linux-kernel - Re: [PATCH v2] serial: of-serial: Remove device

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Date:	Thu, 16 Apr 2015 11:31:10 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Michal Simek <michal.simek@...inx.com>
Cc:	linux-kernel@...r.kernel.org, monstr@...str.eu,
	stable@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-serial@...r.kernel.org, Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH v2] serial: of-serial: Remove device_type = "serial" registration

On Tuesday 14 April 2015 12:03:09 Michal Simek wrote:
> Do not probe all serial drivers by of_serial.c which are using
> device_type = "serial"; property. Only drivers which have valid
> compatible strings listed in the driver should be probed.
> 
> When PORT_UNKNOWN is setup probe will fail anyway.
> 
> Arnd quotation about driver historical background:
> "when I wrote that driver initially, the idea was that it would
> get used as a stub to hook up all other serial drivers but after
> that, the common code learned to create platform devices from DT"
> 
> This patch fix the problem with on the system with xilinx_uartps and
> 16550a where of_serial failed to register for xilinx_uartps and because
> of irq_dispose_mapping() removed irq_desc. Then when xilinx_uartps was asking
> for irq with request_irq() EINVAL is returned.
> 
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> CC: <stable@...r.kernel.org>
> ---
> 

Acked-by: Arnd Bergmann <arnd@...db.de>
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