linux-kernel - Re: [PATCH] rtc: nintendo: Add a RTC driver for the GameCube, Wii and Wii U

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Date:   Thu, 28 Oct 2021 23:34:13 +0200
From:   Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
To:     Jonathan Neuschäfer <j.ne@...teo.net>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        rw-r-r-0644 <r.r.qwertyuiop.r.r@...il.com>,
        Ash Logan <ash@...quark.com>, linux-kernel@...r.kernel.org,
        linux-rtc@...r.kernel.org
Subject: Re: [PATCH] rtc: nintendo: Add a RTC driver for the GameCube, Wii
 and Wii U

On Thu, Oct 28, 2021 at 08:32:00PM +0000, Jonathan Neuschäfer wrote:
> Hi,
> 
> On Wed, Oct 27, 2021 at 06:45:54PM +0200, Alexandre Belloni wrote:
> > Hello Emmanuel,
> > 
> > Thanks for the patch!
> > 
> > On 15/10/2021 00:05:24+0200, Emmanuel Gil Peyrot wrote:
> [...]
> > Something great to do would be to convert the driver to regmap, provding
> > custom regmap_read and regmap_write functions to access the EXI bus.
> > Then you'd get this directly in debugfs. And this could be split ou once
> > other drivers need access to the bus (I guess power/reset at some
> > point).
> 
> Ultimately, a proper bus driver might be even better. Another popular
> (but 3rd-party) device on the EXI bus is the "USB Gecko", a serial port
> adapter.

The gc-linux project had such a bus driver, and I think also an
USB Gecko driver, but from what I remember they got rejected in the
kernel.  I’d have to do some archeology to figure out why though.

Still, maybe it would be sensible to port their 2.6.32-era driver?

I have one such USB Gecko btw, so I should be able to test against it.

> 
> (But I realize it might be significantly more work. Not sure.)
> 
> 
> 
> Best regards, and in any case still thanks for working on the GC/Wii/U
> platforms,
> Jonathan

-- 
Emmanuel Gil Peyrot

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