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Documentation: New DT parameters for tegra30-usb-phy

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Document the new device tree parameters for Tegra30 USB PHY.

Signed-off-by: Tuomas Tynkkynen <ttynkkynen@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Tuomas Tynkkynen 2013-08-12 16:06:52 +03:00 committed by Felipe Balbi
parent 3e635202ce
commit 91e6670002
1 changed files with 12 additions and 3 deletions
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15
Documentation/devicetree/bindings/usb/nvidia,tegra20-usb-phy.txt
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@ -3,7 +3,7 @@ Tegra SOC USB PHY
The device node for Tegra SOC USB PHY:
Required properties :
- compatible : Should be "nvidia,tegra20-usb-phy".
- compatible : Should be "nvidia,tegra<chip>-usb-phy".
- reg : Defines the following set of registers, in the order listed:
- The PHY's own register set.
Always present.
@ -24,17 +24,26 @@ Required properties :
Required properties for phy_type == ulpi:
- nvidia,phy-reset-gpio : The GPIO used to reset the PHY.
Required PHY timing params for utmi phy:
Required PHY timing params for utmi phy, for all chips:
- nvidia,hssync-start-delay : Number of 480 Mhz clock cycles to wait before
start of sync launches RxActive
- nvidia,elastic-limit : Variable FIFO Depth of elastic input store
- nvidia,idle-wait-delay : Number of 480 Mhz clock cycles of idle to wait
before declare IDLE.
- nvidia,term-range-adj : Range adjusment on terminations
- nvidia,xcvr-setup : HS driver output control
- Either one of the following for HS driver output control:
- nvidia,xcvr-setup : integer, uses the provided value.
- nvidia,xcvr-setup-use-fuses : boolean, indicates that the value is read
from the on-chip fuses
If both are provided, nvidia,xcvr-setup-use-fuses takes precedence.
- nvidia,xcvr-lsfslew : LS falling slew rate control.
- nvidia,xcvr-lsrslew : LS rising slew rate control.
Required PHY timing params for utmi phy, only on Tegra30 and above:
- nvidia,xcvr-hsslew : HS slew rate control.
- nvidia,hssquelch-level : HS squelch detector level.
- nvidia,hsdiscon-level : HS disconnect detector level.
Optional properties:
- nvidia,has-legacy-mode : boolean indicates whether this controller can
operate in legacy mode (as APX 2500 / 2600). In legacy mode some