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Specify hwconfig usage for USB mode and phy change Signed-off-by: Ramneek Mehresh <ramneek.mehresh@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
47 lines
1.4 KiB
Plaintext
47 lines
1.4 KiB
Plaintext
Freescale-specific 'hwconfig' options.
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This file documents Freescale-specific key:value pairs for the 'hwconfig'
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option. See README.hwconfig for general information about 'hwconfig'.
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audclk
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Specific to the P1022DS reference board.
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This option specifies which of the two oscillator frequencies should be
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routed to the Wolfson WM8776 codec. The ngPIXIS can be programmed to
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route either a 11.2896MHz or a 12.288MHz clock. The default is
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12.288MHz. This option has two effects. First, the MUX on the board
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will be programmed accordingly. Second, the clock-frequency property
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in the codec node in the device tree will be updated to the correct
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value.
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'audclk:11'
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Select the 11.2896MHz clock
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'audclk:12'
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Select the 12.288MHz clock
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usb
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Specific to boards have USB controller
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This option specifies the following for a USB controller:
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- which controller mode to use
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- which USB PHY to use
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This is used by generic USB device-tree fixup function to update
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modified values of phy type and controller mode.
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Also used for configuring multiple USB controllers such that
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'usbN' (where N is 1, 2, etc. refers to controller no.)
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'phy_type'
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Select USB phy type: 'utmi' OR 'ulpi'
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'dr_mode'
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Select USB controller mode: 'host', 'peripheral' OR 'otg'
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Examples:
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usb1:dr_mode=host;usb2:dr_mode=peripheral'
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usb1:dr_mode=host,phy_type=utmi;usb2:dr_mode=host'
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