[RFC] serial: sc16is7xx: Use DT sub-nodes for UART ports

[Andreas Färber]

This is to allow using serdev.

Signed-off-by: Andreas Färber <afaer...@suse.de>
---
 drivers/tty/serial/sc16is7xx.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 243c96025053..ad7267274f65 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1213,9 +1213,31 @@ static int sc16is7xx_probe(struct device *dev,
                        SC16IS7XX_IOCONTROL_SRESET_BIT);
 
        for (i = 0; i < devtype->nr_uart; ++i) {
+#ifdef CONFIG_OF
+               struct device_node *np;
+               struct platform_device *pdev;
+               char name[6] = "uartx";
+#endif
+
                s->p[i].line            = i;
                /* Initialize port data */
+#ifdef CONFIG_OF
+               name[4] = '0' + i;
+               np = of_get_child_by_name(dev->of_node, name);
+               if (IS_ERR(np)) {
+                       ret = PTR_ERR(np);
+                       goto out_ports;
+               }
+               pdev = of_platform_device_create(np, NULL, dev);
+               if (IS_ERR(pdev)) {
+                       ret = PTR_ERR(pdev);
+                       goto out_ports;
+               }
+               platform_set_drvdata(pdev, dev_get_drvdata(dev));
+               s->p[i].port.dev        = &pdev->dev;
+#else
                s->p[i].port.dev        = dev;
+#endif
                s->p[i].port.irq        = irq;
                s->p[i].port.type       = PORT_SC16IS7XX;
                s->p[i].port.fifosize   = SC16IS7XX_FIFO_SIZE;
@@ -1271,6 +1293,9 @@ static int sc16is7xx_probe(struct device *dev,
        for (i--; i >= 0; i--) {
                uart_remove_one_port(&sc16is7xx_uart, &s->p[i].port);
                clear_bit(s->p[i].port.line, &sc16is7xx_lines);
+#ifdef CONFIG_OF
+               of_platform_device_destroy(s->p[i].port.dev, NULL);
+#endif
        }
 
 #ifdef CONFIG_GPIOLIB
-- 
2.16.4