About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Documentation / devicetree / bindings / usb / nvidia,tegra20-usb-phy.txt




Custom Search

Based on kernel version 4.0. Page generated on 2015-04-14 21:23 EST.

1	Tegra SOC USB PHY
2	
3	The device node for Tegra SOC USB PHY:
4	
5	Required properties :
6	 - compatible : For Tegra20, must contain "nvidia,tegra20-usb-phy".
7	   For Tegra30, must contain "nvidia,tegra30-usb-phy".  Otherwise, must contain
8	   "nvidia,<chip>-usb-phy" plus at least one of the above, where <chip> is
9	   tegra114, tegra124, tegra132, or tegra210.
10	 - reg : Defines the following set of registers, in the order listed:
11	   - The PHY's own register set.
12	     Always present.
13	   - The register set of the PHY containing the UTMI pad control registers.
14	     Present if-and-only-if phy_type == utmi.
15	 - phy_type : Should be one of "utmi", "ulpi" or "hsic".
16	 - clocks : Defines the clocks listed in the clock-names property.
17	 - clock-names : The following clock names must be present:
18	   - reg: The clock needed to access the PHY's own registers. This is the
19	     associated EHCI controller's clock. Always present.
20	   - pll_u: PLL_U. Always present.
21	   - timer: The timeout clock (clk_m). Present if phy_type == utmi.
22	   - utmi-pads: The clock needed to access the UTMI pad control registers.
23	     Present if phy_type == utmi.
24	   - ulpi-link: The clock Tegra provides to the ULPI PHY (cdev2).
25	     Present if phy_type == ulpi, and ULPI link mode is in use.
26	 - resets : Must contain an entry for each entry in reset-names.
27	   See ../reset/reset.txt for details.
28	 - reset-names : Must include the following entries:
29	   - usb: The PHY's own reset signal.
30	   - utmi-pads: The reset of the PHY containing the chip-wide UTMI pad control
31	     registers. Required even if phy_type == ulpi.
32	
33	Required properties for phy_type == ulpi:
34	  - nvidia,phy-reset-gpio : The GPIO used to reset the PHY.
35	
36	Required PHY timing params for utmi phy, for all chips:
37	  - nvidia,hssync-start-delay : Number of 480 Mhz clock cycles to wait before
38	    start of sync launches RxActive
39	  - nvidia,elastic-limit : Variable FIFO Depth of elastic input store
40	  - nvidia,idle-wait-delay : Number of 480 Mhz clock cycles of idle to wait
41	    before declare IDLE.
42	  - nvidia,term-range-adj : Range adjusment on terminations
43	  - Either one of the following for HS driver output control:
44	    - nvidia,xcvr-setup : integer, uses the provided value.
45	    - nvidia,xcvr-setup-use-fuses : boolean, indicates that the value is read
46	      from the on-chip fuses
47	    If both are provided, nvidia,xcvr-setup-use-fuses takes precedence.
48	  - nvidia,xcvr-lsfslew : LS falling slew rate control.
49	  - nvidia,xcvr-lsrslew :  LS rising slew rate control.
50	
51	Required PHY timing params for utmi phy, only on Tegra30 and above:
52	  - nvidia,xcvr-hsslew : HS slew rate control.
53	  - nvidia,hssquelch-level : HS squelch detector level.
54	  - nvidia,hsdiscon-level : HS disconnect detector level.
55	
56	Optional properties:
57	  - nvidia,has-legacy-mode : boolean indicates whether this controller can
58	    operate in legacy mode (as APX 2500 / 2600). In legacy mode some
59	    registers are accessed through the APB_MISC base address instead of
60	    the USB controller.
61	  - nvidia,is-wired : boolean. Indicates whether we can do certain kind of power
62	    optimizations for the devices that are always connected. e.g. modem.
63	  - dr_mode : dual role mode. Indicates the working mode for the PHY. Can be
64	    "host", "peripheral", or "otg". Defaults to "host" if not defined.
65	      host means this is a host controller
66	      peripheral means it is device controller
67	      otg means it can operate as either ("on the go")
68	  - nvidia,has-utmi-pad-registers : boolean indicates whether this controller
69	    contains the UTMI pad control registers common to all USB controllers.
70	
71	VBUS control (required for dr_mode == otg, optional for dr_mode == host):
72	  - vbus-supply: regulator for VBUS
Hide Line Numbers
About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Information is copyright its respective author. All material is available from the Linux Kernel Source distributed under a GPL License. This page is provided as a free service by mjmwired.net.