linux-kernel - Specifying console via "stdout-path" property

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Message-ID: <1503425451.2586.56.camel@synopsys.com>
Date:   Tue, 22 Aug 2017 18:10:52 +0000
From:   Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
To:     "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Specifying console via "stdout-path" property

Hi everyone,

I got strange results when I tried to specify device to use as console
via "stdout-path" property in device tree:
Even If I specify device in "stdout-path" property first probed device
(of those that can be used as console device) is used as console.

For example:
-------------->8--------
chosen {
    stdout-path = &serial1;
};

serial0: uart0@... {} /* serial0 is used as console (ttyS0) as it is
                       * probed earlier */
serial1: uart1@... {}
-------------->8--------

So I am wondering is it expected behavior?


Everything is fine if I specify uart device via "console" parameter in
bootargs:
-------------->8--------
chosen {
    bootargs = "console=ttyS1"
    stdout-path = &serial1;
};

serial0: uart0@... {}
serial1: uart1@... {} /* serial1 is used as console (ttyS1) */
-------------->8--------

Thanks.
-- 
 Eugeniy Paltsev