lkml.org 
[lkml]   [2019]   [Jan]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] tty: serial: meson: if no alias specified use an available id
Date
At probe, the uart driver tries to get an id from a device tree alias.
When no alias was specified, the driver would return an error and probing
would fail.

Providing an alias for registering a serial device should not be mandatory.
If the device tree does not specify an alias, provide an id from a reserved
range so that the probing can continue.

Signed-off-by: Loys Ollivier <lollivier@baylibre.com>
---
drivers/tty/serial/meson_uart.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
index 8a842591b37c..fbc5bc022a39 100644
--- a/drivers/tty/serial/meson_uart.c
+++ b/drivers/tty/serial/meson_uart.c
@@ -72,7 +72,8 @@
#define AML_UART_BAUD_USE BIT(23)
#define AML_UART_BAUD_XTAL BIT(24)

-#define AML_UART_PORT_NUM 6
+#define AML_UART_PORT_NUM 12
+#define AML_UART_PORT_OFFSET 6
#define AML_UART_DEV_NAME "ttyAML"


@@ -654,10 +655,20 @@ static int meson_uart_probe(struct platform_device *pdev)
struct resource *res_mem, *res_irq;
struct uart_port *port;
int ret = 0;
+ int id = -1;

if (pdev->dev.of_node)
pdev->id = of_alias_get_id(pdev->dev.of_node, "serial");

+ if (pdev->id < 0) {
+ for (id = AML_UART_PORT_OFFSET; id < AML_UART_PORT_NUM; id++) {
+ if (!meson_ports[id]) {
+ pdev->id = id;
+ break;
+ }
+ }
+ }
+
if (pdev->id < 0 || pdev->id >= AML_UART_PORT_NUM)
return -EINVAL;

--
2.7.4
\
 
 \ /
  Last update: 2019-01-14 17:54    [W:0.039 / U:10.064 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site