DT: aat1290: Document handling external strobe sources

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>

1 files changed, 34 insertions, 2 deletions

diff --git a/Documentation/devicetree/bindings/leds/leds-aat1290.txt b/Documentation/devicetree/bindings/leds/leds-aat1290.txt
index ef88b9c53e37..c05ed91a4e42 100644
--- a/Documentation/devicetree/bindings/leds/leds-aat1290.txt
+++ b/Documentation/devicetree/bindings/leds/leds-aat1290.txt
@@ -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>;
+        };
+};