linux-kernel - Re: [PATCH v5 1/8] clocksource: dmtimer: Remove all the exports

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Date:   Tue, 12 Dec 2017 13:38:04 +0530
From:   Keerthy <j-keerthy@...com>
To:     Ladislav Michl <ladis@...ux-mips.org>, <tony@...mide.com>
CC:     <daniel.lezcano@...aro.org>, <aaro.koskinen@....fi>,
        <thierry.reding@...il.com>, <grygorii.strashko@...com>,
        <linux-omap@...r.kernel.org>, <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-pwm@...r.kernel.org>, <sebastian.reichel@...labora.co.uk>,
        <linux-kernel@...r.kernel.org>, <t-kristo@...com>,
        <linux@...linux.org.uk>
Subject: Re: [PATCH v5 1/8] clocksource: dmtimer: Remove all the exports



On Tuesday 12 December 2017 01:31 PM, Ladislav Michl wrote:
> On Tue, Dec 12, 2017 at 01:01:51PM +0530, Keerthy wrote:
>>
>>
>> On Tuesday 12 December 2017 12:46 PM, Ladislav Michl wrote:
>>> Keerthy,
>>>
>>> On Tue, Dec 12, 2017 at 11:42:10AM +0530, Keerthy wrote:
>>>> Remove all the unwanted exports from the driver
>>>
>>> I'm adding event capture capability to the pwm-omap driver and so far used
>>> v4.15-rc3 as codebase.
>>>
>>> Intended use is an IR receiver; for that I need to measure pulses width and
>>> spaces between pulses. So DM timer was setup to generate interupt after
>>> both TCAR1 and TCAR2 are filled, values are passed to IR decoder and
>>> TCAR_IT_FLAG is cleared.
>>>
>>> Of course, this is just proof of concept and needs to be polished and
>>> generalized, but to make it at least work I need functions you just
>>> unexported (plus some new).
>>>
>>> Question is whenever we need this level of indirection (omap_dm_timer_ops)
>>> or plain exports are enough.
>>
>> The general guidance is not to do plain exports and go via
>> omap_dm_timer_ops.
> 
> ...in contrary what other clocksource drivers are doing.
> 
> Now I'm assuming it is okay to extend omap_dm_timer_ops. That would mean
> check for ops members to be assigned should be also extended or we should
> delete it altogether and assume all members are populated?

It should be fine to extend omap_dm_timer_ops. What are the ops missing
for your new implementation?

Tony,

Your thoughts on the above?

Regards,
Keerthy
> 
> Thanks,
> 	ladis
>