linux-kernel - Re: [PATCH 10/10] mfd: cros_ec: ec_dev->cmd_xfer() returns number of bytes received from EC

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Date:	Tue, 17 Jun 2014 22:07:13 -0700
From:	Simon Glass <sjg@...omium.org>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Lee Jones <lee.jones@...aro.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Olof Johansson <olof@...om.net>,
	Sonny Rao <sonnyrao@...omium.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Bill Richardson <wfrichar@...omium.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Mark Brown <broonie@...nel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Vincent Palatin <vpalatin@...omium.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	lk <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/10] mfd: cros_ec: ec_dev->cmd_xfer() returns number of
 bytes received from EC

Hi Doug,

On 17 June 2014 21:54, Doug Anderson <dianders@...omium.org> wrote:
> Simon,
>
> On Tue, Jun 17, 2014 at 8:46 PM, Simon Glass <sjg@...omium.org> wrote:
>> Hi,
>>
>> On 16 June 2014 14:40, Doug Anderson <dianders@...omium.org> wrote:
>>> From: Bill Richardson <wfrichar@...omium.org>
>>>
>>> When communicating with the EC, the cmd_xfer() function should return the
>>> number of bytes it received from the EC, or negative on error.
>>
>> This is just for the I2C tunnel feature, right? If so, I think this
>> should be mentioned here. It seems to be affecting ec_i2c_xfer(), not
>> cmd_xfer().
>
> No, the tunnel feature is implemented just fine without this (and is
> already landed and working).  It looks like the (not yet upstreamed)
> ec_i2c_limited_xfer for spring returns this new value directly but I'm
> not convinced that's technicall correct.
>
> Bill can correct me if I'm wrong, but I think this is primarily
> interesting once we add in cros_ec_dev (the userspace API) which needs
> this info.  Until that happens this patch doesn't hurt and just
> returns some extra info.

Agreed.

Reviewed-by: Simon Glass <sjg@...omium.org>

Regards,
Simon
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