linux-kernel - Re: [PATCH V2 3/7] driver/core: cpu: initialize opp table

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Message-ID: <CAKohpo=-kmfH9Z+m8E9HQXs4AvRoUCDzcrns6-HHLH=AqeJ-DQ@mail.gmail.com>
Date:	Wed, 21 May 2014 19:31:01 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arvind Chauhan <Arvind.Chauhan@....com>,
	"inderpal.s@...sung.com" <inderpal.s@...sung.com>,
	"nm@...com" <nm@...com>,
	"chander.kashyap@...aro.org" <chander.kashyap@...aro.org>,
	"pavel@....cz" <pavel@....cz>,
	"len.brown@...el.com" <len.brown@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Amit Daniel Kachhap <amit.daniel@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Shawn Guo <shawn.guo@...aro.org>
Subject: Re: [PATCH V2 3/7] driver/core: cpu: initialize opp table

On 21 May 2014 19:15, Sudeep Holla <sudeep.holla@....com> wrote:
> [Nit] Not sure if we need this logging on each cpu, may be dev_dbg if you
> still
> fancy one ? :)

It wouldn't happen on each CPU, but one CPU per policy as others
would return -ENODEV.

I added dev_dbg earlier but then I thought dev_info is better as we may
better show this to everybody as it about the most important device,
i.e. CPU :)

>> +       /* Print error only if there is an issue with OPP table */
>> +       else if (error != -ENOSYS && error != -ENODEV)
>> +               dev_err(&cpu->dev, "%s: failed to init OPP table for
>> cpu%d, err: %d\n",
>> +                       __func__, cpu->dev.id, error);
>> +}
>> +#else
>> +static inline void of_init_cpu_opp_table(struct cpu *cpu) {}
>> +#endif
>> +
>
>
> IMO this could be more generic and applicable for any device if you replace
> "struct cpu" with "struct device". I know this is currently used by cpu but
> we can extend it's use for any device if needed in future. You can then move
> this to pm_opp.h as of_init_dev_opp_table may be.

Probably we will call of_init_opp_table() directly for other devices, as this
function doesn't do anything else, apart from some prints.. So, probably
leave is as is for now, unless a real need arises ?
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