linux-kernel - Re: [RFC PATCH 0/2] check I2C device id for pca984x chips

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Date:   Sat, 27 Jan 2018 09:37:19 +0100
From:   Peter Rosin <peda@...ntia.se>
To:     Adrian Fiergolski <Adrian.Fiergolski@...n.ch>
Cc:     Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/2] check I2C device id for pca984x chips

On 2018-01-26 17:33, Adrian Fiergolski wrote:
> Hi Peter,
> 
> Sorry for the late reply.

No problem.

> Yes, it's true I have one of the chip. However, my yocto based build system
> depends on https://github.com/Xilinx/linux-xlnx and it's in version
> 4.9.0-xilinx-v2017.3.
> Apparently, there were some bigger changes in i2c core between this
> version and
> upstream, thus your patches don't apply.

I think the core changes fail to apply mostly because of the file renaming
that has been going on, and that it should be fairly trivial to adapt.
But I don't know for certain...

> Next week I will try to align only me i2c subdirectory with upstream.
> Provided it compiles, I will
> try then to apply and confirm your patches.

I'm looking forward to feedback, thanks!

Cheers,
Peter

> Regards,
> Adrian
> 
> On 22.01.2018 at 12:36, Peter Rosin wrote:
>> Hi!
>>
>> This series tries to check the I2C device id, but instead of open
>> coding the check in the pca954x driver, I have a new function in
>> the core doing the work.
>>
>> The code is only compile-tested, hence the RFC, and I would really
>> like a Tested-by: tag from Adrian who presumably have one of these
>> chips.
>>
>> Also, I'm not sure if I should list all manufacturers that I know
>> about in the header, or if I should settle for the one that is
>> actually used and leave the others to be added by whomever needs
>> them...
>>
>> Cheers,
>> peda
>>
>> Peter Rosin (2):
>>   i2c: add i2c_get_device_id() to get the standard i2c device id
>>   i2c: mux: pca954x: verify the device id of the pca984x chips
>>
>>  drivers/i2c/i2c-core-base.c         | 33 ++++++++++++++++++++++++++++
>>  drivers/i2c/muxes/i2c-mux-pca954x.c | 43 +++++++++++++++++++++++++++++++++++++
>>  include/linux/i2c.h                 | 30 ++++++++++++++++++++++++++
>>  3 files changed, 106 insertions(+)
>>
>