linux-kernel - RE: [PATCH v1] hwmon: emc1403: Add support for EMC1442

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Date:   Wed, 1 Nov 2023 08:45:15 +0000
From:   Delphine_CC_Chiu/WYHQ/Wiwynn <Delphine_CC_Chiu@...ynn.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Patrick Williams <patrick@...cx.xyz>,
        Krish Skandakumaran <krishskanda@...a.com>
CC:     Jean Delvare <jdelvare@...e.com>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v1] hwmon: emc1403: Add support for EMC1442



> -----Original Message-----
> From: Guenter Roeck <groeck7@...il.com> On Behalf Of Guenter Roeck
> Sent: Wednesday, November 1, 2023 12:57 PM
> To: Patrick Williams <patrick@...cx.xyz>
> Cc: Delphine_CC_Chiu/WYHQ/Wiwynn <Delphine_CC_Chiu@...ynn.com>;
> Jean Delvare <jdelvare@...e.com>; linux-hwmon@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v1] hwmon: emc1403: Add support for EMC1442
> 
>   Security Reminder: Please be aware that this email is sent by an external
> sender.
> 
> On 10/31/23 19:27, Patrick Williams wrote:
> > On Tue, Oct 31, 2023 at 04:01:10PM -0700, Guenter Roeck wrote:
> >> On Tue, Oct 31, 2023 at 04:58:06PM +0800, Delphine CC Chiu wrote:
> >>> Add support for EMC1442 which is compatible with EMC1403.
> >>>
> >>
> >> Unfortunately, almost no information is available about this chip
> >> except that it ships in an 8-pin package. Are you sure the chip
> >> supports two external temperature sensors like EMC1403 ?
> >> The chip numbering and the number of pins would suggest that it only
> >> supports a single external temperature sensor, which would make it
> >> compatible to emc1402/emc1422.
> >>
> >> Guenter
> >
> > The datasheet I've seen says:
> >
> >>> The EMC1442 monitors two temperature channels (one external and one
> >>> internal).
> >
> > Based on this, I agree that emc1403 seems wrong.  The datasheet also
> > says:
> >
> >>> Pin compatible with EMC1412
> >
> >>
> >>> Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>
> >>> ---
> >>>     { "emc1422", emc1402 },
> >>>     { "emc1423", emc1403 },
> >>>     { "emc1424", emc1404 },
> >>> +   { "emc1442", emc1403 },
> >
> > So, emc1402?
> >
> 
> At the very least, if you are willing to confirm that formally if/when v2 is
> submitted.
> 
> I previously rejected a similar patch adding emc1444 because it was impossible
> to get a datasheet to confirm that the chips are really register compatible. No
> idea why that has to be so secretive. It is a temperature sensor, for heaven's
> sake :-(
> 
> Guenter

Hi Krish,
Would need your confirmation of the device on the NIC.