From mboxrd@z Thu Jan 1 00:00:00 1970 From: eddie.huang@mediatek.com (Eddie Huang) Date: Wed, 20 May 2015 10:53:22 +0800 Subject: [PATCH v8 3/3] I2C: mediatek: Add driver for MediaTek MT8173 I2C controller In-Reply-To: References: <1431967209-5261-1-git-send-email-eddie.huang@mediatek.com> <1431967209-5261-4-git-send-email-eddie.huang@mediatek.com> Message-ID: <1432090402.13819.14.camel@mtksdaap41> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi Matthias, On Tue, 2015-05-19 at 16:45 +0200, Matthias Brugger wrote: > 2015-05-18 18:40 GMT+02:00 Eddie Huang : > > 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 > > Signed-off-by: Liguo Zhang > > Signed-off-by: Eddie Huang > > Acked-by: Sascha Hauer > > --- > > 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 > > #include > > > > +#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