Date:   Thu, 18 Jun 2020 13:01:37 +0000
From:   <Eugen.Hristev@...rochip.com>
To:     <alexandru.Ardelean@...log.com>, <Jonathan.Cameron@...wei.com>
CC:     <lars@...afoo.de>, <alexandre.torgue@...com>,
        <linux-iio@...r.kernel.org>, <s.hauer@...gutronix.de>,
        <linux-kernel@...r.kernel.org>, <songqiang1304521@...il.com>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <mcoquelin.stm32@...il.com>, <lorenzo.bianconi83@...il.com>,
        <shawnguo@...nel.org>, <linus.walleij@...aro.org>,
        <jic23@...nel.org>
Subject: Re: [PATCH v2 3/3] iio: remove
 iio_triggered_buffer_postenable()/iio_triggered_buffer_predisable()

On 17.06.2020 16:52, Ardelean, Alexandru wrote:
> On Wed, 2020-06-17 at 13:37 +0000, Eugen.Hristev@...rochip.com wrote:
>> [External]
>>
>> On 02.06.2020 11:54, Jonathan Cameron wrote:
>>> On Tue, 2 Jun 2020 07:50:23 +0000
>>> "Ardelean, Alexandru" <alexandru.Ardelean@...log.com> wrote:
>>>
>>>> On Sun, 2020-05-31 at 16:40 +0100, Jonathan Cameron wrote:
>>>>> On Mon, 25 May 2020 14:38:55 +0300
>>>>> Alexandru Ardelean <alexandru.ardelean@...log.com> wrote:
>>>>>
>>>>>> From: Lars-Peter Clausen <lars@...afoo.de>
>>>>>>
>>>>>> This patch should be squashed into the first one, as the first one is
>>>>>> breaking the build (intentionally) to make the IIO core files easier
>>>>>> to
>>>>>> review.
>>>>>>
>>>>>> Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
>>>>>> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
>>>>>> ---
>>>>>
>>>>> Friend poke.  Version log?
>>>>
>>>> Version log is in the first patch.
>>>> I was wondering if I omitted it.
>>>> Seems, this time I didn't. But I admit, it probably would have been better
>>>> here.
>>> Ah fair enough.  That works fine if there is a cover letter but not
>>> so much just putting things in the first patch!
>>>>> Other than the wistful comment below (which I'm not expecting you to
>>>>> do anything about btw!) whole series looks good to me.
>>>>>
>>>>> These are obviously no functional changes (I think) so it's only really
>>>>> patch 2 that
>>>>> could do with more eyes and acks.
>>>>>
>>>>> Far as I can tell that case is fine as well because of the protections
>>>>> on being in the right mode, but more eyes on that would be great.
>>>>>
>>>>> So assuming that's fine, what commit message do you want me to use for
>>>>> the fused single patch?
>>>>
>>>> Commit message-wise: I think the message in the first commit would be
>>>> mostly sufficient.
>>>> No idea what other description would be needed.
>>>>
>>>> So, maybe something like:
>>>>
>>>> ----------------------------------------------------------------------
>>>> All devices using a triggered buffer need to attach and detach the trigger
>>>> to the device in order to properly work. Instead of doing this in each and
>>>> every driver by hand move this into the core.
>>>>
>>>> At this point in time, all drivers should have been resolved to
>>>> attach/detach the poll-function in the same order.
>>>>
>>>> This patch removes all explicit calls of iio_triggered_buffer_postenable()
>>>> & iio_triggered_buffer_predisable() in all drivers, since the core handles
>>>> now the pollfunc attach/detach.
>>>>
>>>> The more peculiar change is for the 'at91-sama5d2_adc' driver, since it's
>>>> not obvious that removing the hooks doesn't break anything**
>>>> ----------------------------------------------------------------------
>>>>
>>>
>>> Looks good.
>>>
>>>> ** for the comment about 'at91-sama5d2_adc', we really do need to get some
>>>> testing; otherwise this risks breaking it.
>>
>> Hi,
>>
>> I can test it, do we have any patchwork so I can easily download the
>> patches ?
>> I have issues when applying them.
> 
> Is this good?
> 
> https://patchwork.kernel.org/patch/11568743/
> Series:
> https://patchwork.kernel.org/project/linux-iio/list/?series=293141
> 
> Many thanks
> Alex

On at91-sama5d2-adc driver, sama5d2-xplained board,
Tested-by: Eugen Hristev <eugen.hristev@...rochip.com>

I applied all three patches and tested together with the other patch on 
sama5d2-adc driver.
It looks to be working fine. If I discover something later, I will let 
you know.
Thanks

> 
>>
>> Thanks !
>>
>>> Agreed.
>>>
>>>>
>>>>> Thanks,
>>>>>
>>>>> Jonathan
>>>>>
>>>>>>    static const struct iio_trigger_ops atlas_interrupt_trigger_ops = {
>>>>>> diff --git a/drivers/iio/dummy/iio_simple_dummy_buffer.c
>>>>>> b/drivers/iio/dummy/iio_simple_dummy_buffer.c
>>>>>> index 17606eca42b4..8e13c53d4360 100644
>>>>>> --- a/drivers/iio/dummy/iio_simple_dummy_buffer.c
>>>>>> +++ b/drivers/iio/dummy/iio_simple_dummy_buffer.c
>>>>>> @@ -99,20 +99,6 @@ static irqreturn_t iio_simple_dummy_trigger_h(int
>>>>>> irq, void *p)
>>>>>>    }
>>>>>>
>>>>>>    static const struct iio_buffer_setup_ops
>>>>>> iio_simple_dummy_buffer_setup_ops = {
>>>>>> - /*
>>>>>> -  * iio_triggered_buffer_postenable:
>>>>>> -  * Generic function that simply attaches the pollfunc to the
>>>>>> trigger.
>>>>>> -  * Replace this to mess with hardware state before we attach the
>>>>>> -  * trigger.
>>>>>> -  */
>>>>>> - .postenable = &iio_triggered_buffer_postenable,
>>>>>> - /*
>>>>>> -  * iio_triggered_buffer_predisable:
>>>>>> -  * Generic function that simple detaches the pollfunc from the
>>>>>> trigger.
>>>>>> -  * Replace this to put hardware state back again after the trigger
>>>>>> is
>>>>>> -  * detached but before userspace knows we have disabled the ring.
>>>>>> -  */
>>>>>> - .predisable = &iio_triggered_buffer_predisable,
>>>>>>    };
>>>>>>
>>>>> Hmm. Guess we should probably 'invent' a reason to illustrate the bufer
>>>>> ops in the dummy example.  Anyone feeling creative?
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