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- From 34fb077ceed5166f4426daf21287d2ff4c0d65ca Mon Sep 17 00:00:00 2001
- From: Phil Elwell <[email protected]>
- Date: Thu, 2 Jul 2020 13:53:20 +0100
- Subject: [PATCH] serial: 8250: bcm2835aux - defer if clock is zero
- See: https://github.com/raspberrypi/linux/issues/3700
- Signed-off-by: Phil Elwell <[email protected]>
- ---
- drivers/tty/serial/8250/8250_bcm2835aux.c | 7 +++++++
- 1 file changed, 7 insertions(+)
- --- a/drivers/tty/serial/8250/8250_bcm2835aux.c
- +++ b/drivers/tty/serial/8250/8250_bcm2835aux.c
- @@ -182,6 +182,13 @@ static int bcm2835aux_serial_probe(struc
- */
- up.port.uartclk = uartclk * 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) {
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