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Date:   Fri, 20 Nov 2020 14:43:03 -0500
From:   Al Cooper <>
Cc:     Jim Quinlan <>,
        Al Cooper <>,,,
        Greg Kroah-Hartman <>,
        Jiri Slaby <>,,,
        Masahiro Yamada <>,
        Rob Herring <>
Subject: [PATCH 1/3] serial: 8250: of: Check for CONFIG_SERIAL_8250_BCM7271

From: Jim Quinlan <>

This commit has of_platform_serial_probe() check specifically for the
"brcm,bcm7271-uart" and whether its companion driver is enabled. If it
is the case, and the clock provider is not ready, we want to make sure
that when the 8250_bcm7271.c driver returns EPROBE_DEFER, we are not
getting the UART registered via 8250_of.c.

Signed-off-by: Jim Quinlan <>
 drivers/tty/serial/8250/8250_of.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
index 65e9045dafe6..aa458f3c6644 100644
--- a/drivers/tty/serial/8250/8250_of.c
+++ b/drivers/tty/serial/8250/8250_of.c
@@ -192,6 +192,10 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
 	u32 tx_threshold;
 	int ret;
+	    of_device_is_compatible(ofdev->dev.of_node, "brcm,bcm7271-uart"))
+		return -ENODEV;
 	port_type = (unsigned long)of_device_get_match_data(&ofdev->dev);
 	if (port_type == PORT_UNKNOWN)
 		return -EINVAL;

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