From mboxrd@z Thu Jan  1 00:00:00 1970
From: swarren@wwwdotorg.org (Stephen Warren)
Date: Thu, 29 Mar 2012 11:48:14 -0600
Subject: [RFC] pinctrl: Replace list_groups() with get_groups_count()
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On 03/29/2012 11:31 AM, viresh kumar wrote:
> On Mar 29, 2012 10:56 PM, Stephen Warren wrote:
>> On 03/29/2012 10:34 AM, viresh kumar wrote:
...
>> I vaguely recall raising the same issue before, and Linus saying he
>> wanted to be consistent with similar list_*() functions in other
>> subsystems, but personally I'd prefer to evaluate this aspect of the
>> pinctrl subsystem on its own.
> 
> Which other subsystems have such stuff?

For example. include/linux/regulator/driver.h struct regulator_ops field
list_voltage().