[U-Boot] [PATCH] designware_i2c: Enhance DesignWare I2C driver address support

[Chin Liang See]

Hi Alexey,

On Wed, 2014-01-15 at 15:30 +0000, Alexey Brodkin wrote:
> On Wed, 2014-01-15 at 08:58 -0600, Chin Liang See wrote:
> > Enhance the DesignWare I2C driver to support address length more
> > than 1 byte. This enhancement is required as some I2C slave
> > device such as EEPROM chip might have 16 bit address byte.
> > diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c
> > index cb2ac04..c0ac5f7 100644
> > --- a/drivers/i2c/designware_i2c.c
> > +++ b/drivers/i2c/designware_i2c.c
> > @@ -205,27 +205,21 @@ static int check_params(uint addr, int alen, uchar *buffer, int len)
> >  		return 1;
> >  	}
> >  
> > -	if (alen > 1) {
> > -		printf("addr len %d not supported\n", alen);
> > -		return 1;
> > -	}
> > -
> > -	if (addr + len > 256) {
> > -		printf("address out of range\n");
> > -		return 1;
> > -	}
> > -
> >  	return 0;
> >  }
> 
> Hi Chin,
> 
> if you strip down functionality of "check_params()" to one single check
> I would recommend you to remove "check_params()" at all and do in-place
> check for "buffer" existence.
> 
> Moreover you may just use "assert" for this check because this buffer is
> passed by u-boot (no need to check every parameter passed to any
> function in run-time) so in production/release build it won't exist at
> all.

Good suggestion. I agreed that we can strip off the check_params. Let me
send the v2 patch. Thanks and have a nice day!

Chin Liang

> 
> Regards,
> Alexey
> 
>