serial: 8250_dw: add dw8250_quirks function

Merging the DT and ACPI specific probe functions into
dw8250_quirks. Those functions did not have that much code
any more and some of the quirks need to be shared. This
will also allow platforms without DT or ACPI to use the
driver.
Signed-off-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_dw.c

@@ -283,12 +283,26 @@ static void dw8250_setup_port(struct uart_8250_port *up)
 		up->capabilities |= UART_CAP_AFE;
 }
 
-static int dw8250_probe_of(struct uart_port *p,
-			   struct dw8250_data *data)
+static bool dw8250_idma_filter(struct dma_chan *chan, void *param)
+{
+	struct device *dev = param;
+
+	if (dev != chan->device->dev->parent)
+		return false;
+
+	return true;
+}
+
+static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data)
 {
+	if (p->dev->of_node) {
 		struct device_node *np = p->dev->of_node;
 		int id;
 
+		/* get index of serial line, if found in DT aliases */
+		id = of_alias_get_id(np, "serial");
+		if (id >= 0)
+			p->line = id;
 #ifdef CONFIG_64BIT
 		if (of_device_is_compatible(np, "cavium,octeon-3860-uart")) {
 			p->serial_in = dw8250_serial_inq;
@@ -299,45 +313,22 @@ static int dw8250_probe_of(struct uart_port *p,
 			data->skip_autocfg = true;
 		}
 #endif
-	/* get index of serial line, if found in DT aliases */
-	id = of_alias_get_id(np, "serial");
-	if (id >= 0)
-		p->line = id;
-
-	return 0;
-}
-
-static bool dw8250_idma_filter(struct dma_chan *chan, void *param)
-{
-	struct device *dev = param;
-
-	if (dev != chan->device->dev->parent)
-		return false;
-
-	return true;
-}
-
-static int dw8250_probe_acpi(struct uart_8250_port *up,
-			     struct dw8250_data *data)
-{
-	struct uart_port *p = &up->port;
-
+	} else if (has_acpi_companion(p->dev)) {
 		p->iotype = UPIO_MEM32;
+		p->regshift = 2;
 		p->serial_in = dw8250_serial_in32;
 		p->serial_out = dw8250_serial_out32;
-	p->regshift = 2;
+		p->set_termios = dw8250_set_termios;
+	}
 
 	/* Platforms with iDMA */
-	if (platform_get_resource_byname(to_platform_device(up->port.dev),
+	if (platform_get_resource_byname(to_platform_device(p->dev),
 					 IORESOURCE_MEM, "lpss_priv")) {
-		data->dma.rx_param = up->port.dev->parent;
-		data->dma.tx_param = up->port.dev->parent;
+		p->set_termios = dw8250_set_termios;
+		data->dma.rx_param = p->dev->parent;
+		data->dma.tx_param = p->dev->parent;
 		data->dma.fn = dw8250_idma_filter;
 	}
-
-	up->port.set_termios = dw8250_set_termios;
-
-	return 0;
 }
 
 static int dw8250_probe(struct platform_device *pdev)
@@ -468,18 +459,7 @@ static int dw8250_probe(struct platform_device *pdev)
 	data->dma.tx_param = data;
 	data->dma.fn = dw8250_dma_filter;
 
-	if (pdev->dev.of_node) {
-		err = dw8250_probe_of(p, data);
-		if (err)
-			goto err_reset;
-	} else if (ACPI_HANDLE(&pdev->dev)) {
-		err = dw8250_probe_acpi(&uart, data);
-		if (err)
-			goto err_reset;
-	} else {
-		err = -ENODEV;
-		goto err_reset;
-	}
+	dw8250_quirks(p, data);
 
 	if (!data->skip_autocfg)
 		dw8250_setup_port(&uart);