linux-kernel - Re: [PATCH v1 1/1] hwmon: (emc1403) Add support for EMC1444

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Message-ID: <20190226193805.GA17740@roeck-us.net>
Date:   Tue, 26 Feb 2019 11:38:05 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Shravan Kumar Ramani <sramani@...lanox.com>
Cc:     Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] hwmon: (emc1403) Add support for EMC1444

On Tue, Feb 26, 2019 at 10:40:05AM -0500, Shravan Kumar Ramani wrote:
> EMC1444 is compatible with EMC1404. Add it to device ID table.
> 

Is that some super-secretive chip ? The Microchip website completely fails
to provide information about it. It lists a chip with that name under
"Microcontrollers and Processors", but with no documentation whatsoever.
And it seems like similar secretive chips such as emc1442 may exist as well.
I am hesitant to approve this without datasheet. The chips in this series
have a lot of registers, and I don't really trust the vendor to be
consistent across chip generations - even more so if they think that
they need to keep datasheets (and even basic information about the chip)
under wrap.

Until more information is available, I would suggest to instantiate
the chip as emc1424.

Guenter

> Reviewed-by: David Thompson <dthompson@...lanox.com>
> Signed-off-by: Shravan Kumar Ramani <sramani@...lanox.com>
> ---
>  drivers/hwmon/emc1403.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/hwmon/emc1403.c b/drivers/hwmon/emc1403.c
> index bdab47a..88f6a40 100644
> --- a/drivers/hwmon/emc1403.c
> +++ b/drivers/hwmon/emc1403.c
> @@ -453,6 +453,7 @@ static const struct i2c_device_id emc1403_idtable[] = {
>  	{ "emc1422", emc1402 },
>  	{ "emc1423", emc1403 },
>  	{ "emc1424", emc1404 },
> +	{ "emc1444", emc1404 },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
> -- 
> 2.1.2
>