This patch adds device tree binding documentation for 1.5A Step-Up Current Regulator for Flash LEDs. Signed-off-by: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx> Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> Cc: Bryan Wu <cooloney@xxxxxxxxx> Cc: Richard Purdie <rpurdie@xxxxxxxxx> --- .../devicetree/bindings/leds/leds-aat1290.txt | 64 ++++++++++++++++++++ 1 file changed, 64 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..4f3583d --- /dev/null +++ b/Documentation/devicetree/bindings/leds/leds-aat1290.txt @@ -0,0 +1,64 @@ +* 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. + +Required properties: + +- compatible : Must be "skyworks,aat1290". +- gpios : Two gpio pins in order FLEN, EN/SET + +Optional properties: +- pinctrl-names : Must contain entries: "default", "host", "isp". Entries + "default" and "host" must refer to the same pin configration + node, which sets the strobe signal source to host. Entry "isp" + must refer to the pin configuration node, which sets the strobe + signal source to ISP. + +The LED 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: +- label : see Documentation/devicetree/bindings/leds/common.txt +- 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. + +Example (by Ct = 220nF, Rset = 160kohm and exynos4412-trats2 board with a +switch that allows for routing the strobe source signal either from host or +from ISP): + +aat1290 { + compatible = "skyworks,aat1290"; + gpios = <&gpj1 1 0>, <&gpj1 2 0>; + 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> + 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>; + }; +}; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html