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tty: serial: meson: if no alias specified use an available id

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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.

Suggested-by: Rob Herring <robh@kernel.org>
Signed-off-by: Loys Ollivier <lollivier@baylibre.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Loys Ollivier 2019-01-14 17:54:26 +01:00 committed by Greg Kroah-Hartman
parent 896efccfcc
commit a26988e8fe
1 changed files with 12 additions and 1 deletions
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13
drivers/tty/serial/meson_uart.c
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@ -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;