linux-kernel - Re: [RESEND PATCH 0/8] cros_ec: Add multiple EC and protocol v3 support

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Date:	Thu, 16 Apr 2015 11:49:58 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
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

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>


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.


Heiko
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