linux-kernel - [PATCH v1 2/2] USB: xhci: add support for PWRON polarity invert

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Message-Id: <20241004124521.53442-3-francesco@dolcini.it>
Date: Fri,  4 Oct 2024 14:45:21 +0200
From: Francesco Dolcini <francesco@...cini.it>
To: Mathias Nyman <mathias.nyman@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Parth Pancholi <parth.pancholi@...adex.com>,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Francesco Dolcini <francesco.dolcini@...adex.com>
Subject: [PATCH v1 2/2] USB: xhci: add support for PWRON polarity invert

From: Parth Pancholi <parth.pancholi@...adex.com>

Some PCIe-to-USB controllers such as TI's TUSB73x0 3.0 xHCI host
the controller supports controlling the PWRONx polarity via the USB
control register (E0h). Add support for device tree property
ti,tusb7320-pwron-polarity-invert 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 which could be used as USB EN
signals for the other hubs or devices.

Signed-off-by: Parth Pancholi <parth.pancholi@...adex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
---
 drivers/usb/host/xhci-pci.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 91dccd25a551..440fbaeeaa3d 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -641,6 +641,9 @@ 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,tusb7320-pwron-polarity-invert"))
+		pci_clear_and_set_config_dword(dev, 0xE0, 0, 1 << 22);
+
 	return 0;
 
 put_usb3_hcd:
-- 
2.39.5