linux-kernel - Re: [PATCH v8 3/3] I2C: mediatek: Add driver for MediaTek MT8173 I2C controller

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Date:	Wed, 20 May 2015 10:53:22 +0800
From:	Eddie Huang <eddie.huang@...iatek.com>
To:	Matthias Brugger <matthias.bgg@...il.com>
CC:	Wolfram Sang <wsa@...-dreams.de>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"Xudong Chen" <xudong.chen@...iatek.com>,
	Liguo Zhang <liguo.zhang@...iatek.com>,
	<linux-i2c@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>,
	Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH v8 3/3] I2C: mediatek: Add driver for MediaTek MT8173
 I2C controller

Hi Matthias,

On Tue, 2015-05-19 at 16:45 +0200, Matthias Brugger wrote:
> 2015-05-18 18:40 GMT+02:00 Eddie Huang <eddie.huang@...iatek.com>:
> > Add mediatek MT8173 I2C controller driver. Compare to I2C controller
> > of earlier mediatek SoC, MT8173 fix write-then-read limitation, and
> > also increase message size to 64kb.
> >
> > Signed-off-by: Xudong Chen <xudong.chen@...iatek.com>
> > Signed-off-by: Liguo Zhang <liguo.zhang@...iatek.com>
> > Signed-off-by: Eddie Huang <eddie.huang@...iatek.com>
> > Acked-by: Sascha Hauer <s.hauer@...gutronix.de>
> > ---
> >  drivers/i2c/busses/i2c-mt65xx.c | 94 +++++++++++++++++++++++++++++------------
> >  1 file changed, 67 insertions(+), 27 deletions(-)
> >
> > diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
> > index 7462f05..1ebbf1a 100644
> > --- a/drivers/i2c/busses/i2c-mt65xx.c
> > +++ b/drivers/i2c/busses/i2c-mt65xx.c
> > @@ -33,10 +33,13 @@
> >  #include <linux/sched.h>
> >  #include <linux/slab.h>
> >
> > +#define I2C_RS_TRANSFER                        (1 << 4)
> 
> As far as I can see, mt6589 and mt8127 don't have this bit defined in
> their datasheets (and most probably others neither).
> Is it save to write this bit, although it is not implemented?

I think it is safe to write this bit. Since other guys may have the same
question, I will modify to write I2C_RS_TRANSFER only when this bit
exist.

Eddie


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