From: Yuan Yao <yao.yuan@xxxxxxx>
Numbering the ttyLPn space should not depend on the generic name
"serial<n>".
If don't add the alias node like:"serial0 = &lpuart0;", then lpuart
will probe failed:
[ 0.773410] fsl-lpuart 2950000.serial: failed to get alias id, errno -19
So remove the alias node dependence, and add the support for allocate the
line port automatically.
Signed-off-by: Yuan Yao <yao.yuan@xxxxxxx>
---
drivers/tty/serial/fsl_lpuart.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index a1c6519..c6d639f 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -231,6 +231,8 @@
#define DEV_NAME "ttyLP"
#define UART_NR 6
+static DECLARE_BITMAP(linemap, UART_NR);
+
struct lpuart_port {
struct uart_port port;
struct clk *clk;
@@ -1963,9 +1965,13 @@ static int lpuart_probe(struct platform_device *pdev)
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;
+ ret = find_first_zero_bit(linemap, UART_NR);
+ if (ret >= UART_NR) {
+ dev_err(&pdev->dev, "port line is full, add device failed\n");
+ return ret;
+ }
}
+ set_bit(ret, linemap);
sport->port.line = ret;
sport->lpuart32 = of_device_is_compatible(np, "fsl,ls1021a-lpuart");
@@ -2047,6 +2053,7 @@ static int lpuart_remove(struct platform_device *pdev)
struct lpuart_port *sport = platform_get_drvdata(pdev);
uart_remove_one_port(&lpuart_reg, &sport->port);
+ clear_bit(sport->port.line, linemap);
clk_disable_unprepare(sport->clk);
--
2.1.0.27.g96db324
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