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bindings: Add USB PHY drivers related documentation

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This change adds QUSB hig-speed PHY driver related
documentation.

Change-Id: I07618a269153d613a2ebb92491267c7fa663f36e
This commit is contained in:
Hiren Gohel
2022-10-11 22:43:46 +05:30
parent 6bd8c158eb
commit 72b89a1dd9
1 changed files with 102 additions and 0 deletions
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102
bindings/usb/qcom,msm-phy.txt
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@@ -160,3 +160,105 @@ Example:
0x2c78 0x27>;
};
QUSB2 High-Speed PHY
Required properties:
- compatible: Should be "qcom,qusb2phy" or "qcom,qusb2phy-v2"
- reg: Address and length of the QUSB2 PHY register set
- reg-names: Should be "qusb_phy_base".
- <supply-name>-supply: phandle to the regulator device tree node
Required supplies are:
"vdd" : vdd supply for digital circuit operation
"vdda18" : 1.8v high-voltage analog supply
"vdda33" : 3.3v high-voltage analog supply
"refgen" : 1.2v high-voltage analog supply
- clocks: a list of phandles to the PHY clocks. Use as per
Documentation/devicetree/bindings/clock/clock-bindings.txt
- clock-names: Names of the clocks in 1-1 correspondence with the "clocks"
property. "ref_clk_src" is a mandatory clock.
- qcom,vdd-voltage-level: This property must be a list of three integer
values (no, min, max) where each value represents either a voltage in
microvolts or a value corresponding to voltage corner
- phy_type: Should be one of "ulpi" or "utmi". ChipIdea core uses "ulpi" mode.
- resets: reset specifier pair consists of phandle for the reset controller
and reset lines used by this controller.
- reset-names: reset signal name strings sorted in the same order as the resets
property.
- qcom,qusb-phy-reg-offset: Provides important phy register offsets in an order defined in phy driver.
Optional properties:
- reg-names: Additional registers corresponding with the following:
"efuse_addr": EFUSE address to read and update analog tune parameter.
"emu_phy_base" : phy base address used for programming emulation target phy.
"ref_clk_addr" : ref_clk bcr address used for on/off ref_clk before reset.
"tcsr_clamp_dig_n" : To enable/disable digital clamp to the phy. When
de-asserted, it will prevent random leakage from qusb2 phy resulting from
out of sequence turn on/off of 1p8, 3p3 and DVDD regulators.
"refgen_north_bg_reg" : address used to read REFGEN status for overriding QUSB PHY register.
"tcsr_conn_box_spare" : To enable/disable USB HS AC/DC coupling feature. When
enabled, DP/DM signals will take path through capacitor when USB HS device is
connected. This is a required property if 'qcom,usb-hs-ac-bitmask' property is present.
- clocks: a list of phandles to the PHY clocks. Use as per
Documentation/devicetree/bindings/clock/clock-bindings.txt
- clock-names: Names of the clocks in 1-1 correspondence with the "clocks"
property. "cfg_ahb_clk" and "ref_clk" are optional clocks.
- qcom,qusb-phy-init-seq: QUSB PHY initialization sequence with value,reg pair.
- qcom,qusb-phy-host-init-seq: QUSB PHY initialization sequence for host mode
with value,reg pair.
- qcom,emu-init-seq : emulation initialization sequence with value,reg pair.
- qcom,phy-pll-reset-seq : emulation PLL reset sequence with value,reg pair.
- qcom,emu-dcm-reset-seq : emulation DCM reset sequence with value,reg pair.
- qcom,tune2-efuse-bit-pos: TUNE2 parameter related start bit position with EFUSE register for "qcom,qusb2phy".
- qcom,tune2-efuse-num-bits: Number of bits based value to use for TUNE2 high nibble for "qcom,qusb2phy".
- qcom,efuse-bit-pos: start bit position within EFUSE register for "qcom,qusb2phy-v2".
- qcom,efuse-num-bits: Number of bits to read from EFUSE register for "qcom,qusb2phy-v2".
- qcom,emulation: Indicates that we are running on emulation platform.
- qcom,hold-reset: Indicates that hold QUSB PHY into reset state.
- qcom,phy-clk-scheme: Should be one of "cml" or "cmos" if ref_clk_addr is provided.
- qcom,major-rev: provide major revision number to differentiate power up sequence. default is 2.0
- pinctrl-names/pinctrl-0/1: The GPIOs configured as output function. Allowed names are
"default" and "sleep".
- qcom,tune2-efuse-correction: The value to be adjusted from fused value for
improved rise/fall times.
- qcom,host-chirp-erratum: Indicates host chirp fix is required.
- qcom,override-bias-ctrl2: Indicates override is done from driver for
BIAS_CTRL2 register.
- nvmem-cells: specifies the handle to represent the SoC revision.
usually it is defined by qfprom device node.
- nvmem-cell-names: specifies the given nvmem cell name as defined in
qfprom node.
- qcom,usb-hs-ac-bitmask: Specifies the polarity and enable bitfields in
tcsr_conn_box_spare register so as to enable USB HS AC/DC coupling feature.
- qcom,usb-hs-ac-value: Specifies the value to be written to polarity and
enable bitfields so as to enable USB HS AC/DC coupling feature. This is a
required property if 'qcom,usb-hs-ac-bitmask' property is present.
Example:
qusb_phy: qusb@f9b39000 {
compatible = "qcom,qusb2phy";
reg = <0x00079000 0x7000>;
reg-names = "qusb_phy_base";
vdd-supply = <&pm8994_s2_corner>;
vdda18-supply = <&pm8994_l6>;
vdda33-supply = <&pm8994_l24>;
refgen-supply = <&pm8994_l21>;
qcom,vdd-voltage-level = <1 5 7>;
qcom,qusb-phy-reg-offset =
<0x240 /* QUSB2PHY_PORT_TUNE1 */
0x1a0 /* QUSB2PHY_PLL_COMMON_STATUS_ONE */
0x210 /* QUSB2PHY_PWR_CTRL1 */
0x230 /* QUSB2PHY_INTR_CTRL */
0x0a8 /* QUSB2PHY_PLL_CORE_INPUT_OVERRIDE */
0x254 /* QUSB2PHY_TEST1 */
0x198>; /* QUSB2PHY_PLL_BIAS_CONTROL_2 */
qcom,efuse-bit-pos = <21>;
qcom,efuse-num-bits = <3>;
clocks = <&clock_rpm clk_ln_bb_clk>,
clock_gcc clk_gcc_rx2_usb1_clkref_clk>,
<&clock_gcc clk_gcc_usb_phy_cfg_ahb2phy_clk>;
clock-names = "ref_clk_src", "ref_clk", "cfg_ahb_clk";
resets = <&clock_gcc GCC_QUSB2PHY_PRIM_BCR>;
reset-names = "phy_reset";
};