Kernel-4.18.0-80.el8_ufshcd-pltfr

• Universal Flash Storage (UFS) Host Controller

UFSHC nodes are defined to describe on-chip UFS host controllers.
Each UFS controller instance should have its own node.

Required properties:

• compatible : must contain “jedec,ufs-1.1” or “jedec,ufs-2.0”, may

          also list one or more of the following:
                  "qcom,msm8994-ufshc"
                  "qcom,msm8996-ufshc"
                  "qcom,ufshc"
  

• interrupts :
• reg :

Optional properties:

• phys : phandle to UFS PHY node

• phy-names : the string “ufsphy” when is found in a node, along

                      with "phys" attribute, provides phandle to UFS PHY node
  

• vdd-hba-supply : phandle to UFS host controller supply regulator node

• vcc-supply : phandle to VCC supply regulator node

• vccq-supply : phandle to VCCQ supply regulator node

• vccq2-supply : phandle to VCCQ2 supply regulator node

• vcc-supply-1p8 : For embedded UFS devices, valid VCC range is 1.7-1.95V

                      or 2.7-3.6V. This boolean property when set, specifies
          to use low voltage range of 1.7-1.95V. Note for external
          UFS cards this property is invalid and valid VCC range is
          always 2.7-3.6V.
  

• vcc-max-microamp : specifies max. load that can be drawn from vcc supply

• vccq-max-microamp : specifies max. load that can be drawn from vccq supply

• vccq2-max-microamp : specifies max. load that can be drawn from vccq2 supply

• -fixed-regulator : boolean property specifying that -supply is a fixed regulator

• clocks : List of phandle and clock specifier pairs

• clock-names : List of clock input name strings sorted in the same

                      order as the clocks property.
  

• freq-table-hz : Array of operating frequencies stored in the same

                      order as the clocks property. If this property is not
          defined or a value in the array is "0" then it is assumed
          that the frequency is set by the parent clock or a
          fixed rate clock source.
  

• lanes-per-direction : number of lanes available per direction - either 1 or 2.

           Note that it is assume same number of lanes is used both
           directions at once. If not specified, default is 2 lanes per direction.
  

Note: If above properties are not defined it can be assumed that the supply
regulators or clocks are always on.

Example:
ufshc@fc598000 {
compatible = “jedec,ufs-1.1”;
reg = <0xfc598000 0x800>;
interrupts = <0 28 0>;

    vdd-hba-supply = <&xxx_reg0>;
    vdd-hba-fixed-regulator;
    vcc-supply = <&xxx_reg1>;
    vcc-supply-1p8;
    vccq-supply = <&xxx_reg2>;
    vccq2-supply = <&xxx_reg3>;
    vcc-max-microamp = 500000;
    vccq-max-microamp = 200000;
    vccq2-max-microamp = 200000;

    clocks = <&core 0>, <&ref 0>, <&iface 0>;
    clock-names = "core_clk", "ref_clk", "iface_clk";
    freq-table-hz = <100000000 200000000>, <0 0>, <0 0>;
    phys = <&ufsphy1>;
    phy-names = "ufsphy";
};