linux-kernel - Re: [PATCH RFC 0/4] i2c: at91: slave mode support

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Date:   Tue, 31 Oct 2017 15:07:40 +0100
From:   Ludovic Desroches <ludovic.desroches@...rochip.com>
To:     Juergen Fitschen <me@....yt>
CC:     Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Wolfram Sang <wsa@...-dreams.de>, <linux-i2c@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC 0/4] i2c: at91: slave mode support

Hello Juergen,

On Fri, Oct 27, 2017 at 05:10:58PM +0200, Juergen Fitschen wrote:
> Based on the discussion we had on the i2c-linux list [1], I wrote a patch for
> AT91 hardware and tried to fulfill the Linux I2C slave interface description
> [2] as good as possible. This enables aforementioned hardware to act as an I2C
> slave that can be accessed by a remote I2C master.

I am sorry, I missed the first discussion since I was on vacation on not in Cc.

So thanks a lot for trying to mainline your work. For sure it will be
useful.

> 
> I have tested this patchset successfully on an ATSAMA5D27 with the
> i2c-slave-eeprom backend for some time and I'm convinced that it works stable
> enough to be reviewed by you.

I never used our I2C controller in slave mode so I'll try to test it on
SAMA5D2 but also with older SoCs.

> 
> Since I am a newcomer to kernel coding, I really would like to hear your
> comments on this patchset.

IMO, it sounds pretty good.

Regards

Ludovic

> 
> [1] https://marc.info/?t=150824004800001&r=1&w=1
> [2] https://www.kernel.org/doc/Documentation/i2c/slave-interface
> 
> Juergen Fitschen (4):
>   i2c: at91: segregate master mode specific code from probe and init
>     func
>   i2c: at91: split driver into core and master file
>   i2c: at91: added slave mode support
>   i2c: at91: take slave mode capabilities of hardware into account
> 
>  MAINTAINERS                          |    3 +-
>  drivers/i2c/busses/Makefile          |    4 +
>  drivers/i2c/busses/i2c-at91-core.c   |  390 +++++++++++
>  drivers/i2c/busses/i2c-at91-master.c |  804 ++++++++++++++++++++++
>  drivers/i2c/busses/i2c-at91-slave.c  |  147 ++++
>  drivers/i2c/busses/i2c-at91.c        | 1243 ----------------------------------
>  drivers/i2c/busses/i2c-at91.h        |  184 +++++
>  7 files changed, 1531 insertions(+), 1244 deletions(-)
>  create mode 100644 drivers/i2c/busses/i2c-at91-core.c
>  create mode 100644 drivers/i2c/busses/i2c-at91-master.c
>  create mode 100644 drivers/i2c/busses/i2c-at91-slave.c
>  delete mode 100644 drivers/i2c/busses/i2c-at91.c
>  create mode 100644 drivers/i2c/busses/i2c-at91.h
> 
> --
> 2.7.4