serial: pxa: add OF support

Parse uart device id from alias in DTS file.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>

1 files changed, 37 insertions, 12 deletions

diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
index 5c8e3bba6c84..cdf4b2bfad80 100644
--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -36,6 +36,7 @@
 #include <linux/circ_buf.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
@@ -44,6 +45,8 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 
+#define PXA_NAME_LEN            8
+
 struct uart_pxa_port {
         struct uart_port        port;
         unsigned char           ier;
@@ -51,7 +54,7 @@ struct uart_pxa_port {
         unsigned char           mcr;
         unsigned int            lsr_break_flag;
         struct clk              *clk;
-        char                    *name;
+        char                    name[PXA_NAME_LEN];
 };
 
 static inline unsigned int serial_in(struct uart_pxa_port *up, int offset)
@@ -781,6 +784,31 @@ static const struct dev_pm_ops serial_pxa_pm_ops = {
 };
 #endif
 
+static struct of_device_id serial_pxa_dt_ids[] = {
+        { .compatible = "mrvl,pxa-uart", },
+        { .compatible = "mrvl,mmp-uart", },
+        {}
+};
+MODULE_DEVICE_TABLE(of, serial_pxa_dt_ids);
+
+static int serial_pxa_probe_dt(struct platform_device *pdev,
+                               struct uart_pxa_port *sport)
+{
+        struct device_node *np = pdev->dev.of_node;
+        int ret;
+
+        if (!np)
+                return 1;
+
+        ret = of_alias_get_id(np, "serial");
+        if (ret < 0) {
+                dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
+                return ret;
+        }
+        sport->port.line = ret;
+        return 0;
+}
+
 static int serial_pxa_probe(struct platform_device *dev)
 {
         struct uart_pxa_port *sport;
@@ -808,20 +836,16 @@ static int serial_pxa_probe(struct platform_device *dev)
         sport->port.irq = irqres->start;
         sport->port.fifosize = 64;
         sport->port.ops = &serial_pxa_pops;
-        sport->port.line = dev->id;
         sport->port.dev = &dev->dev;
         sport->port.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
         sport->port.uartclk = clk_get_rate(sport->clk);
 
-        switch (dev->id) {
-        case 0: sport->name = "FFUART"; break;
-        case 1: sport->name = "BTUART"; break;
-        case 2: sport->name = "STUART"; break;
-        case 3: sport->name = "HWUART"; break;
-        default:
-                sport->name = "???";
-                break;
-        }
+        ret = serial_pxa_probe_dt(dev, sport);
+        if (ret > 0)
+                sport->port.line = dev->id;
+        else if (ret < 0)
+                goto err_clk;
+        snprintf(sport->name, PXA_NAME_LEN - 1, "UART%d", sport->port.line + 1);
 
         sport->port.membase = ioremap(mmres->start, resource_size(mmres));
         if (!sport->port.membase) {
@@ -829,7 +853,7 @@ static int serial_pxa_probe(struct platform_device *dev)
                 goto err_clk;
         }
 
-        serial_pxa_ports[dev->id] = sport;
+        serial_pxa_ports[sport->port.line] = sport;
 
         uart_add_one_port(&serial_pxa_reg, &sport->port);
         platform_set_drvdata(dev, sport);
@@ -866,6 +890,7 @@ static struct platform_driver serial_pxa_driver = {
 #ifdef CONFIG_PM
                 .pm     = &serial_pxa_pm_ops,
 #endif
+                .of_match_table = serial_pxa_dt_ids,
         },
 };