linux-kernel - Re: [PATCH] drivers/hwmon/emc1403.c: add support for emc1412

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Date:	Mon, 12 May 2014 08:59:31 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Jean Delvare <jdelvare@...e.de>
Cc:	Josef Gajdusek <atx@....name>, lm-sensors@...sensors.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/hwmon/emc1403.c: add support for emc1412

On Mon, May 12, 2014 at 08:10:51AM +0200, Jean Delvare wrote:
> Hi Guenter, Josef,
> 
> On Sun, 11 May 2014 15:40:21 -0700, Guenter Roeck wrote:
> > On 05/11/2014 06:00 AM, Josef Gajdusek wrote:
> > > @@ -366,14 +433,19 @@ static int emc1403_probe(struct i2c_client *client,
> > >   }
> > >
> > >   static const unsigned short emc1403_address_list[] = {
> > > -	0x18, 0x29, 0x4c, 0x4d, I2C_CLIENT_END
> > > +	/* emc1403/emc1404/emc1423/emc1424 */
> > > +	0x4c, 0x4d, 0x18, 0x29,
> > > +	/* emc1412 */
> > > +	0x5c, 0x4c, 0x6c, 0x1c, 0x3c, I2C_CLIENT_END
> > 
> > No duplication of addresses, and addresses are by convention in order.
> > Jean, any addresses which should not be scanned ?
> 
> 0x3c and 0x6c should indeed not be scanned, sensors-detect does not
> scan them as they aren't typically used by hwmon devices. 0x5c is
> questionable (currently scanned, but used only by a limited number of
> chips, we may drop it at some point.) 0x1c and 0x4c are OK to scan.
> 
Hi Jean,

I only see the adt7462 driver scanning for 0x5c. Guess I'll accept the
address for now; I don't see a good reason not to.

Couple of other questions:
- would it make sense to relax store_hyst to not return ERANGE but use clamp_val
  instead ?
- Currently hyst can be stored for all crit attributes even though there is only
  one hyst register. Should we change this to only support writing it for
  temp1_crit_hyst ?
- I might convert the driver to use regmap if I find the time. Do you have any
  concerns with that ?

Thanks,
Guenter
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