linux-kernel - Re: [PATCH 1/3] mfd: cros_ec: Add Chrome OS EC userspace device interface

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Message-ID: <546DDAE9.7010602@collabora.co.uk>
Date:	Thu, 20 Nov 2014 13:13:29 +0100
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Lee Jones <lee.jones@...aro.org>
CC:	Doug Anderson <dianders@...omium.org>,
	Bill Richardson <wfrichar@...omium.org>,
	Olof Johansson <olof@...om.net>, Simon Glass <sjg@...gle.com>,
	Gwendal Grignou <gwendal@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] mfd: cros_ec: Add Chrome OS EC userspace device interface

Hello Lee,

On 11/20/2014 12:58 PM, Lee Jones wrote:
>> the printk.h header? to use the pr_* functions but I'll make sure that only
>> the needed headers are included.
> 
> Right, I think don't think you should be using those on a platform device.
>

Yes, I'll use dev_err() instead.
 
>> I prefer macros if possible since they cost nothing and give you an indirection
>> level if you want to change it later. Any reason to not use a define directive?
> 
> Exactly as you said, they add a layer of (pointless)
> indirection/complexity.  You only use this name once, just change it
> where you use it if you wish to (but probably never will) adapt the
> name. 
>

Fair enough, I'll remove it.
 
> 
> I know how the device driver model works.  I'm asking where the
> 'device' is registered from, not the 'driver' i.e. platform data, DT,
> ACPI?
> 

Right, sorry for misunderstanding your question and the silly comment then.

$Subject adds a "cros-ec-dev" mfd cell to the cros ec mfd driver.
So the device is registered from DT when the cros ec device node is
matched (e.g: "google,cros-ec-spi" or "google,cros-ec-i2c") and the
cros ec mfd driver probe function calls mfd_add_devices().

Best regards,
Javier
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