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

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Date:   Fri, 16 Mar 2018 09:50:40 +0530
From:   Harish Jenny K N <harish_kandiga@...tor.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     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 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).

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.

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.




Thanks & Regards,
Harish Jenny K N