linux-kernel - Re: [PATCH] serial: rewrite pxa2xx-uart to use 8250

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Date:	Fri, 06 Dec 2013 14:34:17 +0400
From:	Sergei Ianovich <ynvich@...il.com>
To:	James Cameron <quozl@...top.org>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	"open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Crispin <blogic@...nwrt.org>, Jiri Slaby <jslaby@...e.cz>,
	"moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
	Zhou Zhu <zzhu3@...vell.com>
Subject: Re: [PATCH] serial: rewrite pxa2xx-uart to use 8250_core

On Fri, 2013-12-06 at 20:53 +1100, James Cameron wrote:
> I don't understand why /dev/ttyS2 (4,66) changed to /dev/ttyS0 (4,64)
> after the patch was applied to olpc-kernel/arm-3.5 but, as you say it
> doesn't change, perhaps there is something between 3.5 and now for me
> to watch out for.  My problem.

The old pxa.c set device ids explicitly:
-static int serial_pxa_probe_dt(struct platform_device *pdev,
-                              struct uart_pxa_port *sport)
-{
-       struct device_node *np = pdev->dev.of_node;
-       int ret;
-
-       if (!np)
-               return 1;
-
-       ret = of_alias_get_id(np, "serial");
-       if (ret < 0) {
-               dev_err(&pdev->dev, "failed to get alias id, errno %d
\n", ret);
-               return ret;
-       }
-       sport->port.line = ret;
-       return 0;
-}

and

-       ret = serial_pxa_probe_dt(dev, sport);
-       if (ret > 0)
-               sport->port.line = dev->id;


However, this is not possible with 8250_core. The latter assigns device
ids strictly in the call order of serial8250_register_8250_port().

Hope it helps.

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