linux-kernel - [PATCH 3/3] usb: usb251xb: Add US port lanes inversion property

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Message-Id: <20190424211208.17499-4-fancer.lancer@gmail.com>
Date:   Thu, 25 Apr 2019 00:12:07 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Richard Leitner <richard.leitner@...data.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Serge Semin <Sergey.Semin@...latforms.ru>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] usb: usb251xb: Add US port lanes inversion property

The driver bindings already declare the "swap-dx-lanes" property to
invert the downstream ports lanes polarity. The similar config
can be defined for a single upstream port - "swap-us-lanes". It's
going to be boolean since there is only one upstream port
on the hub.

Signed-off-by: Serge Semin <fancer.lancer@...il.com>
---
 drivers/usb/misc/usb251xb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/misc/usb251xb.c b/drivers/usb/misc/usb251xb.c
index 4ef34df948ad..56f0a10633fc 100644
--- a/drivers/usb/misc/usb251xb.c
+++ b/drivers/usb/misc/usb251xb.c
@@ -531,6 +531,8 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
 	hub->port_swap = USB251XB_DEF_PORT_SWAP;
 	usb251xb_get_ports_field(hub, "swap-dx-lanes", data->port_cnt,
 				 &hub->port_swap);
+	if (of_get_property(np, "swap-us-lanes", NULL))
+		hub->port_swap |= BIT(0);
 
 	/* The following parameters are currently not exposed to devicetree, but
 	 * may be as soon as needed.
-- 
2.21.0