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

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Message-id: <017301cc314c$37839eb0$a68adc10$@com>
Date:	Thu, 23 Jun 2011 11:21:10 +0900
From:	Sangbeom Kim <sbkim73@...sung.com>
To:	'Mark Brown' <broonie@...nsource.wolfsonmicro.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 10:29 AM +0900, Mark Brown 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.

OK, After reviewing your patch, I will apply  it.

> > > > +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?
Just want to make same type.

Thanks,
SB Kim

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