xref: /kernel/linux/linux-5.10/Documentation/devicetree/bindings/phy/phy-cadence-sierra.txt

Cadence Sierra PHY
-----------------------

Required properties:
- compatible:	Must be "cdns,sierra-phy-t0" for Sierra in Cadence platform
		Must be "ti,sierra-phy-t0" for Sierra in TI's J721E SoC.
- resets:	Must contain an entry for each in reset-names.
		See ../reset/reset.txt for details.
- reset-names:	Must include "sierra_reset" and "sierra_apb".
		"sierra_reset" must control the reset line to the PHY.
		"sierra_apb" must control the reset line to the APB PHY
		interface ("sierra_apb" is optional).
- reg:		register range for the PHY.
- #address-cells: Must be 1
- #size-cells:	Must be 0

Optional properties:
- clocks:		Must contain an entry in clock-names.
			See ../clocks/clock-bindings.txt for details.
- clock-names:		Must contain "cmn_refclk_dig_div" and
			"cmn_refclk1_dig_div" for configuring the frequency of
			the clock to the lanes. "phy_clk" is deprecated.
- cdns,autoconf:	A boolean property whose presence indicates that the
			PHY registers will be configured by hardware. If not
			present, all sub-node optional properties must be
			provided.

Sub-nodes:
  Each group of PHY lanes with a single master lane should be represented as
  a sub-node. Note that the actual configuration of each lane is determined by
  hardware strapping, and must match the configuration specified here.

Sub-node required properties:
- #phy-cells:	Generic PHY binding; must be 0.
- reg:		The master lane number.  This is the lowest numbered lane
		in the lane group.
- resets:	Must contain one entry which controls the reset line for the
		master lane of the sub-node.
		See ../reset/reset.txt for details.

Sub-node optional properties:
- cdns,num-lanes:	Number of lanes in this group.  From 1 to 4.  The
			group is made up of consecutive lanes.
- cdns,phy-type:	Can be PHY_TYPE_PCIE or PHY_TYPE_USB3, depending on
			configuration of lanes.

Example:
	pcie_phy4: pcie-phy@fd240000 {
		compatible = "cdns,sierra-phy-t0";
		reg = <0x0 0xfd240000 0x0 0x40000>;
		resets = <&phyrst 0>, <&phyrst 1>;
		reset-names = "sierra_reset", "sierra_apb";
		clocks = <&phyclock>;
		clock-names = "phy_clk";
		#address-cells = <1>;
		#size-cells = <0>;
		pcie0_phy0: pcie-phy@0 {
				reg = <0>;
				resets = <&phyrst 2>;
				cdns,num-lanes = <2>;
				#phy-cells = <0>;
				cdns,phy-type = <PHY_TYPE_PCIE>;
		};
		pcie0_phy1: pcie-phy@2 {
				reg = <2>;
				resets = <&phyrst 4>;
				cdns,num-lanes = <1>;
				#phy-cells = <0>;
				cdns,phy-type = <PHY_TYPE_PCIE>;
		};