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USB: xhci: add support for PWRON active high

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Some PCIe-to-USB controllers such as TI's TUSB73x0 3.0 xHCI host
controller supports controlling the PWRONx polarity via the USB control
register (E0h). Add support for device tree property
ti,pwron-active-high which indicates PWRONx to be active high and
configure the E0h register accordingly.  This enables the software
control for the TUSB73x0's PWRONx outputs with an inverted polarity from
the default configuration which could be used as USB EN signals for the
other hubs or devices.

Signed-off-by: Parth Pancholi <parth.pancholi@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://lore.kernel.org/r/20241029072444.8827-3-francesco@dolcini.it
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Parth Pancholi
2024-10-29 08:24:44 +01:00
committed by Greg Kroah-Hartman
parent d9649a7e4d
commit c74c2cc7b7
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/host/xhci-pci.c
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@@ -646,6 +646,9 @@ int xhci_pci_common_probe(struct pci_dev *dev, const struct pci_device_id *id)
dma_set_max_seg_size(&dev->dev, UINT_MAX);
if (device_property_read_bool(&dev->dev, "ti,pwron-active-high"))
pci_clear_and_set_config_dword(dev, 0xE0, 0, 1 << 22);
return 0;
put_usb3_hcd: