linux-kernel - [PATCH 1/3] serial: 8250: of: Check for CONFIG_SERIAL_8250

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Date:   Fri, 20 Nov 2020 14:43:03 -0500
From:   Al Cooper <alcooperx@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jim Quinlan <jquinlan@...adcom.com>,
        Al Cooper <alcooperx@...il.com>,
        bcm-kernel-feedback-list@...adcom.com, devicetree@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-serial@...r.kernel.org, linux-usb@...r.kernel.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: [PATCH 1/3] serial: 8250: of: Check for CONFIG_SERIAL_8250_BCM7271

From: Jim Quinlan <jquinlan@...adcom.com>

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 <jquinlan@...adcom.com>
---
 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;
 
+	if (IS_ENABLED(CONFIG_SERIAL_8250_BCM7271) &&
+	    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;
-- 
2.17.1