

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Date:   Wed, 20 Dec 2017 09:27:17 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Peter Rosin <peda@...ntia.se>
Cc:     linux-i2c <linux-i2c@...r.kernel.org>, devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <brgl@...ev.pl>
Subject: Re: [PATCH 0/2] eeprom: at24: write-protect pin support

2017-12-19 17:14 GMT+01:00 Bartosz Golaszewski <brgl@...ev.pl>:
> 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.
>
> Bartosz Golaszewski (2):
>   dt-bindings: at24: new optional property - write-protect-gpios
>   eeprom: at24: add support for the write-protect pin
>
>  Documentation/devicetree/bindings/eeprom/at24.txt |  4 ++++
>  drivers/misc/eeprom/at24.c                        | 12 ++++++++++++
>  2 files changed, 16 insertions(+)
>
> --
> 2.15.1
>

Superseded by v2.

Thanks,
Bartosz