usb: usb251xb: Create a ports field collector method

Seeing the ports field collection functionality is used four times per
just one function, it's better to have a dedicated method performing
the task. Note that this fix filters the port 0 out from the lanes
swapping property the same way as it has been programmed for the rest
multi-ports properties. But unlike the rest of ports config registers
the BIT(0) of the Port Lanes Swap register refers to the Upstream Port
lanes inversion. This fact hasn't been documented in the driver bindings
nor there were any mentioning about port 0 being treated as upstream
port. Lets then leave this fix as is for the properties unification
and create an additional "swap-us-lanes" in the next patch.

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
Acked-by: Richard Leitner <richard.leitner@skidata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/misc/usb251xb.c

@@ -374,18 +374,31 @@ static int usb251xb_connect(struct usb251xb *hub)
 }
 
 #ifdef CONFIG_OF
+static void usb251xb_get_ports_field(struct usb251xb *hub,
+				    const char *prop_name, u8 port_cnt, u8 *fld)
+{
+	struct device *dev = hub->dev;
+	struct property *prop;
+	const __be32 *p;
+	u32 port;
+
+	of_property_for_each_u32(dev->of_node, prop_name, prop, p, port) {
+		if ((port >= 1) && (port <= port_cnt))
+			*fld |= BIT(port);
+		else
+			dev_warn(dev, "port %u doesn't exist\n", port);
+	}
+}
+
 static int usb251xb_get_ofdata(struct usb251xb *hub,
 			       struct usb251xb_data *data)
 {
 	struct device *dev = hub->dev;
 	struct device_node *np = dev->of_node;
-	int len, err, i;
-	u32 port, property_u32 = 0;
-	const u32 *cproperty_u32;
+	int len, err;
+	u32 property_u32 = 0;
 	const char *cproperty_char;
 	char str[USB251XB_STRING_BUFSIZE / 2];
-	struct property *prop;
-	const __be32 *p;
 
 	if (!np) {
 		dev_err(dev, "failed to get ofdata\n");
@@ -487,46 +500,16 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
 		hub->conf_data3 |= BIT(0);
 
 	hub->non_rem_dev = USB251XB_DEF_NON_REMOVABLE_DEVICES;
-	cproperty_u32 = of_get_property(np, "non-removable-ports", &len);
-	if (cproperty_u32 && (len / sizeof(u32)) > 0) {
-		for (i = 0; i < len / sizeof(u32); i++) {
-			u32 port = be32_to_cpu(cproperty_u32[i]);
-
-			if ((port >= 1) && (port <= data->port_cnt))
-				hub->non_rem_dev |= BIT(port);
-			else
-				dev_warn(dev, "NRD port %u doesn't exist\n",
-					port);
-		}
-	}
+	usb251xb_get_ports_field(hub, "non-removable-ports", data->port_cnt,
+				 &hub->non_rem_dev);
 
 	hub->port_disable_sp = USB251XB_DEF_PORT_DISABLE_SELF;
-	cproperty_u32 = of_get_property(np, "sp-disabled-ports", &len);
-	if (cproperty_u32 && (len / sizeof(u32)) > 0) {
-		for (i = 0; i < len / sizeof(u32); i++) {
-			u32 port = be32_to_cpu(cproperty_u32[i]);
-
-			if ((port >= 1) && (port <= data->port_cnt))
-				hub->port_disable_sp |= BIT(port);
-			else
-				dev_warn(dev, "PDS port %u doesn't exist\n",
-					port);
-		}
-	}
+	usb251xb_get_ports_field(hub, "sp-disabled-ports", data->port_cnt,
+				 &hub->port_disable_sp);
 
 	hub->port_disable_bp = USB251XB_DEF_PORT_DISABLE_BUS;
-	cproperty_u32 = of_get_property(np, "bp-disabled-ports", &len);
-	if (cproperty_u32 && (len / sizeof(u32)) > 0) {
-		for (i = 0; i < len / sizeof(u32); i++) {
-			u32 port = be32_to_cpu(cproperty_u32[i]);
-
-			if ((port >= 1) && (port <= data->port_cnt))
-				hub->port_disable_bp |= BIT(port);
-			else
-				dev_warn(dev, "PDB port %u doesn't exist\n",
-					port);
-		}
-	}
+	usb251xb_get_ports_field(hub, "bp-disabled-ports", data->port_cnt,
+				 &hub->port_disable_bp);
 
 	hub->max_power_sp = USB251XB_DEF_MAX_POWER_SELF;
 	if (!of_property_read_u32(np, "sp-max-total-current-microamp",
@@ -589,10 +572,8 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
 	 * register controls the USB DP/DM signal swapping for each port.
 	 */
 	hub->port_swap = USB251XB_DEF_PORT_SWAP;
-	of_property_for_each_u32(np, "swap-dx-lanes", prop, p, port) {
-		if (port <= data->port_cnt)
-			hub->port_swap |= BIT(port);
-	}
+	usb251xb_get_ports_field(hub, "swap-dx-lanes", data->port_cnt,
+				 &hub->port_swap);
 
 	/* The following parameters are currently not exposed to devicetree, but
 	 * may be as soon as needed.