1Qualcomm QUSB2 phy controller
2=============================
3
4QUSB2 controller supports LS/FS/HS usb connectivity on Qualcomm chipsets.
5
6Required properties:
7 - compatible: compatible list, contains
8	       "qcom,msm8996-qusb2-phy" for 14nm PHY on msm8996,
9	       "qcom,msm8998-qusb2-phy" for 10nm PHY on msm8998,
10	       "qcom,sdm845-qusb2-phy" for 10nm PHY on sdm845.
11
12 - reg: offset and length of the PHY register set.
13 - #phy-cells: must be 0.
14
15 - clocks: a list of phandles and clock-specifier pairs,
16	   one for each entry in clock-names.
17 - clock-names: must be "cfg_ahb" for phy config clock,
18			"ref" for 19.2 MHz ref clk,
19			"iface" for phy interface clock (Optional).
20
21 - vdda-pll-supply: Phandle to 1.8V regulator supply to PHY refclk pll block.
22 - vdda-phy-dpdm-supply: Phandle to 3.1V regulator supply to Dp/Dm port signals.
23
24 - resets: Phandle to reset to phy block.
25
26Optional properties:
27 - nvmem-cells: Phandle to nvmem cell that contains 'HS Tx trim'
28		tuning parameter value for qusb2 phy.
29
30 - qcom,tcsr-syscon: Phandle to TCSR syscon register region.
31 - qcom,imp-res-offset-value: It is a 6 bit value that specifies offset to be
32		added to PHY refgen RESCODE via IMP_CTRL1 register. It is a PHY
33		tuning parameter that may vary for different boards of same SOC.
34		This property is applicable to only QUSB2 v2 PHY (sdm845).
35 - qcom,hstx-trim-value: It is a 4 bit value that specifies tuning for HSTX
36		output current.
37		Possible range is - 15mA to 24mA (stepsize of 600 uA).
38		See dt-bindings/phy/phy-qcom-qusb2.h for applicable values.
39		This property is applicable to only QUSB2 v2 PHY (sdm845).
40		Default value is 22.2mA for sdm845.
41 - qcom,preemphasis-level: It is a 2 bit value that specifies pre-emphasis level.
42		Possible range is 0 to 15% (stepsize of 5%).
43		See dt-bindings/phy/phy-qcom-qusb2.h for applicable values.
44		This property is applicable to only QUSB2 v2 PHY (sdm845).
45		Default value is 10% for sdm845.
46- qcom,preemphasis-width: It is a 1 bit value that specifies how long the HSTX
47		pre-emphasis (specified using qcom,preemphasis-level) must be in
48		effect. Duration could be half-bit of full-bit.
49		See dt-bindings/phy/phy-qcom-qusb2.h for applicable values.
50		This property is applicable to only QUSB2 v2 PHY (sdm845).
51		Default value is full-bit width for sdm845.
52
53Example:
54	hsusb_phy: phy@7411000 {
55		compatible = "qcom,msm8996-qusb2-phy";
56		reg = <0x7411000 0x180>;
57		#phy-cells = <0>;
58
59		clocks = <&gcc GCC_USB_PHY_CFG_AHB2PHY_CLK>,
60			<&gcc GCC_RX1_USB2_CLKREF_CLK>,
61		clock-names = "cfg_ahb", "ref";
62
63		vdda-pll-supply = <&pm8994_l12>;
64		vdda-phy-dpdm-supply = <&pm8994_l24>;
65
66		resets = <&gcc GCC_QUSB2PHY_PRIM_BCR>;
67		nvmem-cells = <&qusb2p_hstx_trim>;
68        };
69