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@@ -19,3 +19,28 @@ audclk
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'audclk:12'
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Select the 12.288MHz clock
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+
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+usb
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+ Specific to boards have USB controller
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+
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+ This option specifies the following for a USB controller:
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+
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+ - which controller mode to use
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+ - which USB PHY to use
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+
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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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+
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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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+
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+ 'phy_type'
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+ Select USB phy type: 'utmi' OR 'ulpi'
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+
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+ 'dr_mode'
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+ Select USB controller mode: 'host', 'peripheral' OR 'otg'
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+
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+ Examples:
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+ usb1:dr_mode=host;usb2:dr_mode=peripheral'
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+
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+ usb1:dr_mode=host,phy_type=utmi;usb2:dr_mode=host'
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