dt-bindings: pinctrl: Add MDM9615 TLMM bindings

Qualcomm MDM9615 TLMM block

This binding describes the Top Level Mode Multiplexer block found in the

MDM9615 platform.

- compatible:

	Usage: required

	Value type: <string>

	Definition: must be "qcom,mdm9615-pinctrl"

- reg:

	Usage: required

	Value type: <prop-encoded-array>

	Definition: the base address and size of the TLMM register space.

- interrupts:

	Usage: required

	Value type: <prop-encoded-array>

	Definition: should specify the TLMM summary IRQ.

- interrupt-controller:

	Usage: required

	Value type: <none>

	Definition: identifies this node as an interrupt controller

- #interrupt-cells:

	Usage: required

	Value type: <u32>

	Definition: must be 2. Specifying the pin number and flags, as defined

		    in <dt-bindings/interrupt-controller/irq.h>

- gpio-controller:

	Usage: required

	Value type: <none>

	Definition: identifies this node as a gpio controller

- #gpio-cells:

	Usage: required

	Value type: <u32>

	Definition: must be 2. Specifying the pin number and flags, as defined

		    in <dt-bindings/gpio/gpio.h>

Please refer to ../gpio/gpio.txt and ../interrupt-controller/interrupts.txt for

a general description of GPIO and interrupt bindings.

Please refer to pinctrl-bindings.txt in this directory for details of the

common pinctrl bindings used by client devices, including the meaning of the

phrase "pin configuration node".

The pin configuration nodes act as a container for an arbitrary number of

subnodes. Each of these subnodes represents some desired configuration for a

pin, a group, or a list of pins or groups. This configuration can include the

mux function to select on those pin(s)/group(s), and various pin configuration

parameters, such as pull-up, drive strength, etc.

PIN CONFIGURATION NODES:

The name of each subnode is not important; all subnodes should be enumerated

and processed purely based on their content.

Each subnode only affects those parameters that are explicitly listed. In

other words, a subnode that lists a mux function but no pin configuration

parameters implies no information about any pin configuration parameters.

Similarly, a pin subnode that describes a pullup parameter implies no

information about e.g. the mux function.

The following generic properties as defined in pinctrl-bindings.txt are valid

to specify in a pin configuration subnode:

- pins:

	Usage: required

	Value type: <string-array>

	Definition: List of gpio pins affected by the properties specified in

		    this subnode.  Valid pins are:

		    gpio0-gpio87

- function:

	Usage: required

	Value type: <string>

	Definition: Specify the alternative function to be configured for the

		    specified pins.

		    Valid values are:

		    gpio, gsbi2_i2c, gsbi3, gsbi4, gsbi5_i2c, gsbi5_uart,

		    sdc2, ebi2_lcdc, ps_hold, prim_audio, sec_audio,

		    cdc_mclk

- bias-disable:

	Usage: optional

	Value type: <none>

	Definition: The specified pins should be configued as no pull.

- bias-pull-down:

	Usage: optional

	Value type: <none>

	Definition: The specified pins should be configued as pull down.

- bias-pull-up:

	Usage: optional

	Value type: <none>

	Definition: The specified pins should be configued as pull up.

- output-high:

	Usage: optional

	Value type: <none>

	Definition: The specified pins are configured in output mode, driven

		    high.

- output-low:

	Usage: optional

	Value type: <none>

	Definition: The specified pins are configured in output mode, driven

		    low.

- drive-strength:

	Usage: optional

	Value type: <u32>

	Definition: Selects the drive strength for the specified pins, in mA.

		    Valid values are: 2, 4, 6, 8, 10, 12, 14 and 16

Example:

	msmgpio: pinctrl@800000 {

		compatible = "qcom,mdm9615-pinctrl";

		reg = <0x800000 0x4000>;

		gpio-controller;

		#gpio-cells = <2>;

		interrupt-controller;

		#interrupt-cells = <2>;

		interrupts = <0 16 0x4>;

		gsbi8_uart: gsbi8-uart {

			mux {

				pins = "gpio34", "gpio35";

				function = "gsbi8";

			};

			tx {

				pins = "gpio34";

				drive-strength = <4>;

				bias-disable;

			};

			rx {

				pins = "gpio35";

				drive-strength = <2>;

				bias-pull-up;

			};

		};

	};