linux-kernel - Re: [PATCH v4 6/8] mfd: cros_ec: Support multiple EC in a system

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Date:	Wed, 03 Jun 2015 13:49:03 +0200
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Lee Jones <lee.jones@...aro.org>
CC:	Samuel Ortiz <sameo@...ux.intel.com>,
	Olof Johansson <olof@...om.net>,
	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>,
	Alexandru M Stan <amstan@...omium.org>,
	Heiko Stuebner <heiko@...ech.de>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, Gwendal Grignou <gwendal@...omium.org>
Subject: Re: [PATCH v4 6/8] mfd: cros_ec: Support multiple EC in a system

Hello Lee,

On 06/03/2015 01:27 PM, Lee Jones wrote:
> On Wed, 03 Jun 2015, Javier Martinez Canillas wrote:

[snip]

>> >>  
>> >> -	err = mfd_add_devices(dev, 0, cros_devs,
>> >> -			      ARRAY_SIZE(cros_devs),
>> >> +	if (IS_ENABLED(CONFIG_OF) && dev->of_node)
>> >> +		ec_p.ec_name = of_get_property(dev->of_node, "devname",
>> >> +					       NULL);
>> > 
>> > Has this binding already been accepted?  We don't normally allow
>> > "device name"properties in DT.
>> > 
>> 
>> Sigh, I now noticed that I missed the DT binding change when originally
>> forward porting the patches from the downstream ChromiumOS tree. I'm so
>> sorry about that.
>> 
>> ChromiumOS tree has in Documentation/devicetree/bindings/mfd/cros-ec.txt:
>> 
>> Optional properties (All):
>> - devname: name of the EC. Can be based on its function: for instance,
>>   for Sensor Hub, 'cros_sh', for Power Delivery MCU 'cros_pd'.
>>   If not present, 'cros_ec' can be assumed.
>> 
>> When you say that normally device names are not allowed in DT, do you mean
>> that "devname" is a too generic property name? (which I totally agree) or
>> that DT bindings shouldn't have a property to change a device's name for
>> something more descriptive?
>> 
>> Because for example, the regulator bindings has a "regulator-name" property.
>> If you agree I can change the property to "google,cros-ec-name" which should
>> be more precise.
> 
> I mean, no names of devices are allowed in Device Tree:
> 
>   `git grep name -- arch/arm/boot/dts/ | grep dev`
> 

Ok, but do you agree on having a "google,cros-ec-name" (with no dev on it)
property to define the resource name just like regulators have "regulator-name"
that changes what is shown in /sys/kernel/debug/regulator/$name?

Otherwise all the EC's will be named cros_ec or regardless of their function
and this is shown in both /dev/$name and /sys/class/chromeos/$name.

Best regards,
Javier
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