linux-kernel - Re: [PATCH 3/3] media: Add support for the AM/FM radio chip KT0913 from KT Micro.

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Date:   Fri, 17 Jul 2020 12:04:24 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Joe Perches <joe@...ches.com>,
        Santiago Hormazabal <santiagohssl@...il.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] media: Add support for the AM/FM radio chip KT0913
 from KT Micro.

On 17/07/2020 11:51, Joe Perches wrote:
> On Fri, 2020-07-17 at 11:29 +0200, Hans Verkuil wrote:
>> It's standard linux codingstyle to use lowercase for hex numbers.
>> Can you change that throughout the source for the next version?
> 
> Is there a standard?  It's not in coding-style.rst.
> 
> While I prefer lowercase too, it seems the kernel has
> only ~2:1 preference for lowercase to uppercase hex.
> 
> $ git grep -ohP '\b0[xX][0-9a-f]+\b' | grep [a-f] | wc -l
> 1149833
> $ git grep -ohP '\b0[xX][0-9A-F]+\b' | grep [A-F] | wc -l
> 575781
> 
> 

Well, it's indeed not a standard for the kernel as a whole, but certainly
for drivers/media:

$ git grep -ohP '\b0[xX][0-9a-f]+\b' drivers/media/ | grep [a-f] | wc -l
109272
$ git grep -ohP '\b0[xX][0-9A-F]+\b' drivers/media/ | grep [A-F] | wc -l
22392

The media subsystem has a 5:1 preference for lowercase. And uppercase is
mostly found in older drivers.

Still, I really prefer lowercase over uppercase, especially in new drivers.

Regards,

	Hans