linux-kernel - Re: [PATCH v2 1/2] i2c: add support for Amlogic Meson I2C controller

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Message-ID: <20141110214658.GA15156@gmail.com>
Date:	Mon, 10 Nov 2014 22:46:58 +0100
From:	Beniamino Galvani <b.galvani@...il.com>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	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>,
	Grant Likely <grant.likely@...aro.org>,
	Carlo Caione <carlo@...one.org>, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Jerry Cao <jerry.cao@...ogic.com>,
	Victor Wan <victor.wan@...ogic.com>
Subject: Re: [PATCH v2 1/2] i2c: add support for Amlogic Meson I2C controller

On Mon, Nov 10, 2014 at 03:44:41PM +0100, Wolfram Sang wrote:
> On Sun, Oct 05, 2014 at 10:17:11PM +0200, Beniamino Galvani wrote:
> > This is a driver for the I2C controller found in Amlogic Meson SoCs.
> > 
> > Signed-off-by: Beniamino Galvani <b.galvani@...il.com>
> 
> Thanks. Looking very good already!
> 
> > +static void meson_i2c_prepare_xfer(struct meson_i2c *i2c, bool write)
> 
> Instead of the bool, maybe you could query i2c->state in the function?
> You decide, I am not forcing you to do this.

Seems reasonable, will do.

> 
> > +static u32 meson_i2c_func(struct i2c_adapter *adap)
> > +{
> > +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> > +}
> 
> Have you tested 0-byte transfers, too (i2cdetect -q)? What was your test
> scenario in general?

I did a test with i2cdetect and quick write commands appear to
work.

When I wrote the driver I tested it to communicate with the only I2C
device available on the board, a Ricoh RN5T618 PMIC.

Now I have access to a hardware with a PCF8564 RTC and just realized
that long reads don't work properly, so I'm going to submit a new
version of the patchset in the next days.

Thanks,
Beniamino
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