[PATCH v8 2/3] serial: port: Add support of PNP IRQ to __uart_read_properties()

[Guanbing Huang]

From: Guanbing Huang <albanhuang@xxxxxxxxxxx>

The function __uart_read_properties doesn't cover PNP devices, so add IRQ
processing for PNP devices in the branch.

Signed-off-by: Guanbing Huang <albanhuang@xxxxxxxxxxx>
Suggested-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Reviewed-by: Bing Fan <tombinfan@xxxxxxxxxxx>
Tested-by: Linheng Du <dylanlhdu@xxxxxxxxxxx>
---
v6 -> v7: add a "Reviewed-by" tag
v5 -> v6: fix the issue that the cover letter is not chained with the patch series
v4 -> v5: change "pnp" and "irq" in the commit message to uppercase, modify the subject
          to start with "serial: port:", modify the location of the header file pnp.h 

 drivers/tty/serial/serial_port.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/serial_port.c b/drivers/tty/serial/serial_port.c
index 22b9eeb23e68..8504bae1d2c9 100644
--- a/drivers/tty/serial/serial_port.c
+++ b/drivers/tty/serial/serial_port.c
@@ -11,6 +11,7 @@
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/pnp.h>
 #include <linux/property.h>
 #include <linux/serial_core.h>
 #include <linux/spinlock.h>
@@ -221,7 +222,11 @@ static int __uart_read_properties(struct uart_port *port, bool use_defaults)
 
 	if (dev_is_platform(dev))
 		ret = platform_get_irq(to_platform_device(dev), 0);
-	else
+	else if (dev_is_pnp(dev)) {
+		ret = pnp_irq(to_pnp_dev(dev), 0);
+		if (ret < 0)
+			ret = -ENXIO;
+	} else
 		ret = fwnode_irq_get(dev_fwnode(dev), 0);
 	if (ret == -EPROBE_DEFER)
 		return ret;
-- 
2.17.1