linux-kernel - Re: [PATCH v7 4/5] nvmem: eeprom: at25: export FRAM serial num

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Message-ID: <b1c0eab3-8d07-5c52-300e-45974f7fea9c@aksignal.cz>
Date:   Tue, 8 Jun 2021 11:45:56 +0200
From:   Jiří Prchal <jiri.prchal@...ignal.cz>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Christian Eggers <ceggers@...i.de>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v7 4/5] nvmem: eeprom: at25: export FRAM serial num



On 08. 06. 21 11:03, Greg Kroah-Hartman wrote:
> On Mon, Jun 07, 2021 at 04:47:44PM +0200, Jiří Prchal wrote:
>>
>>
>> On 07. 06. 21 14:36, Greg Kroah-Hartman wrote:
>>> On Mon, Jun 07, 2021 at 02:26:39PM +0200, Jiri Prchal wrote:
>>>> +	return sysfs_emit(buf, "%016llx\n", *(unsigned long long *)at25->sernum);
>>>
>>> That's a horrid hack, why not use the %*phN modifier?
>>
>> Prints as little endian, is that OK?
> 
> You tell me!  What tool is going to be reading this?  What do they
> expect it to look like?

sh, php in my usecase as unique id.
So endianess does not matter to me too much. The question is what is 
usual (like mac address, uuid...?).

> And it's a byte array, why would there be endian issues?

Now is printed as one big number. Not real issue. Just human 
readability? Should I turn back it to space separated bytes?

J