linux-kernel - [PATCH v5 2/2] USB: xhci: add support for PWRON active high

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Message-Id: <20241029072444.8827-3-francesco@dolcini.it>
Date: Tue, 29 Oct 2024 08:24:44 +0100
From: Francesco Dolcini <francesco@...cini.it>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Francesco Dolcini <francesco.dolcini@...adex.com>
Cc: Parth Pancholi <parth.pancholi@...adex.com>,
	linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v5 2/2] USB: xhci: add support for PWRON active high

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

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@...adex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
---
v5:s/ti,tusb7320-pwron-active-high/ti,pwron-active-high/
v4: no changes
v3: no changes
v2: s/polarity-invert/active-high
---
 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..39456ec268f5 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,pwron-active-high"))
+		pci_clear_and_set_config_dword(dev, 0xE0, 0, 1 << 22);
+
 	return 0;
 
 put_usb3_hcd:
-- 
2.39.5