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

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Date:   Thu, 2 Nov 2023 08:26:12 -0500
From:   Patrick Williams <patrick@...cx.xyz>
To:     Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>
Cc:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] hwmon: emc1403: Add support for EMC1442

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>

-- 
Patrick Williams

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