linux-arkmicro/linux/Documentation/devicetree/bindings/pinctrl/qcom,ipq8074-pinctrl.txt

Qualcomm Technologies, Inc. IPQ8074 TLMM block

This binding describes the Top Level Mode Multiplexer block found in the
IPQ8074 platform.

- compatible:
	Usage: required
	Value type: <string>
	Definition: must be "qcom,ipq8074-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-gpio69

- function:
	Usage: required
	Value type: <string>
	Definition: Specify the alternative function to be configured for the
		    specified pins. Functions are only valid for gpio pins.
		    Valid values are:
		    atest_char, atest_char0, atest_char1, atest_char2,
		    atest_char3, audio_rxbclk, audio_rxd, audio_rxfsync,
		    audio_rxmclk, audio_txbclk, audio_txd, audio_txfsync,
		    audio_txmclk, blsp0_i2c, blsp0_spi, blsp0_uart, blsp1_i2c,
		    blsp1_spi, blsp1_uart, blsp2_i2c, blsp2_spi, blsp2_uart,
		    blsp3_i2c, blsp3_spi, blsp3_spi0, blsp3_spi1, blsp3_spi2,
		    blsp3_spi3, blsp3_uart, blsp4_i2c0, blsp4_i2c1, blsp4_spi0,
		    blsp4_spi1, blsp4_uart0, blsp4_uart1, blsp5_i2c, blsp5_spi,
		    blsp5_uart, burn0, burn1, cri_trng, cri_trng0, cri_trng1,
		    cxc0, cxc1, dbg_out, gcc_plltest, gcc_tlmm, gpio, ldo_en,
		    ldo_update, led0, led1, led2, mac0_sa0, mac0_sa1, mac1_sa0,
		    mac1_sa1, mac1_sa2, mac1_sa3, mac2_sa0, mac2_sa1, mdc,
		    mdio, pcie0_clk, pcie0_rst, pcie0_wake, pcie1_clk,
		    pcie1_rst, pcie1_wake, pcm_drx, pcm_dtx, pcm_fsync,
		    pcm_pclk, pcm_zsi0, pcm_zsi1, prng_rosc, pta1_0, pta1_1,
		    pta1_2, pta2_0, pta2_1, pta2_2, pwm0, pwm1, pwm2, pwm3,
		    qdss_cti_trig_in_a0, qdss_cti_trig_in_a1,
		    qdss_cti_trig_in_b0, qdss_cti_trig_in_b1,
		    qdss_cti_trig_out_a0, qdss_cti_trig_out_a1,
		    qdss_cti_trig_out_b0, qdss_cti_trig_out_b1,
		    qdss_traceclk_a, qdss_traceclk_b, qdss_tracectl_a,
		    qdss_tracectl_b, qdss_tracedata_a, qdss_tracedata_b,
		    qpic, rx0, rx1, rx2, sd_card, sd_write, tsens_max, wci2a,
		    wci2b, wci2c, wci2d

- 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:

	tlmm: pinctrl@1000000 {
		compatible = "qcom,ipq8074-pinctrl";
		reg = <0x1000000 0x300000>;
		interrupts = <GIC_SPI 208 IRQ_TYPE_LEVEL_HIGH>;
		gpio-controller;
		#gpio-cells = <2>;
		gpio-ranges = <&tlmm 0 0 70>;
		interrupt-controller;
		#interrupt-cells = <2>;

		uart2: uart2-default {
			mux {
				pins = "gpio23", "gpio24";
				function = "blsp4_uart1";
			};

			rx {
				pins = "gpio23";
				drive-strength = <4>;
				bias-disable;
			};

			tx {
				pins = "gpio24";
				drive-strength = <2>;
				bias-pull-up;
			};
		};
	};