linux-kernel - Re: [PATCH v15 06/16] of/fdt: add helper functions for handling properties

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Date:   Wed, 10 Oct 2018 11:30:16 +1100
From:   David Gibson <david@...son.dropbear.id.au>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     "AKASHI, Takahiro" <takahiro.akashi@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        David Howells <dhowells@...hat.com>,
        Vivek Goyal <vgoyal@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        David Miller <davem@...emloft.net>, dyoung@...hat.com,
        Baoquan He <bhe@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        prudo@...ux.ibm.com, Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        James Morse <james.morse@....com>, bhsharma@...hat.com,
        kexec@...ts.infradead.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v15 06/16] of/fdt: add helper functions for handling
 properties

On Tue, Oct 09, 2018 at 11:02:29AM -0700, Frank Rowand wrote:
> On 10/04/18 22:06, AKASHI, Takahiro wrote:
[snip]
> >>>> +int fdt_setprop_reg(void *fdt, int nodeoffset, const char *name,
> >>>> +                                               u64 addr, u64 size)
> >>>> +{
> >>>> +       int addr_cells, size_cells;
> >>
> >> unsigned
> > 
> > fdt_[address|size]_cell() returns an int.
> 
> I stand corrected.  They take advantage of the fact that valid values
> are in the range 0..4 and return a negative value for error.

I'm not sure if the spec formally defines that these values will fit
in a positive 'int'.  But if addresses are 8GiB each, you're going to
have much bigger problems putting it in a device tree than this
function.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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