alistair23-linux/Documentation/devicetree/bindings/pinctrl/qcom,mdm9615-pinctrl.txt

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>

- gpio-ranges:
	Usage: required
	Definition:  see ../gpio/gpio.txt

- gpio-reserved-ranges:
	Usage: optional
	Definition: see ../gpio/gpio.txt

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>;
		gpio-ranges = <&msmgpio 0 0 88>;
		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;
			};
		};
	};