linux-kernel - Re: [RFC PATCH 1/2] i2c: add i2c_get_device_id() to get the standard i2c device id

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Date:   Mon, 5 Mar 2018 16:51:11 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Peter Rosin <peda@...ntia.se>
Cc:     Adrian Fiergolski <adrian.fiergolski@...n.ch>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/2] i2c: add i2c_get_device_id() to get the standard
 i2c device id

On Mon, Jan 22, 2018 at 12:36:56PM +0100, Peter Rosin wrote:
> Can be used during probe to double check that the probed device is
> what is expected.
> 
> Loosely based on code from Adrian Fiergolski <adrian.fiergolski@...n.ch>.
> 
> Signed-off-by: Peter Rosin <peda@...ntia.se>

In general, nice! I wanted to have such a function in the core but never
had a device to test it with. So, much appreciated.

Looks mostly good, except...

> +	ret = i2c_smbus_xfer(adap, I2C_ADDR_DEVICE_ID, client->flags,

We shouldn't pass the flag of the clients (like PEC) here. I'd think it
could be plain 0 but please double-check.

> +/**
> + * struct i2c_device_identity - i2c client device identification
> + * @manufacturer_id: 0 - 4095, database maintained by NXP
> + * @part_id: 0 - 511, according to manufacturer
> + * @die_revision: 0 - 7, according to manufacturer
> + */

All is nicely documented, very good!

About the upstreaming procedure: Could you just make a seperate
pull-request out of this feature? I'll pull that in to have it in my
tree and you can still collect patches in your usual for-next branch.

When the above is fixed you can add my:

Reviewed-by: Wolfram Sang <wsa@...-dreams.de>

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