linux-kernel - Re: [PATCH 2/3] i2c: Add Congatec CGEB I2C driver

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Date:	Wed, 15 Feb 2012 14:54:13 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Wolfram Sang <w.sang@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org, Samuel Ortiz <sameo@...ux.intel.com>,
	Jean Delvare <khali@...ux-fr.org>, linux-i2c@...r.kernel.org,
	linux-watchdog@...r.kernel.org, Ben Dooks <ben-linux@...ff.org>,
	kernel@...gutronix.de
Subject: Re: [PATCH 2/3] i2c: Add Congatec CGEB I2C driver

On Tue, Feb 07, 2012 at 11:10:16AM +0100, Wolfram Sang wrote:
> Hi Sascha,
> 
> > +config I2C_CONGATEC_CGEB
> > +	tristate "Congatec CGEB I2C driver"
> > +	depends on MFD_CONGATEC_CGEB
> > +	help
> > +	  This driver provides support for the I2C busses accssable via
> > +	  the Congatec CGEB interface found on Congatec boards.
> > +
> 
> Please keep the sorting (eg20t is wrong and will be fixed).
> 
> > +		ret = cgeb_call(priv->board, &fps, CgebI2CTransfer);
> > +		if (ret) {
> > +			ret = -EREMOTEIO;
> > +			goto out;
> > +		}
> 
> -EREMOTEIO is not present in Documentation/i2c/fault-codes. Please use
> one from that file.

-EIO?

> 
> > +	ret = cgeb_i2c_set_speed(priv, 400000);
> > +	if (ret)
> > +		/*
> > +		 * not a critical error, we can continue with the default speed.
> > +		 */
> > +		dev_warn(&pdev->dev, "Could not set speed to 400KHz\n");
> 
> Is it possible to make this configurable? Not all I2C devices support
> 400KHz, 100KHz is OK.

Yes, it is. The problem is more *how* it should be configurable.
Exposing it via sysfs is the only reasonable option I can think
of.

Sascha

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