linux-kernel - Re: [PATCH v2] hwmon: emc1403: Add support for EMC1442

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Message-ID: <c448d7e3-c6b6-49e1-bbf1-331d74954a77@roeck-us.net>
Date:   Thu, 2 Nov 2023 07:34:47 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Patrick Williams <patrick@...cx.xyz>,
        Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>
Cc:     Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] hwmon: emc1403: Add support for EMC1442

On 11/2/23 06:26, Patrick Williams wrote:
> On Thu, Nov 02, 2023 at 05:08:07PM +0800, Delphine CC Chiu wrote:
> 
> I have a datasheet for this chip with a "Revision 1.0 (10-25-10)" in the
> footer.  Reviewed the change against the datasheet.
> 
>> Add support for EMC1442 which is compatible with EMC1403.
>>
>> Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>
>> ---
>> change in v2:
>> Revised emc1403 to emc1402
> 
>> +	case 0x60:
>> +		strscpy(info->type, "emc1442", I2C_NAME_SIZE);
>> +		break;
> 
> Confirmed against datasheet.
> 
> Section 2.2 "Register Set Delta" specifies:
>      - Product ID | 60h
> 
>>   static const unsigned short emc1403_address_list[] = {
>> -	0x18, 0x1c, 0x29, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
>> +	0x18, 0x1c, 0x29, 0x3c, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
> 
> Confirmed against datasheet.
> 
> Section 5.1.2 "SMBus Address and RD/WR Bit" has a table indicating that
> a 22k pull-up resistor corresponds to `0011_100?` binary.
> 
>>   	{ "emc1422", emc1402 },
>>   	{ "emc1423", emc1403 },
>>   	{ "emc1424", emc1404 },
>> +	{ "emc1442", emc1402 },
> 
> Datasheet section 2.1 is titled "Functional Delta from EMC1412 to
> EMC1442", with minimal differences.  We map "emc1412" to `emc1402`, so
> mapping "emc1442" to the same should be appropriate.
> 
> 
> Reviewed-by: Patrick Williams <patrick@...cx.xyz>
> 
Thanks. I'll apply, and fix the description while doing so.

Guenter