linux-kernel - Re: [PATCH v3 1/6] binding-doc: power: pwrseq-generic: add binding doc for generic power sequence library

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Message-ID: <20160729210943.GA2200@rob-hp-laptop>
Date:	Fri, 29 Jul 2016 16:09:43 -0500
From:	Rob Herring <robh@...nel.org>
To:	Peter Chen <peter.chen@....com>
Cc:	gregkh@...uxfoundation.org, stern@...land.harvard.edu,
	ulf.hansson@...aro.org, broonie@...nel.org, sre@...nel.org,
	shawnguo@...nel.org, dbaryshkov@...il.com, dwmw2@...radead.org,
	k.kozlowski@...sung.com, linux-arm-kernel@...ts.infradead.org,
	p.zabel@...gutronix.de, devicetree@...r.kernel.org,
	pawel.moll@....com, mark.rutland@....com,
	linux-usb@...r.kernel.org, arnd@...db.de, s.hauer@...gutronix.de,
	mail@...iej.szmigiero.name, troy.kisky@...ndarydevices.com,
	festevam@...il.com, oscar@...andei.net, stephen.boyd@...aro.org,
	linux-pm@...r.kernel.org, stillcompiling@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/6] binding-doc: power: pwrseq-generic: add binding
 doc for generic power sequence library

On Wed, Jul 20, 2016 at 05:40:24PM +0800, Peter Chen wrote:
> Add binding doc for generic power sequence library.
> 
> Signed-off-by: Peter Chen <peter.chen@....com>
> Acked-by: Philipp Zabel <p.zabel@...gutronix.de>
> ---
>  .../bindings/power/pwrseq/pwrseq-generic.txt       | 48 ++++++++++++++++++++++
>  1 file changed, 48 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt

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

> 
> diff --git a/Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt b/Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt
> new file mode 100644
> index 0000000..48bb3e1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt
> @@ -0,0 +1,48 @@
> +The generic power sequence library
> +
> +Some hard-wired devices (eg USB/MMC) need to do power sequence before
> +the device can be enumerated on the bus, the typical power sequence
> +like: enable USB PHY clock, toggle reset pin, etc. But current
> +Linux device driver lacks of such code to do it, it may cause some
> +hard-wired devices works abnormal or can't be recognized by
> +controller at all. The power sequence will be done before this device
> +can be found at the bus.
> +
> +The power sequence properties is under the device node.
> +
> +Optional properties:
> +- clocks: the input clock for device.
> +- reset-gpios: Should specify the GPIO for reset.
> +- reset-duration-us: the duration in microsecond for assert reset signal.
> +
> +Below is the example of USB power sequence properties on USB device
> +nodes which have two level USB hubs.
> +
> +&usbotg1 {
> +	vbus-supply = <&reg_usb_otg1_vbus>;
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_usb_otg1_id>;
> +	status = "okay";
> +
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +	genesys: hub@1 {
> +		compatible = "usb5e3,608";
> +		reg = <1>;
> +
> +		clocks = <&clks IMX6SX_CLK_CKO>;
> +		reset-gpios = <&gpio4 5 GPIO_ACTIVE_LOW>; /* hub reset pin */
> +		reset-duration-us = <10>;
> +
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		asix: ethernet@1 {
> +			compatible = "usbb95,1708";
> +			reg = <1>;
> +
> +			clocks = <&clks IMX6SX_CLK_IPG>;
> +			reset-gpios = <&gpio4 6 GPIO_ACTIVE_LOW>; /* ethernet_rst */
> +			reset-duration-us = <15>;
> +		};
> +	};
> +};
> -- 
> 1.9.1
>