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Subject: Linux-3.14-rc2: Order of serial node compatibles in DTS files.
From: Stephen N Chivers <schivers@csc.com.au>
Message-ID: <OF6F6A0029.3B20EF5B-ONCA257C7C.0071BFDA-CA257C7C.00732AD3@csc.com>
Date: Wed, 12 Feb 2014 06:57:56 +1000
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Cc: Chris Proctor <cproctor@csc.com.au>
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I have been trial booting a 3.14-rc2 kernel for a 85xx platform 
(dtbImage).

After mounting the root filesystem there are no messages from the init 
scripts
and the serial console is not available for login.

In the kernel log messages there is:

of_serial f1004500.serial: Unknown serial port found, ignored.

The serial nodes in boards dts file are specified as:

        serial0: serial@4500 {
                        cell-index = <0>;
                        device_type = "serial";
                        compatible = "fsl,ns16550", "ns16550";
                        reg = <0x4500 0x100>;
                        clock-frequency = <0>;
                        interrupts = <0x2a 0x2>;
                        interrupt-parent = <&mpic>;
                };

Reversing the order of the compatible:

        compatible = "ns16550", "fsl,ns16550";

restores the serial console.

Linux-3.13 does not have this behaviour.

There are 49 dts files in Linux-3.14-rc2 that have the fsl,ns16550 
compatible first.

Stephen Chivers,
CSC Australia Pty. Ltd.