Re: [PATCH 01/11] i2c: add helpers for locking the I2C segment

From: Peter Rosin <peda@axentia.se>
To: Wolfram Sang <wsa@the-dreams.de>
Cc: linux-kernel@vger.kernel.org, Peter Huewe <peterhuewe@gmx.de>,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	Jason Gunthorpe <jgg@ziepe.ca>, Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Brian Norris <computersforpeace@gmail.com>,
	Gregory Fong <gregory.0xf0@gmail.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	bcm-kernel-feedback-list@broadcom.com,
	Sekhar Nori <nsekhar@ti.com>, Kevin Hilman <khilman@kernel.org>,
	Haavard Skinnemoen <hskinnemoen@gmail.com>,
	Kukjin Kim <kgene@kernel.org>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Orson Zhai <orsonzhai@gmail.com>,
	Baolin Wang <baolin.wang@linaro.org>,
	Chunyan Zhang <zhang.lyra@gmail.com>,
	Laxman Dewangan <ldewangan@nvidia.com>,
	Thierry Reding <thierry.reding@gmail.com>
Subject: Re: [PATCH 01/11] i2c: add helpers for locking the I2C segment
Date: Tue, 19 Jun 2018 23:29:51 +0200	[thread overview]
Message-ID: <4a721b58-d718-68c0-cca5-23b5b21ef100@axentia.se> (raw)
In-Reply-To: <20180618115444.pgjmfntp767zuvmw@ninjato>

On 2018-06-18 13:54, Wolfram Sang wrote:
> 
>>> I wonder if i2c_lock_segment() and i2c_lock_root_adapter() are really
>>> more readable and convenient than i2c_lock_bus() with the flag. I think
>>> the flags have speaking names, too.
>>>
>>> Is that an idea to remove these functions altogether and start using
>>> i2c_lock_bus()?
>>
>> That would be fine with me. I don't have a strong opinion and agree that
>> both are readable enough...
>>
>> It would make for a reduction of the number of lines so that's nice, but
>> the macro in drivers/i2c/busses/i2c-gpio.c (patch 11) would not fit in
>> the current \-width (or whatever you'd call that line of backslashes to
>> the right in a multi-line macro).
>>
>> Does anyone have a strong opinion?
> 
> I have a strong opinion on making i2c.h less bloated. And yes, less
> number of lines is nice, too. I think that surely pays off the
> whitespace exception.

Ok, I have rebased onto v4.18-rc1, killed the i2c-tegra hunk and converted
i2c_lock_root(foo) over to i2c_lock_bus(foo, I2C_LOCK_ROOT_ADAPTER) and
i2c_lock_segment(foo) over to i2c_lock_bus(foo, I2C_LOCK_SEGMENT). And I
of course killed a bunch of locking helpers in i2c.h.

I doing build tests now, will post a v2 in the morning.

Cheers,
Peter