linux-kernel - Re: [PATCH 3/3] mfd: Add I2C control support for S5M8751

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Message-ID: <20110623012841.GF20949@opensource.wolfsonmicro.com>
Date:	Thu, 23 Jun 2011 02:28:41 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Sangbeom Kim <sbkim73@...sung.com>
Cc:	sameo@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] mfd: Add I2C control support for S5M8751

On Thu, Jun 23, 2011 at 10:25:37AM +0900, Sangbeom Kim wrote:

> Thank for your comment,
> We have a few PMIC (S5M8751, S5M8752 and others).
> They have different features. And Each one will have separate core file.
> But i2c interface is same.
> So, I try to separate i2s code.
> I would modify prefix like s5m87xx.

In that case you should definitely take a look at the regmap API I've
been posting.  It factors all the device I/O stuff out so you should be
able to just tell it that you have a device with n bit registers and n
bit values and it'll provide all the I/O functions you need.  I just
reposted it today, though it needs another round for some SPI stuff.

> > > +static int s5m8751_i2c_read_device(struct s5m8751 *s5m8751, uint8_t
> reg,
> > > +					uint8_t *val)
> > > +{
> > > +	int ret;
> > > +	ret = i2c_smbus_read_byte_data(s5m8751->i2c_client, reg);
> > > +	if (ret < 0) {
> > > +		dev_err(s5m8751->dev, "failed reading at 0x%02x\n", reg);
> > > +		return ret;
> > > +	}
> > > +	*val = (uint8_t)ret;

> > Why is this case required?

> I want pass the read value by val

Sorry, typo - why is this *cast* required?
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