linux-kernel - Re: [PATCH] i2c: axxia: Add I2C driver for AXM55xx

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Date:	Mon, 22 Sep 2014 12:47:59 +0200
From:	Anders Berg <anders.berg@...gotech.com>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	devicetree <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-i2c@...r.kernel.org
Subject: Re: [PATCH] i2c: axxia: Add I2C driver for AXM55xx

On Mon, Sep 22, 2014 at 11:59 AM, Wolfram Sang <wsa@...-dreams.de> wrote:
>> >> +static int
>> >> +axxia_i2c_xfer_msg(struct axxia_i2c_dev *idev, struct i2c_msg *msg)
>> >> +{
>> >> +     u32 int_mask = MST_STATUS_ERR | MST_STATUS_SNS;
>> >> +     u32 rx_xfer, tx_xfer;
>> >> +     u32 addr_1, addr_2;
>> >> +     int ret;
>> >> +
>> >> +     if (msg->len == 0 || msg->len > 255)
>> >> +             return -EINVAL;
>> >
>> > Ouch, really? Maybe we should warn the user here.
>>
>> Yeah, the transfer length register limits the length to 255. I'll add
>> a warning here.
>
> Please also add this information to the Kconfig description and
> somewhere at the top of the source file. This is an important flaw which
> people should easily find out about.
>

You are referring to the "len <= 255" restriction being the flaw here,
right? I'll add a note to Kconfig and the driver about that.

The other part of the condition (msg->len == 0) should actually go
away. The controller can do zero-length-data transfers. I'll fix that
for next round.

/Anders
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