linux-kernel - Re: [PATCH/RFC v13 07/13] DT: Add documentation for the Skyworks AAT1290

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Date:	Wed, 18 Mar 2015 11:28:17 +0100
From:	Jacek Anaszewski <j.anaszewski@...sung.com>
To:	linux-leds@...r.kernel.org
Cc:	Jacek Anaszewski <j.anaszewski@...sung.com>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, kyungmin.park@...sung.com,
	pavel@....cz, cooloney@...il.com, rpurdie@...ys.net,
	sakari.ailus@....fi, s.nawrocki@...sung.com
Subject: Re: [PATCH/RFC v13 07/13] DT: Add documentation for the Skyworks
 AAT1290

On 03/12/2015 04:45 PM, Jacek Anaszewski wrote:
> This patch adds device tree binding documentation for
> 1.5A Step-Up Current Regulator for Flash LEDs.
>
> Signed-off-by: Jacek Anaszewski <j.anaszewski@...sung.com>
> Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
> Cc: Bryan Wu <cooloney@...il.com>
> Cc: Richard Purdie <rpurdie@...ys.net>
> ---
>   .../devicetree/bindings/leds/leds-aat1290.txt      |   71 ++++++++++++++++++++
>   1 file changed, 71 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/leds/leds-aat1290.txt
>
> diff --git a/Documentation/devicetree/bindings/leds/leds-aat1290.txt b/Documentation/devicetree/bindings/leds/leds-aat1290.txt
> new file mode 100644
> index 0000000..b2a1192
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-aat1290.txt
> @@ -0,0 +1,71 @@
> +* Skyworks Solutions, Inc. AAT1290 Current Regulator for Flash LEDs
> +
> +The device is controlled through two pins: FL_EN and EN_SET. The pins when,
> +asserted high, enable flash strobe and movie mode (max 1/2 of flash current)
> +respectively. In order to add a capability of selecting the strobe signal source
> +(e.g. GPIO or ISP) there is an additional switch required, independent of the
> +flash chip. The switch is controlled with pin control.
> +
> +Required properties:
> +
> +- compatible : Must be "skyworks,aat1290".
> +- flen-gpios : Must be device tree identifier of the flash device FL_EN pin.
> +- enset-gpios : Must be device tree identifier of the flash device EN_SET pin.
> +
> +Optional properties:
> +- pinctrl-names : Must contain entries: "default", "host", "isp". Entries
> +		"default" and "host" must refer to the same pin configuration
> +		node, which sets the host as a strobe signal provider. Entry
> +		"isp" must refer to the pin configuration node, which sets the
> +		ISP as a strobe signal provider.
> +
> +A discrete LED element connected to the device must be represented by a child
> +node - see Documentation/devicetree/bindings/leds/common.txt.
> +
> +Required properties of the LED child node:
> +- flash-max-microamp : Maximum intensity in microamperes of the flash LED -
> +		       it can be calculated using following formula:
> +		       I = 1A * 162kohm / Rset.
> +- flash-timeout-us : Maximum flash timeout in microseconds -
> +		     it can be calculated using following formula:
> +		     T = 8.82 * 10^9 * Ct.
> +
> +Optional properties of the LED child node:
> +- label : see Documentation/devicetree/bindings/leds/common.txt
> +
> +Example (by Ct = 220nF, Rset = 160kohm and exynos4412-trats2 board with
> +a switch that allows for routing strobe signal either from host or from ISP):
> +
> +#include "exynos4412.dtsi"
> +
> +aat1290 {
> +	compatible = "skyworks,aat1290";
> +	gpios = <&gpj1 1 0>, <&gpj1 2 0>;

gpios are here mistake - to be removed.

> +	flen-gpios = <&gpj1 1 GPIO_ACTIVE_HIGH>;
> +	enset-gpios = <&gpj1 2 GPIO_ACTIVE_HIGH>;
> +
> +	pinctrl-names = "default", "host", "isp";
> +	pinctrl-0 = <&camera_flash_host>;
> +	pinctrl-1 = <&camera_flash_host>;
> +	pinctrl-2 = <&camera_flash_isp>;
> +
> +	camera_flash: flash-led {
> +		label = "aat1290-flash";
> +		flash-max-microamp = <1012500>

missing semicolon - will be added in the next version.

> +		flash-timeout-us = <1940000>;
> +	};
> +};
> +
> +&pinctrl_0 {
> +	camera_flash_host: camera-flash-host {
> +		samsung,pins = "gpj1-0";
> +		samsung,pin-function = <1>;
> +		samsung,pin-val = <0>;
> +	};
> +
> +	camera_flash_isp: camera-flash-isp {
> +		samsung,pins = "gpj1-0";
> +		samsung,pin-function = <1>;
> +		samsung,pin-val = <1>;
> +	};
> +};
>


-- 
Best Regards,
Jacek Anaszewski
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