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

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Message-ID: <CAD=FV=W0L_D2GkeRb0+JLZAMk=2m2V3hOS4fFbXDtQHNoYxZvA@mail.gmail.com>
Date:	Tue, 17 Jun 2014 21:54:03 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Simon Glass <sjg@...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

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.

-Doug
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