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serial: fsl_lpuart: Remove the alias node dependence

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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@nxp.com>
Signed-off-by: Vabhav Sharma <vabhav.sharma@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vabhav Sharma 2018-10-10 03:56:16 +05:30 committed by Greg Kroah-Hartman
parent 4e1a606d55
commit 3bc3206e1c
1 changed files with 10 additions and 2 deletions
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12
drivers/tty/serial/fsl_lpuart.c
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@ -232,6 +232,8 @@
/* IMX lpuart has four extra unused regs located at the beginning */
#define IMX_REG_OFF 0x10
static DEFINE_IDA(fsl_lpuart_ida);
struct lpuart_port {
struct uart_port port;
struct clk *clk;
@ -2143,8 +2145,11 @@ 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 = ida_simple_get(&fsl_lpuart_ida, 0, UART_NR, GFP_KERNEL);
if (ret < 0) {
dev_err(&pdev->dev, "port line is full, add device failed\n");
return ret;
}
}
if (ret >= ARRAY_SIZE(lpuart_ports)) {
dev_err(&pdev->dev, "serial%d out of range\n", ret);
@ -2246,6 +2251,8 @@ static int lpuart_remove(struct platform_device *pdev)
uart_remove_one_port(&lpuart_reg, &sport->port);
ida_simple_remove(&fsl_lpuart_ida, sport->port.line);
clk_disable_unprepare(sport->clk);
if (sport->dma_tx_chan)
@ -2384,6 +2391,7 @@ static int __init lpuart_serial_init(void)
static void __exit lpuart_serial_exit(void)
{
ida_destroy(&fsl_lpuart_ida);
platform_driver_unregister(&lpuart_driver);
uart_unregister_driver(&lpuart_reg);
}