linux-kernel - Re: [PATCH v5 0/7] platform/chrome: Add user-space dev inferface support

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Date:	Wed, 18 Feb 2015 10:27:15 +0100
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Simon Glass <sjg@...omium.org>
CC:	Olof Johansson <olof@...om.net>, Lee Jones <lee.jones@...aro.org>,
	Doug Anderson <dianders@...omium.org>,
	Bill Richardson <wfrichar@...omium.org>,
	Gwendal Grignou <gwendal@...gle.com>,
	Jonathan Corbet <corbet@....net>,
	Varka Bhadram <varkabhadram@...il.com>,
	Paul Bolle <pebolle@...cali.nl>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	lk <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 0/7] platform/chrome: Add user-space dev inferface
 support

Hello Simon,

On 02/18/2015 03:26 AM, Simon Glass wrote:
> 
> On 16 February 2015 at 01:19, Javier Martinez Canillas
> <javier.martinez@...labora.co.uk> wrote:
>> Hello Olof,
>>
>> On 02/02/2015 12:26 PM, Javier Martinez Canillas wrote:
>>> Hello,
>>>
>>> The mainline ChromeOS Embedded Controller (EC) driver is still missing some
>>> features that are present in the downstream ChromiumOS tree. These are:
>>>
>>>   - Low Pin Count (LPC) interface
>>>   - User-space device interface
>>>   - Access to vboot context stored on a block device
>>>   - Access to vboot context stored on EC's nvram
>>>   - Power Delivery Device
>>>   - Support for multiple EC in a system
>>>
>>> This is a fifth version of a series that adds support for the first two of
>>> the missing features: the EC LPC and EC character device interfaces that
>>> are used by user-space to access the ChromeOS EC. The support patches were
>>> taken from the downstream ChromiumOS 3.14 tree with the fixes and cleanups
>>> squashed to have a minimal patch-set.
>>>
>>
>> Any comments on this series? The last version was posted a couple of weeks
>> ago but the series have been in the list for months. Lee has already acked
>> the mfd changes so you can merge all through your chrome-platform tree if
>> you want.
>>
>> It wold be great if this series get in to have the EC user-space interface
>> supported and to minimize the delta with the Chromemium OS kernel since it
>> still has other features that needs to be upstreamed like multiple EC in a
>> system and access to vboot context stored in block device or EC's nvram.
> 
> Are you sure Olof is the right maintainer for this going to mainline?
>

The downstream ChromiumOS kernel has this stuff in drivers/mfd but Lee was
patient enough to explain to me why it does not fit there. So I think the
best place is drivers/platform/chrome/ which is maintained by Olof.
 
> I do feel for you trying to get all this in and have seen your many
> attempts. It has been in U-Boot for 18 months...I hope you get there
> in the end.
>

Thanks a lot for your empathy. I do hope to get there too since there are
still more features to match what is in the downstream tree but needs to
be based on this series.

> Regards,
> Simon
>

Best regards,
Javier
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