linux-kernel - Re: [PATCH v4 1/5] dt-bindings: nvmem: new optional property wp-gpios

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Date:   Wed, 8 Jan 2020 14:54:01 -0600
From:   Rob Herring <robh@...nel.org>
To:     Khouloud Touil <ktouil@...libre.com>
Cc:     bgolaszewski@...libre.com, robh+dt@...nel.org,
        mark.rutland@....com, srinivas.kandagatla@...aro.org,
        baylibre-upstreaming@...ups.io, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-i2c@...r.kernel.org,
        linus.walleij@...aro.org, Khouloud Touil <ktouil@...libre.com>
Subject: Re: [PATCH v4 1/5] dt-bindings: nvmem: new optional property wp-gpios

On Tue,  7 Jan 2020 10:29:18 +0100, Khouloud Touil wrote:
> Several memories have a write-protect pin, that when pulled high, it
> blocks the write operation.
> 
> 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.
> 
> 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.
> 
> 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: Khouloud Touil <ktouil@...libre.com>
> ---
>  Documentation/devicetree/bindings/nvmem/nvmem.yaml | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 

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