[PATCH 1/2] dt-bindings: leds: document new usb-ports property

["Rafał Miłecki" <zajec5-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

From: Rafał Miłecki <rafal-g1n6cQUeyibVItvQsEIGlw@public.gmane.org>

Some LEDs can be related to particular USB ports (common case for home
routers). This property allows describing such a relation.

Signed-off-by: Rafał Miłecki <rafal-g1n6cQUeyibVItvQsEIGlw@public.gmane.org>
---
This patch is based on top of commit 52e847dc431 ("DT: leds: Improve examples
by adding some context") sitting in the linux-leds.git (for-4.11).
---
 Documentation/devicetree/bindings/leds/common.txt | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt
index 24b6560..fcfe661 100644
--- a/Documentation/devicetree/bindings/leds/common.txt
+++ b/Documentation/devicetree/bindings/leds/common.txt
@@ -49,6 +49,14 @@ Optional properties for child nodes:
 - panic-indicator : This property specifies that the LED should be used,
 		    if at all possible, as a panic indicator.
 
+- usb-ports : List of USB ports related to this LED. Some devices have LEDs that
+	      should be used to indicate USB device activity. This can be
+	      described with this property.
+	      There can be more than one LED like this, e.g. some vendors use
+	      one controller per USB version. It's then common to use different
+	      color LEDs depending on device USB standard (like USB 2.0 vs.
+	      USB 3.0).
+
 Required properties for flash LED child nodes:
 - flash-max-microamp : Maximum flash LED supply current in microamperes.
 - flash-max-timeout-us : Maximum timeout in microseconds after which the flash
@@ -69,6 +77,11 @@ gpio-leds {
 		linux,default-trigger = "heartbeat";
 		gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>;
 	};
+
+	usb {
+		gpios = <&gpio0 1 GPIO_ACTIVE_HIGH>;
+		usb-ports = <&ohci_port1>, <&ehci_port1>;
+	};
 };
 
 max77693-led {
-- 
2.10.1

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