Re: [PATCH v2 1/8] i2c-mux: add common core data for every mux instance

From: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
To: Peter Rosin <peda@lysator.liu.se>
Cc: Wolfram Sang <wsa@the-dreams.de>, Peter Rosin <peda@axentia.se>,
	Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Ian Campbell <ijc+devicetree@hellion.org.uk>,
	Kumar Gala <galak@codeaurora.org>,
	Peter Korsgaard <peter.korsgaard@barco.com>,
	Guenter Roeck <linux@roeck-us.net>,
	Jonathan Cameron <jic23@kernel.org>,
	Hartmut Knaack <knaack.h@gmx.de>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Peter Meerwald <pmeerw@pmeerw.net>,
	Antti Palosaari <crope@iki.fi>,
	Mauro Carvalho Chehab <mchehab@osg.samsung.com>,
	Frank Rowand <frowand.list@gmail.com>,
	Grant Likely <grant.likely@linaro.org>,
	Adriana Reus <adriana.reus@intel.com>,
	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
	Krzysztof Kozlowski <k.kozlowski@samsung.com>,
	Hans Verkuil <hans.verkuil@cisco.com>,
	Nicholas Mc Guire <hofrat@osadl.org>,
	Olli Salonen <olli.salonen@iki.fi>, <linux-i2c@vger.kernel.org>,
	<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-iio@vger.kernel.org>, <linux-media@vger.kernel.org>
Subject: Re: [PATCH v2 1/8] i2c-mux: add common core data for every mux instance
Date: Thu, 24 Mar 2016 16:24:31 +0200	[thread overview]
Message-ID: <56F3F89F.8000805@mentor.com> (raw)
In-Reply-To: <56F3CA0E.60906@lysator.liu.se>

Hi Peter,

On 24.03.2016 13:05, Peter Rosin wrote:
> Hi Vladimir,
> 
> On 2016-03-24 10:50, Vladimir Zapolskiy wrote:
>> Hi Peter,
>>
>> On 05.01.2016 17:57, Peter Rosin wrote:
>>> From: Peter Rosin <peda@axentia.se>
>>>
>>> The initial core mux structure starts off small with only the parent
>>> adapter pointer, which all muxes have, and a priv pointer for mux
>>> driver private data.
>>>
>>> Add i2c_mux_alloc function to unify the creation of a mux.
>>>
>>> Where appropriate, pass around the mux core structure instead of the
>>> parent adapter or the driver private data.
>>>
>>> Remove the parent adapter pointer from the driver private data for all
>>> mux drivers.
>>>
>>> Signed-off-by: Peter Rosin <peda@axentia.se>
>>
>> is it still under review? If yes, please find one question from me below :)
> 
> Yes, the series is still under review/testing, with an update planned in a
> week or so.
> 
>> [snip]
>>
>>> @@ -196,21 +195,21 @@ static int i2c_arbitrator_probe(struct platform_device *pdev)
>>>  		dev_err(dev, "Cannot parse i2c-parent\n");
>>>  		return -EINVAL;
>>>  	}
>>> -	arb->parent = of_get_i2c_adapter_by_node(parent_np);
>>> +	muxc->parent = of_find_i2c_adapter_by_node(parent_np);
>>
>> why do you prefer here to use "unlocked" version of API?
>>
>> Foe example would it be safe/possible to unload an I2C bus device driver
>> module or unbind I2C device itself in runtime?
> 
> I think you ask why I change from of_get_i2c_... to of_find_i2c_..., and that
> change was not intentional. It was the result of a bad merge during an early
> rebase.
> 
> Does that cover it?
> 

Yep, thank you for clarification, please account this in v3.

I'll try to find some time to review the whole changeset carefully,
in fact I briefly reviewed it two months ago, but I didn't find
anything obviously wrong that time.

--
With best wishes,
Vladimir