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Re: [PATCH -queue v0 5/6] [loongson] rtc: enable legacy RTC driver on fu

To: Arnaud Patard <>
Subject: Re: [PATCH -queue v0 5/6] [loongson] rtc: enable legacy RTC driver on fuloong2f
From: Wu Zhangjin <>
Date: Wed, 04 Nov 2009 19:18:47 +0800
Cc: Ralf Baechle <>,, LKML <>,,, Zhang Le <>, Thomas Gleixner <>, Nicholas Mc Guire <>,,
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Organization: DSLab, Lanzhou University, China
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On Wed, 2009-11-04 at 11:40 +0100, Arnaud Patard wrote:
> Wu Zhangjin <> writes:
> Hi,
> > RTC_LIB is selected by MIPS by default, and therefore, the legacy RTC 
> > driver is
> > disabled. but unfortunately, RTC_LIB not works on fulong, so, enabling the 
> > legcy
> > RTC driver is needed, otherwise, the tools like hwclock will not work.
> >
> > because loongson family machines, including fuloong2e, fuloong2f and
> > yeeloong2f need to enable legacy RTC driver, so we use MACH_LOONGSON
> > here.
> There are loongson machines which are working fine with RTC_LIB (for
> instance the gdium which is using a m41t83 on i2c) so would be better to
> be more restrictive imho.

In reality, fuloong2e, fuloong2f and yeeloong2f work fine with RTC_LIB,
but relative patches need to append to drivers/rtc/rtc-cmos.c and also
need a RTC platform device. If what I remembered is right, Gdium also
need corresponding patches to make it work with RTC_LIB.

Herein, I just let the basic support for those machines work, and then,
the RTC_LIB support will be sent out later.

and a small question: if legacy RTC driver works well on these machines,
why should we forbid people to use it? I think it's better to remove the
"select RTC_LIB" line for MIPS, and then, the people will be free to
choose what they want, and even for the users whose platform not support

        Wu Zhangjin

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