linux-kernel - Re: [PATCH v2 3/6] ARM: at91: Add armv7m support

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Message-ID: <19094397.gRAFyF5emk@wuerfel>
Date:   Thu, 20 Oct 2016 15:23:19 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Nicolas Ferre <nicolas.ferre@...el.com>,
        linux-kernel@...r.kernel.org,
        Szemző András <sza@....hu>
Subject: Re: [PATCH v2 3/6] ARM: at91: Add armv7m support

On Thursday, October 20, 2016 12:26:21 PM CEST Alexandre Belloni wrote:
> 
> On 20/10/2016 at 11:52:20 +0200, Arnd Bergmann wrote :
> > On Thursday, October 20, 2016 11:41:32 AM CEST Alexandre Belloni wrote:
> > > +
> > > +static void __init samx7_dt_device_init(void)
> > > +{
> > > +       struct soc_device *soc;
> > > +       struct device *soc_dev = NULL;
> > > +
> > > +       soc = at91_soc_init(samx7_socs);
> > > +       if (soc)
> > > +               soc_dev = soc_device_to_device(soc);
> > > +
> > > +       of_platform_populate(NULL, of_default_bus_match_table, NULL, soc_dev);
> > > +}
> > 
> > This was initially the idea for the soc_device, but we've stopped
> > using it as the parent for the on-chip devices a while ago.
> > 
> > Just register the device for identification here, and use
> > of_platform_default_populate with a NULL parent as most others do.
> > 
> > We should also investigate whether we can convert the three other
> > at91 variants to do the same without breaking expectations in user space.
> > 
> 
> My opinion is that we could just remove the whole at91_soc_init stuff
> but I think Nicolas still wants the two info lines to be printed for
> debugging/support purposes. I'm not sure how much this is used anyway
> and I don't find the sysfs attributes to be particularly useful.
> 
> Also, removing soc.c is a 10% reduction of the code in mach-at91 
> 

Having the soc_device driver is very valuable in order to have
an interface to be used from user space (and soon from the kernel)
to look up the exact SoC type in a generic way, so I'd definitely
want to keep that, though we may want to move that driver to
drivers/soc/.

	Arnd