Re: [PATCH 3/3] mfd: cs42l43: Add support for new cs42l44 variant

On Thu, Jul 16, 2026 at 04:14:37PM +0100, Lee Jones wrote:
> On Wed, 08 Jul 2026, Charles Keepax wrote:
> > The cs42l44 is a cost optimised variant of cs42l43b. Add basic support
> > for this new device.
> > 
> > Signed-off-by: Charles Keepax <[email protected]>
> > ---
> >  	switch (devid) {
> >  	case CS42L43_DEVID_VAL:
> > +		valid_id = (cs42l43->variant_id == CS42L43_DEVID_VAL);
> > +		break;
> >  	case CS42L43B_DEVID_VAL:
> > -		if (devid != cs42l43->variant_id) {
> > -			dev_err(cs42l43->dev,
> > -				"Device ID (0x%06x) does not match variant ID (0x%06lx)\n",
> > -				devid, cs42l43->variant_id);
> > -			goto err;
> > -		}
> 
> Needs a fall-through statement.

I thought they weren't typically used if the case had no content,
the resultant code looks like:

case CS42L43B_DEVID_VAL:
case CS42L44_DEVID_VAL:
	valid_id = (cs42l43->variant_id == CS42L43B_DEVID_VAL);
	break;

But happy to add one if we really want it?

> > +	case CS42L44_DEVID_VAL:
> > +		valid_id = (cs42l43->variant_id == CS42L43B_DEVID_VAL);
> >  		break;
> >  	default:
> >  		dev_err(cs42l43->dev, "Unrecognised devid: 0x%06x\n", devid);
> >  		goto err;
> >  	}
> >  
> > +	if (!valid_id) {
> 
> How is this nor handled in the default branch?

The default case ends in goto err; so this doesn't run in that
case.

Thanks,
Charles