Message-ID: <552F8DCE.6080601@collabora.co.uk>
Date:	Thu, 16 Apr 2015 12:24:14 +0200
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Heiko Stübner <heiko@...ech.de>
CC:	Olof Johansson <olof@...om.net>, Lee Jones <lee.jones@...aro.org>,
	Doug Anderson <dianders@...omium.org>,
	Bill Richardson <wfrichar@...omium.org>,
	Simon Glass <sjg@...gle.com>,
	Gwendal Grignou <gwendal@...gle.com>,
	Stephen Barber <smbarber@...omium.org>,
	Filipe Brandenburger <filbranden@...gle.com>,
	Todd Broch <tbroch@...omium.org>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH 0/8] cros_ec: Add multiple EC and protocol v3 support

Hello Heiko,

On 04/16/2015 11:49 AM, Heiko Stübner wrote:
> Hi Javier,
> 
> Am Donnerstag, 16. April 2015, 09:29:59 schrieb Javier Martinez Canillas:
>> Hello,
>> 
>> On 04/06/2015 06:14 PM, Javier Martinez Canillas wrote:
>> > Newer Chromebooks have more than one Embedded Controller (EC) in the
>> > system. These additional ECs are connected through I2C with a host EC
>> > which is the one that is connected to the Application Processor (AP)
>> > through I2C, SPI or LPC.
>> > 
>> > So on these platforms, sub-processors are chained to each other:
>> > 
>> > AP <--> Host EC <--> Power Delivery (PD) EC
>> > 
>> > The AP sends commands to the additional EC through the host EC using
>> > a set of passthru commands and the host redirects to the correct EC.
>> > 
>> > This series adds support for multiple EC in a system and also for the
>> > protocol version 3 that is used on newer ECs.
>> 
>> Any comments about this series? I know that we are in the middle of the
>> merge window but it would be great if I can get some feedback to get it
>> ready and re-post for 4.2 (addressing any issue) once 4.1-rc1 is out.
>> 
>> > Most patches were taken from the downstream ChromiumOS v3.14 tree with
>> > fixes squashed, split to minimise the cross subsystem churn and changes
>> > for mainline inclusion but were not modified functionality wise.
>> > 
>> > The series depend on "platform/chrome: Add user-space dev inferface
>> > support" [0] that is already merged in the chrome-platform tree so
>> > probably these patches should also go through that tree once the mfd
>> > patches are acked.
>> > 
>> > The series is a resend of a patch-set posted a month ago [1]. The only big
>> 
>> As I said, the original patchset was post about a month ago and this re-sent
>> 10 days ago so it would be great to have some feedback on the series.
> 
> on a veyron-pinky-rev2, with
> cros-ec-spi spi0.0: using proto v3
> cros-ec-spi spi0.0: no PD chip found: -19
> 
> Tested-by: Heiko Stuebner <heiko@...ech.de>
> 

Thanks a lot for testing!

> 
> with the catch of the device needing two additional patches from the Chromeos-
> tree:
> 
> c7ae1e2ef996 mfd: cros ec: spi: put the delay and send msg in one cycle
> 8558460450c1 mfd: cros ec: spi: Add delay for asserting CS
> 
> and I'm not sure if they are submitted yet.

Yes, those patches have not been posted yet. The delta for the cros_ec
drivers between the ChromiumOS tree and mainline is still very big but
I've been trying to reduce it with each series.

I was planning to include those in the next series once this one lands.
You can refer to http://crbug.com/391797 for the current status.

> 
> 
> Heiko
> 

Best regards,
Javier
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