linux-kernel - Re: [PATCH v4 2/2] power: reset: document LTC2952 poweroff support

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Date:	Thu, 9 Oct 2014 16:07:56 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Frans Klaver <frans.klaver@...ns.com>
Cc:	Sebastian Reichel <sre@...nel.org>,
	René Moll <linux@...oll.nl>,
	Tjerk Hofmeijer <tjerk.hofmeijer@...ns.com>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Guenter Roeck <linux@...ck-us.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] power: reset: document LTC2952 poweroff support

Hi,

On Thu, Oct 09, 2014 at 03:50:42PM +0100, Frans Klaver wrote:
> From: René Moll <linux@...oll.nl>
> 
> Signed-off-by: René Moll <linux@...oll.nl>
> Signed-off-by: Tjerk Hofmeijer <tjerk.hofmeijer@...ns.com>
> Signed-off-by: Frans Klaver <frans.klaver@...ns.com>
> ---
>  .../bindings/power/reset/ltc2952-poweroff.txt      | 31 ++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/power/reset/ltc2952-poweroff.txt
> 
> diff --git a/Documentation/devicetree/bindings/power/reset/ltc2952-poweroff.txt b/Documentation/devicetree/bindings/power/reset/ltc2952-poweroff.txt
> new file mode 100644
> index 0000000..c3f3d9e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/reset/ltc2952-poweroff.txt
> @@ -0,0 +1,31 @@
> +Binding for the LTC2952 PowerPath controller
> +
> +This chip is used to externally trigger a system shut down. Once the trigger
> +has been sent, the chips watchdog has to be reset to gracefully shut down.

s/chips/chip's/

> If +the Linux systems decides to shut down, it powers off the platform
> via the +poweroff signal.

This sentence can go; the binding should describe the hardware rather
than the Linux behaviour.

Thanks,
Mark.

> +
> +Required properties:
> +
> +- compatible:		Must be: "lltc,ltc2952"
> +- watchdog-gpios:	phandle + gpio-specifier for the GPIO connected to the
> +			chip's watchdog line
> +- poweroff-gpios:	phandle + gpio-specifier for the GPIO connected to the
> +			chip's kill line
> +
> +Optional properties:
> +
> +- trigger-gpios:	phandle + gpio-specifier for the GPIO connected to the
> +			chip's trigger line. If this property is not set, the
> +			trigger function is ignored and the chip is kept alive
> +			until an explicit kill signal is received
> +
> +Example:
> +
> +ltc2952 {
> +	compatible = "lltc,ltc2952";
> +
> +	trigger-gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;
> +	watchdog-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
> +	poweroff-gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
> +};
> -- 
> 2.1.0
> 
> --
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