linux-kernel - Re: [PATCH RFC 4/6] net: rfkill: gpio: add device tree support

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Date:	Fri, 17 Jan 2014 17:47:45 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	"Chen-Yu Tsai" <wens@...e.org>,
	Johannes Berg <johannes@...solutions.net>,
	"David S. Miller" <davem@...emloft.net>,
	devicetree@...r.kernel.org, netdev@...r.kernel.org,
	linux-wireless@...r.kernel.org, linux-sunxi@...glegroups.com,
	linux-kernel@...r.kernel.org,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: Re: [PATCH RFC 4/6] net: rfkill: gpio: add device tree support

On Friday 17 January 2014, Chen-Yu Tsai wrote:
> diff --git a/Documentation/devicetree/bindings/rfkill/rfkill-gpio.txt b/Documentation/devicetree/bindings/rfkill/rfkill-gpio.txt
> new file mode 100644
> index 0000000..8a07ea4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rfkill/rfkill-gpio.txt
> @@ -0,0 +1,26 @@
> +GPIO controlled RFKILL devices
> +
> +Required properties:
> +- compatible   : Must be "rfkill-gpio".
> +- rfkill-name  : Name of RFKILL device
> +- rfkill-type  : Type of RFKILL device: 1 for WiFi, 2 for BlueTooth
> +- NAME_shutdown-gpios  : GPIO phandle to shutdown control
> +                         (phandle must be the second)
> +- NAME_reset-gpios     : GPIO phandle to reset control
> +
> +NAME must match the rfkill-name property. NAME_shutdown-gpios or
> +NAME_reset-gpios, or both, must be defined.
> +

I don't understand this part. Why do you include the name in the
gpios property, rather than just hardcoding the property strings
to "shutdown-gpios" and "reset-gpios"?

The description of hte "rfkill-name" property seems to suggest
that you can only have one logical RFKILL device per device node,
so he names would not be ambiguous.

	Arnd
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