Kernel-4.18.0-80.el8_qcom,mdm9615-pinctrl

Qualcomm MDM9615 TLMM block

This binding describes the Top Level Mode Multiplexer block found in the
MDM9615 platform.

• compatible:
  Usage: required
  Value type:
  Definition: must be “qcom,mdm9615-pinctrl”

• reg:
  Usage: required
  Value type:
  Definition: the base address and size of the TLMM register space.

• interrupts:
  Usage: required
  Value type:
  Definition: should specify the TLMM summary IRQ.

• interrupt-controller:
  Usage: required
  Value type:
  Definition: identifies this node as an interrupt controller

• #interrupt-cells:
  Usage: required
  Value type:
  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:
  Definition: identifies this node as a gpio controller

• #gpio-cells:
  Usage: required
  Value type:
  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:
  Definition: List of gpio pins affected by the properties specified in

        this subnode.  Valid pins are:
        gpio0-gpio87
  

• function:
  Usage: required
  Value type:
  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:
  Definition: The specified pins should be configued as no pull.

• bias-pull-down:
  Usage: optional
  Value type:
  Definition: The specified pins should be configued as pull down.

• bias-pull-up:
  Usage: optional
  Value type:
  Definition: The specified pins should be configued as pull up.

• output-high:
  Usage: optional
  Value type:
  Definition: The specified pins are configured in output mode, driven

        high.
  

• output-low:
  Usage: optional
  Value type:
  Definition: The specified pins are configured in output mode, driven

        low.
  

• drive-strength:
  Usage: optional
  Value type:
  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;
        };
    };
};