linux-kernel - Re: [PATCH v10] mmc: Export host capabilities to debugfs.

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Date:   Fri, 16 Mar 2018 08:57:40 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Harish Jenny K N <harish_kandiga@...tor.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Shawn Lin <shawn.lin@...k-chips.com>, avri.altman@....com,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Vladimir Zapolskiy <Vladimir_Zapolskiy@...tor.com>
Subject: Re: [PATCH v10] mmc: Export host capabilities to debugfs.

On 16 March 2018 at 05:20, Harish Jenny K N <harish_kandiga@...tor.com> wrote:
>
>
> On Thursday 15 March 2018 05:59 PM, Ulf Hansson wrote:
>> On 15 March 2018 at 11:26, Andy Shevchenko
>> <andriy.shevchenko@...ux.intel.com> wrote:
>>> On Thu, 2018-03-15 at 11:12 +0100, Ulf Hansson wrote:
>>>> On 13 March 2018 at 06:10, Harish Jenny K N <harish_kandiga@...tor.com
>>>>> wrote:
>>>>>
>>>> Honestly, I don't like this, but maybe other people do, then I am fine
>>>> with this approach.
>>>>
>>>> If were to decide, I would just rather print the caps field in a
>>>> hexadecimal bit form and leave the translation to the user.
>>> A compromise would be to print both:
>>>
>>> 0xHHHHHHHH\n
>>> Description of each enabled field, one per line
>>>
>>>
>>> Another format would be:
>>>
>>> Bit XX: Description of a field
>> If we were to print the description, there is no point in printing the
>> bits in hex. Or is it?
> Yes. I also do not see the use of printing hex value if we are printing the description.
>
>>
>> As I said, if you and other folkz thinks this is valuable, then I am
>> fine as well. Just saying, it's not my preferred option.
>>
>>
>
>
> I just want to inform that the idea of printing the description came after discussion in https://www.spinics.net/lists/linux-mmc/msg48246.html, where it was decided adding utility in mmc-utils was not going to work ( reason:  We may very well be changing the bit offsets for the caps and caps2 in the mmc kernel header, keeping a copy of them is not a good idea. It's just a matter of *when* it will break).

I recall. However, I didn't realize all these strings were going to be
needed. :-)

>
> On Thu, 2018-03-15 at 11:12 +0100, Ulf Hansson wrote:
>> If were to decide, I would just rather print the caps field in a hexadecimal bit form and leave the translation to the user.
>
> I think translation becomes difficult for the above reason and hence I would prefer printing the description.

Okay.

>
> Note: Printing values in Hex was the original idea and it is also available in https://www.spinics.net/lists/linux-mmc/msg48213.html just in case if it is required.

Yeah, so maybe I should apply that one, then we can take it from there!?

Kind regards
Uffe