linux-kernel - Re: [PATCH 1/2] i2c-mv64xxx: Add I2C Transaction Generator support

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Message-ID: <20130607182157.34188f72@skate>
Date:	Fri, 7 Jun 2013 18:21:57 +0200
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>, Nicolas Pitre <nico@...xnic.net>,
	Lior Amsalem <alior@...vell.com>,
	Maen Suleiman <maen@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Shadi Ammouri <shadi@...vell.com>,
	Eran Ben-Avi <benavi@...vell.com>,
	Yehuda Yitschak <yehuday@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Ike Pan <ike.pan@...onical.com>,
	Chris Van Hoof <vanhoof@...onical.com>,
	Dan Frazier <dann.frazier@...onical.com>,
	Leif Lindholm <leif.lindholm@....com>,
	Jon Masters <jcm@...hat.com>,
	David Marlin <dmarlin@...hat.com>,
	linux-kernel@...r.kernel.org, Zbigniew Bodek <zbb@...ihalf.com>,
	Piotr Ziecik <kosmo@...ihalf.com>
Subject: Re: [PATCH 1/2] i2c-mv64xxx: Add I2C Transaction Generator support

Dear Gregory CLEMENT,

On Fri,  7 Jun 2013 17:42:22 +0200, Gregory CLEMENT wrote:

>  /* Driver states */
>  enum {
>  	MV64XXX_I2C_STATE_INVALID,
> @@ -110,6 +133,7 @@ struct mv64xxx_i2c_data {
>  	spinlock_t		lock;
>  	struct i2c_msg		*msg;
>  	struct i2c_adapter	adapter;
> +	int			bridge_enabled;

bool ?

> @@ -528,6 +652,7 @@ mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data,
>  {
>  	u32 bus_freq, tclk;
>  	int rc = 0;
> +	const char *bridge_status;
>  
>  	/* CLK is mandatory when using DT to describe the i2c bus. We
>  	 * need to know tclk in order to calculate bus clock
> @@ -554,6 +679,15 @@ mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data,
>  	 * So hard code the value to 1 second.
>  	 */
>  	drv_data->adapter.timeout = HZ;
> +
> +	/*
> +	 * Acquire information on Transaction Generator support.
> +	 */
> +	bridge_status = of_get_property(np, "", NULL);

It is not clear to me what this new bridge_status local variable is
doing.

> +	if (of_property_read_bool(np, "i2c,i2c-bridge"))
> +		drv_data->bridge_enabled = 1;
> +	else
> +		drv_data->bridge_enabled = 0;

This could be written directly as:

	drv_data->bridge_enabled = of_property_read_bool(np, "i2c,i2c-bridge");

Thanks,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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