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serial: 8250: bcm2835aux - defer if clock is zero

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See: https://github.com/raspberrypi/linux/issues/3700

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
This commit is contained in:
Phil Elwell
2020-07-02 13:53:20 +01:00
committed by popcornmix
parent ed6e6df451
commit ee21249850
1 changed files with 7 additions and 0 deletions
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7
drivers/tty/serial/8250/8250_bcm2835aux.c
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@@ -148,6 +148,13 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
*/
up.port.uartclk = clk_get_rate(data->clk) * 2;
/* The clock is only queried at probe time, which means we get one shot
* at this. A zero clock is never going to work and is almost certainly
* due to a parent not being ready, so prefer to defer.
*/
if (!up.port.uartclk)
return -EPROBE_DEFER;
/* register the port */
ret = serial8250_register_8250_port(&up);
if (ret < 0) {