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: Mon, 18 Jun 2018 13:32:47 +0200	[thread overview]
Message-ID: <b860025e-3d4b-f333-80b4-3831dd969757@axentia.se> (raw)
In-Reply-To: <20180618110502.cb5s24srp4frahm6@ninjato>

On 2018-06-18 13:05, Wolfram Sang wrote:
> 
>> +static inline void
>> +i2c_lock_segment(struct i2c_adapter *adapter)
>> +{
>> +	i2c_lock_bus(adapter, I2C_LOCK_SEGMENT);
>> +}
>> +
>> +static inline int
>> +i2c_trylock_segment(struct i2c_adapter *adapter)
>> +{
>> +	return i2c_trylock_bus(adapter, I2C_LOCK_SEGMENT);
>> +}
>> +
>> +static inline void
>> +i2c_unlock_segment(struct i2c_adapter *adapter)
>> +{
>> +	i2c_unlock_bus(adapter, I2C_LOCK_SEGMENT);
>> +}
> 
> 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?

Cheers,
Peter