| Message ID | 1426175114-14876-8-git-send-email-j.anaszewski@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
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@samsung.com> > Acked-by: Kyungmin Park <kyungmin.park@samsung.com> > Cc: Bryan Wu <cooloney@gmail.com> > Cc: Richard Purdie <rpurdie@rpsys.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>; > + }; > +}; >
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>; + 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> + 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>; + }; +};