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Commit c8b71218 authored by Alex Sarraf's avatar Alex Sarraf
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msm: qpnp-haptic: Add Haptic documentation for auto resonance 



Add documentation for auto resonance detection for Linear
Resonance Actuator (LRA), which is a type of vibrator.

Change-Id: Ic53878d3aaabdbfca6d8bbd1646ec2079aecffa8
Signed-off-by: default avatarAlex Sarraf <asarraf@codeaurora.org>
parent 84bfeac2

Documentation/devicetree/bindings/platform/msm/qpnp-haptic.txt

+7 −0
Original line number Original line Diff line number Diff line
@@ -54,6 +54,12 @@ Optional properties when qcom,actuator-type is "lra" 
 - qcom,misc-trim-error-rc19p2-clk-reg-present : boolean, use this if TRIM_ERROR_RC19P2_CLK

 - qcom,misc-trim-error-rc19p2-clk-reg-present : boolean, use this if TRIM_ERROR_RC19P2_CLK

				register is present in MISC module. This register holds

				register is present in MISC module. This register holds

				the frequency error in 19.2Mhz RC clock.

				the frequency error in 19.2Mhz RC clock.

 - qcom,lra-auto-res-mode : auto resonance technique, four different modes

			"none" : no auto resonance

			"zxd" : zero crossing based discontinuous method

			"qwd" : quarter wave drive method

			"max-qwd" : Maximum QWD

			"zxd-eop" : ZXD + End of pattern (This is the Default)





Example:

Example:

		qcom,haptic@c000 {

		qcom,haptic@c000 {
@@ -77,4 +83,5 @@ Example: 
			qcom,wave-samples = [3e 3e 3e 3e 3e 3e 3e 3e];

			qcom,wave-samples = [3e 3e 3e 3e 3e 3e 3e 3e];

			qcom,wave-rep-cnt = <1>;

			qcom,wave-rep-cnt = <1>;

			qcom,wave-samp-rep-cnt = <1>;

			qcom,wave-samp-rep-cnt = <1>;

			qcom,lra-auto-res-mode = "zxd";

		};
 
		};