[PATCH 1/2] dt: bindings: add new dt entry to indentify external FEM

[Bhagavathi Perumal S <bperumal-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>]

This adds new dt entry ext-fem-name, it is used by ath10k driver
to select correct timing parameters and configure it in target wifi hardware.
The Front End Module(FEM) normally includes tx power amplifier(PA) and
rx low noise amplifier(LNA). The default timing parameters like tx end to
PA off timing values were fine tuned for internal FEM used in reference
design. And these timing values can not be same if ODM modifies hardware
design with different external FEM. This DT entry helps to choose correct
timing values in driver if different external FEM hardware used.

Signed-off-by: Bhagavathi Perumal S <bperumal-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 .../bindings/net/wireless/qcom,ath10k.txt          | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt b/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
index 7fd4e8c..fbaf309 100644
--- a/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
+++ b/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
@@ -56,6 +56,7 @@ Optional properties:
 				     the length can vary between hw versions.
 - <supply-name>-supply: handle to the regulator device tree node
 			   optional "supply-name" is "vdd-0.8-cx-mx".
+- ext-fem-name: name of external front end module used.
 
 Example (to supply the calibration data alone):
 
@@ -150,3 +151,24 @@ wifi@18000000 {
 			   <0 141 0 /* CE11 */ >;
 		vdd-0.8-cx-mx-supply = <&pm8998_l5>;
 };
+
+Example (to supply the external front end module name):
+
+In this example, the front end module is defined as a property of the ath10k
+device node.
+
+pci {
+	pcie@0 {
+		reg = <0 0 0 0 0>;
+		#interrupt-cells = <1>;
+		#size-cells = <2>;
+		#address-cells = <3>;
+		device_type = "pci";
+
+		ath10k@0,0 {
+			reg = <0 0 0 0 0>;
+			device_type = "pci";
+			ext-fem-name = "microsemi-lx5586";
+		};
+	};
+};
-- 
1.9.1