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Commit 40c8b313 authored by Karthikeyan Mani's avatar Karthikeyan Mani Committed by Gerrit - the friendly Code Review server
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Documentation: sound: Add documentation for slew rate for Kona LPI 



Add documentation for addition of slew rate settings of GPIO in
LPI of kona target.

Change-Id: I93231a0b3857056a2e4b61f60f1d721a8b6b7923
Signed-off-by: default avatarKarthikeyan Mani <kmani@codeaurora.org>
parent 364475ab

Documentation/devicetree/bindings/pinctrl/qcom,lpi-pinctrl.txt

+26 −0
Original line number Diff line number Diff line
@@ -37,6 +37,18 @@ Following properties are for LPI GPIO controller device main node. 
		    The first cell will be used to define gpio number and the

		    second denotes the flags for this gpio.



- #qcom,slew-reg:

	Usage: optional

	Value type: <prop-encoded-array>

	Definition: Register base of the slew register and length.



- #qcom,lpi-slew-offset-tbl:

	Usage: optional

	Value type: <u32-array>

	Definition: Offset table that points to each pin's shift value

		    position in bits in the slew register base for slew

		    settings.



Please refer to ../gpio/gpio.txt for general description of GPIO bindings.



Please refer to pinctrl-bindings.txt in this directory for details of the
@@ -123,12 +135,18 @@ to specify in a pin configuration subnode: 
	Value type: <u32>

	Definition: Selects the drive strength for the specified pins.



- slew-rate:

	Usage: optional

	Value type: <u32>

	Definition: Selects the slew rate for the specified pins.



Example:



	lpi_tlmm: lpi_pinctrl@152c000 {

		compatible = "qcom,lpi-pinctrl";

		qcom,num-gpios = <32>;

		reg = <0x152c000 0>;

		qcom,slew-reg = <0x355a000 0x0>;

		gpio-controller;

		#gpio-cells = <2>;

		qcom,lpi-offset-tbl = <0x00000010>, <0x00000020>,
@@ -142,6 +160,13 @@ Example: 
				<0x00000170>, <0x00000180>,

				<0x00000190>, <0x00000200>,

				<0x00000210>;

		qcom,lpi-slew-offset-tbl = <0x00000000>, <0x00000002>,

				<0x00000004>, <0x00000008>,

				<0x0000000A>, <0x0000000C>,

				<0x00000000>, <0x00000000>,

				<0x00000000>, <0x00000000>,

				<0x00000010>, <0x00000012>,

				<0x00000000>, <0x00000000>;



		hph_comp_active: hph_comp_active {

			mux {
@@ -165,6 +190,7 @@ Example: 
			config {

				pins = "gpio22";

				qcom,drive-strength = <2>;

				slew-rate = <1>;

			};

		};

	};