linux-kernel - Re: [PATCH] dt-bindings: pinctrl: mcp23s08: Clarify gpiospec flags cell usage

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Message-ID: <20180416185021.thnxtpvgvsdqvh6q@rob-hp-laptop>
Date:   Mon, 16 Apr 2018 13:50:21 -0500
From:   Rob Herring <robh@...nel.org>
To:     Ricardo Silva <rjpdasilva@...il.com>
Cc:     devicetree@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: pinctrl: mcp23s08: Clarify gpiospec flags
 cell usage

On Wed, Apr 11, 2018 at 10:42:57PM +0100, Ricardo Silva wrote:
> The pinctrl-mcp23s08 driver doesn't provide a specific gpiospec
> of_xlate() function, causing the gpiolib-of's of_gpio_simple_xlate()
> function to be used instead, which takes the gpiospec's second cell as
> the flags specifier according to 'include/dt-bindings/gpio/gpio.h'.
> 
> The pinctrl-mcp23s08 bindings document was mentioning that the flags
> were unused, which is not accurate because values in that second cell
> are indeed used by the gpiolib-of's of_gpio_simple_xlate() for
> configuring the gpio (e.g. its polarity).
> 
> This way, replace the "flags currently unused" reference in the
> dt-bindings document with references to the appropriate files specifying
> the possible flag values and gpiospec description.
> 
> CC: devicetree@...r.kernel.org
> Signed-off-by: Ricardo Silva <rjpdasilva@...il.com>
> ---
>  .../devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt          | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

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