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DT: aat1290: Document handling external strobe sources

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This patch adds documentation for a pinctrl-names property.
The property, when present, is used for switching the source
of the strobe signal for the device.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Bryan Wu <cooloney@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: devicetree@vger.kernel.org
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Jacek Anaszewski 2015-06-08 02:02:21 -07:00 committed by Bryan Wu
parent 0b380186a5
commit 8bdc89390e
1 changed files with 34 additions and 2 deletions
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36
Documentation/devicetree/bindings/leds/leds-aat1290.txt
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@ -2,7 +2,9 @@
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.
respectively. In order to add a capability of selecting the strobe signal source
(e.g. CPU or camera sensor) there is an additional switch required, independent
of the flash chip. The switch is controlled with pin control.
Required properties:
@ -10,6 +12,13 @@ Required properties:
- 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.
@ -25,13 +34,22 @@ Required properties of the LED child node:
Optional properties of the LED child node:
- label : see Documentation/devicetree/bindings/leds/common.txt
Example (by Ct = 220nF, Rset = 160kohm):
Example (by Ct = 220nF, Rset = 160kohm and exynos4412-trats2 board with
a switch that allows for routing strobe signal either from the host or from
the camera sensor):
#include "exynos4412.dtsi"
aat1290 {
compatible = "skyworks,aat1290";
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";
led-max-microamp = <520833>;
@ -39,3 +57,17 @@ aat1290 {
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>;
};
};