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From: Arnd Bergmann <arnd@arndb.de>
To: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: Rob Herring <robh@kernel.org>, Russell King - ARM Linux <linux@arm.linux.org.uk>, Alexandre Belloni <alexandre.belloni@free-electrons.com>, Eric Miao <eric.y.miao@gmail.com>, Haojian Zhuang <haojian.zhuang@gmail.com>, Alessandro Zummo <a.zummo@towertech.it>, rtc-linux@googlegroups.com, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, Daniel Mack <daniel@zonque.org>
Subject: [rtc-linux] Re: [PATCH v3 1/4] ARM: pxa: add memory resource to RTC device
Date: Tue, 12 May 2015 22:30:12 +0200
Message-ID: <53644246.uSkhGz7C05@wuerfel>
In-Reply-To: <878uctmtm6.fsf@belgarion.home>
References: <1431384089-28367-1-git-send-email-robh@kernel.org> <87lhgumi4b.fsf@belgarion.home> <878uctmtm6.fsf@belgarion.home>
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On Tuesday 12 May 2015 22:24:49 Robert Jarzmik wrote:
> 
> I made the try, and Russell was right, this breaks the pxa architecture. The
> relevant extract of kernel message is in [1].
> 
> The consequences with your patches :
>  - pxa27x_init()
>    - platform_add_devices()
>      - the pxa_device_rtc fails (as resource is duplicated)
>      - all the devices are unregistered (rollback)
> And pxa27x fails.
> 
> Now I'm pondering about the right approach :
>  - either remove sa1100_device_rtc from pxas
>  - or remove pxa_device_rtc
>  - or both
>  - or something else
> 
> Let me think a bit about it.
> 

To solve the problem with the duplicate registration of one resource,
I'd suggest using platform_device_register_simple() for the registration,
which will copy the resource. You can then mark the resource as __initconst
and remove the device to save a little memory at runtime.

	Arnd

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