linux-kernel - Re: [PATCH 0/5] Add support for MSCC Ocelot i2c

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Date:   Tue, 17 Jul 2018 14:46:06 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Wolfram Sang <wsa@...-dreams.de>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        James Hogan <jhogan@...nel.org>,
        Paul Burton <paul.burton@...s.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Allan Nielsen <allan.nielsen@...rosemi.com>
Subject: Re: [PATCH 0/5] Add support for MSCC Ocelot i2c

On 17/07/2018 15:21:20+0300, Andy Shevchenko wrote:
> On Tue, 2018-07-17 at 13:48 +0200, Alexandre Belloni wrote:
> > Hi,
> > 
> > Because the designware IP was not able to the the SDA hold time, MSCC
> > has
> > its own implementation. Add support for it and then add i2c on ocelot
> > boards.
> > 
> > I would expect patches 1 to 3 to go through the i2c tree and 4-5
> > through
> > the mips tree once patch 3 has been reviewed by the DT maintainers.
> 
> Without reading datasheet it all feels like a wrong place to put.
> 
> But maybe that SoC (SoC family?) has some update to DesignWare IP.
> Btw, what the version of DW IP it's using? 2.00a? More older, more
> recent?
> 

COMP_VERSION reads 0x3131302A so it is before DW_IC_SDA_HOLD_MIN_VERS.

> 
> > Alexandre Belloni (5):
> >   i2c: designware: factorize setting SDA hold time
> >   i2c: designware: allow IP specific sda_hold_time
> >   i2c: designware: add MSCC Ocelot support
> >   mips: dts: mscc: Add i2c on ocelot
> >   mips: dts: mscc: enable i2c on ocelot_pcb123
> > 
> >  .../bindings/i2c/i2c-designware.txt           |  5 ++-
> >  arch/mips/boot/dts/mscc/ocelot.dtsi           | 19 +++++++++++
> >  arch/mips/boot/dts/mscc/ocelot_pcb123.dts     |  5 +++
> >  drivers/i2c/busses/i2c-designware-common.c    | 33
> > +++++++++++++++++++
> >  drivers/i2c/busses/i2c-designware-core.h      |  3 ++
> >  drivers/i2c/busses/i2c-designware-master.c    | 22 +------------
> >  drivers/i2c/busses/i2c-designware-platdrv.c   | 20 +++++++++++
> >  drivers/i2c/busses/i2c-designware-slave.c     | 22 +------------
> >  8 files changed, 86 insertions(+), 43 deletions(-)
> > 
> 
> -- 
> Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Intel Finland Oy

-- 
Alexandre Belloni, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com