linux-kernel - Re: [PATCH v4 5/5] ARM: ep93xx: ts72xx: Add support for BK3 board

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Date:   Mon, 11 Dec 2017 22:39:41 +0100
From:   Lukasz Majewski <lukma@...x.de>
To:     Hartley Sweeten <HartleyS@...ionengravers.com>
Cc:     Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        "arndbergmann@...il.com" <arndbergmann@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Olof Johansson <olof@...om.net>,
        "Linus Walleij" <linus.walleij@...aro.org>
Subject: Re: [PATCH v4 5/5] ARM: ep93xx: ts72xx: Add support for BK3 board -
 ts72xx derivative

Hi Hartley,

> On Thursday, November 30, 2017 4:52 PM, Lukasz Majewski wrote:
> >
> > The BK3 board is a derivative of the ts72xx reference design.  
> 
> Lukasz,
> 
> I was just reviewing the other TS-72xx boards and noticed this:
> 
> <snip>
> 
> > +/* BK3 specific defines */
> > +#define BK3_CPLDVER_PHYS_BASE		0x23400000
> > +#define BK3_CPLDVER_VIRT_BASE		0xfebfd000
> > +#define BK3_CPLDVER_SIZE		0x00001000
> > +  
> 
> <snip>
> 
> > +static struct map_desc bk3_io_desc[] __initdata = {
> > +	{
> > +		.virtual	= BK3_CPLDVER_VIRT_BASE,
> > +		.pfn		=
> > __phys_to_pfn(BK3_CPLDVER_PHYS_BASE),
> > +		.length	= BK3_CPLDVER_SIZE,
> > +		.type		= MT_DEVICE,
> > +	}
> > +};
> > +  
> 
> This register appears to be common to all the TS-72xx boards.

The CPLD was used on the reference ts-72xx boards, but support for it
seems to not be present in the mainline kernel.

Do you have a ts72xx board with CPLD embedded? Is any of your design
using it?


My another concern - is it safe to perform IO mapping on memory regions
which are not used / specified? When I do a single ts72xx mapping - for
all boards - then we may end up with some mappings which are not needed.

With the code as it is - I only map regions which are already used on
relevant boards.

> 
> I don't think Arnd has pulled the series yet. Would you mind renaming
> the defines and rebasing this patch? 

If needed I can resend the patch series, or prepare a single fix patch.
No problem.

> The BK3 board and other TS-72xx
> boards can then have a common .map_io.
> 
> Thanks,
> Hartley
> 



Best regards,

Lukasz Majewski

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