Kernel-4.18.0-80.el8_omap-ssi

OMAP SSI controller bindings

OMAP3’s Synchronous Serial Interface (SSI) controller implements a
legacy variant of MIPI’s High Speed Synchronous Serial Interface (HSI),
while the controller found inside OMAP4 is supposed to be fully compliant
with the HSI standard.

Required properties:

• compatible: Should include “ti,omap3-ssi” or “ti,omap4-hsi”
• reg-names: Contains the values “sys” and “gdd” (in this order).
• reg: Contains a matching register specifier for each entry

        in reg-names.
  

• interrupt-names: Contains the value “gdd_mpu”.
• interrupts: Contains matching interrupt information for each entry

        in interrupt-names.
  

• ranges: Represents the bus address mapping between the main

        controller node and the child nodes below.
  

• clock-names: Must include the following entries:
  “ssi_ssr_fck”: The OMAP clock of that name
  “ssi_sst_fck”: The OMAP clock of that name
  “ssi_ick”: The OMAP clock of that name
• clocks: Contains a matching clock specifier for each entry in

        clock-names.
  

• #address-cells: Should be set to <1>
• #size-cells: Should be set to <1>

Each port is represented as a sub-node of the ti,omap3-ssi device.

Required Port sub-node properties:

• compatible: Should be set to the following value

        ti,omap3-ssi-port (applicable to OMAP34xx devices)
        ti,omap4-hsi-port (applicable to OMAP44xx devices)
  

• reg-names: Contains the values “tx” and “rx” (in this order).
• reg: Contains a matching register specifier for each entry

        in reg-names.
  

• interrupt-parent Should be a phandle for the interrupt controller
• interrupts: Should contain interrupt specifiers for mpu interrupts

        0 and 1 (in this order).
  

• ti,ssi-cawake-gpio: Defines which GPIO pin is used to signify CAWAKE

        events for the port. This is an optional board-specific
        property. If it's missing the port will not be
        enabled.
  

Optional properties:

• ti,hwmods: Shall contain TI interconnect module name if needed

        by the SoC
  

Example for Nokia N900:

ssi-controller@48058000 {
compatible = “ti,omap3-ssi”;

/* needed until hwmod is updated to use the compatible string */
ti,hwmods = "ssi";

reg = <0x48058000 0x1000>,
      <0x48059000 0x1000>;
reg-names = "sys",
        "gdd";

interrupts = <55>;
interrupt-names = "gdd_mpu";

clocks = <&ssi_ssr_fck>,
     <&ssi_sst_fck>,
     <&ssi_ick>;
clock-names = "ssi_ssr_fck",
          "ssi_sst_fck",
          "ssi_ick";

#address-cells = <1>;
#size-cells = <1>;
ranges;

ssi-port@4805a000 {
    compatible = "ti,omap3-ssi-port";

    reg = <0x4805a000 0x800>,
          <0x4805a800 0x800>;
    reg-names = "tx",
            "rx";

    interrupt-parent = <&intc>;
    interrupts = <67>,
             <68>;

    ti,ssi-cawake-gpio = <&gpio5 23 GPIO_ACTIVE_HIGH>; /* 151 */
}

ssi-port@4805a000 {
    compatible = "ti,omap3-ssi-port";

    reg = <0x4805b000 0x800>,
          <0x4805b800 0x800>;
    reg-names = "tx",
            "rx";

    interrupt-parent = <&intc>;
    interrupts = <69>,
             <70>;

}

}