68 lines
2.6 KiB
Plaintext
Executable file
68 lines
2.6 KiB
Plaintext
Executable file
Qualcomm QUSB2 phy controller
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=============================
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QUSB2 controller supports LS/FS/HS usb connectivity on Qualcomm chipsets.
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Required properties:
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- compatible: compatible list, contains
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"qcom,msm8996-qusb2-phy" for 14nm PHY on msm8996,
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"qcom,sdm845-qusb2-phy" for 10nm PHY on sdm845.
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- reg: offset and length of the PHY register set.
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- #phy-cells: must be 0.
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- clocks: a list of phandles and clock-specifier pairs,
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one for each entry in clock-names.
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- clock-names: must be "cfg_ahb" for phy config clock,
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"ref" for 19.2 MHz ref clk,
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"iface" for phy interface clock (Optional).
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- vdda-pll-supply: Phandle to 1.8V regulator supply to PHY refclk pll block.
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- vdda-phy-dpdm-supply: Phandle to 3.1V regulator supply to Dp/Dm port signals.
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- resets: Phandle to reset to phy block.
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Optional properties:
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- nvmem-cells: Phandle to nvmem cell that contains 'HS Tx trim'
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tuning parameter value for qusb2 phy.
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- qcom,tcsr-syscon: Phandle to TCSR syscon register region.
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- qcom,imp-res-offset-value: It is a 6 bit value that specifies offset to be
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added to PHY refgen RESCODE via IMP_CTRL1 register. It is a PHY
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tuning parameter that may vary for different boards of same SOC.
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This property is applicable to only QUSB2 v2 PHY (sdm845).
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- qcom,hstx-trim-value: It is a 4 bit value that specifies tuning for HSTX
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output current.
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Possible range is - 15mA to 24mA (stepsize of 600 uA).
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See dt-bindings/phy/phy-qcom-qusb2.h for applicable values.
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This property is applicable to only QUSB2 v2 PHY (sdm845).
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Default value is 22.2mA for sdm845.
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- qcom,preemphasis-level: It is a 2 bit value that specifies pre-emphasis level.
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Possible range is 0 to 15% (stepsize of 5%).
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See dt-bindings/phy/phy-qcom-qusb2.h for applicable values.
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This property is applicable to only QUSB2 v2 PHY (sdm845).
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Default value is 10% for sdm845.
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- qcom,preemphasis-width: It is a 1 bit value that specifies how long the HSTX
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pre-emphasis (specified using qcom,preemphasis-level) must be in
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effect. Duration could be half-bit of full-bit.
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See dt-bindings/phy/phy-qcom-qusb2.h for applicable values.
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This property is applicable to only QUSB2 v2 PHY (sdm845).
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Default value is full-bit width for sdm845.
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Example:
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hsusb_phy: phy@7411000 {
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compatible = "qcom,msm8996-qusb2-phy";
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reg = <0x7411000 0x180>;
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#phy-cells = <0>;
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clocks = <&gcc GCC_USB_PHY_CFG_AHB2PHY_CLK>,
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<&gcc GCC_RX1_USB2_CLKREF_CLK>,
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clock-names = "cfg_ahb", "ref";
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vdda-pll-supply = <&pm8994_l12>;
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vdda-phy-dpdm-supply = <&pm8994_l24>;
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resets = <&gcc GCC_QUSB2PHY_PRIM_BCR>;
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nvmem-cells = <&qusb2p_hstx_trim>;
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};
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