linux-kernel - Re: [PATCH 1/2] i2c designware make SCL and SDA falling time configurable

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Date:	Thu, 10 Oct 2013 11:54:13 +1100
From:	Ryan Mallon <rmallon@...il.com>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Romain Baeriswyl <Romain.Baeriswyl@...lis.com>
CC:	Wolfram Sang <wsa@...-dreams.de>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	Pierrick Hascoet <pierrick.hascoet@...lis.com>,
	Vineet Gupta <vgupta@...opsys.com>,
	Christian Ruppert <christian.ruppert@...lis.com>,
	Chiau Ee Chew <chiau.ee.chew@...el.com>,
	Shinya Kuribayashi <skuribay@...ox.com>,
	Jean Delvare <khali@...ux-fr.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
	Romain Baeriswyl <romainba@...lis.com>
Subject: Re: [PATCH 1/2] i2c designware make SCL and SDA falling time configurable

On 09/10/13 18:55, Mika Westerberg wrote:
> On Tue, Oct 08, 2013 at 05:00:54PM +0200, Romain Baeriswyl wrote:
>>  static void __i2c_dw_enable(struct dw_i2c_dev *dev, bool enable)
>> @@ -286,6 +287,7 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
>>  	u32 input_clock_khz;
>>  	u32 hcnt, lcnt;
>>  	u32 reg;
>> +	u32 sda_falling_time, scl_falling_time;
>>  
>>  	input_clock_khz = dev->get_clk_rate_khz(dev);
>>  
>> @@ -307,15 +309,25 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
>>  
>>  	/* set standard and fast speed deviders for high/low periods */
>>  
>> +	if (dev->sda_falling_time)
>> +		sda_falling_time = dev->sda_falling_time;
>> +	else
>> +		sda_falling_time = 300; /* ns */
> 
> I think this looks better:
> 
> 	sda_falling_time = dev->sda_falling_time ? dev->sda_falling_time : 300;

You can also use the gcc-ism, which is a bit more concise:

	sda_falling_time = dev->sda_falling_time ?: 300;

~Ryan

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