linux-kernel - Re: [PATCH v7 02/13] dt-bindings: Add SLIMbus bindings

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Date:   Thu, 16 Nov 2017 13:40:13 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Vinod Koul <vinod.koul@...el.com>
Cc:     gregkh@...uxfoundation.org, broonie@...nel.org,
        alsa-devel@...a-project.org, sdharia@...eaurora.org, bp@...e.de,
        poeschel@...onage.de, treding@...dia.com, andreas.noever@...il.com,
        alan@...ux.intel.com, mathieu.poirier@...aro.org, daniel@...ll.ch,
        jkosina@...e.cz, sharon.dvir1@...l.huji.ac.il, joe@...ches.com,
        davem@...emloft.net, james.hogan@...tec.com,
        michael.opdenacker@...e-electrons.com, robh+dt@...nel.org,
        pawel.moll@....com, mark.rutland@....com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, arnd@...db.de
Subject: Re: [PATCH v7 02/13] dt-bindings: Add SLIMbus bindings

Thanks for the review comments.

On 16/11/17 13:09, Vinod Koul wrote:
> On Wed, Nov 15, 2017 at 02:10:32PM +0000, srinivas.kandagatla@...aro.org wrote:
>> From: Sagar Dharia <sdharia@...eaurora.org>
>
>> +
>> +Child nodes:
>> +Every SLIMbus controller node can contain zero or more child nodes
>> +representing slave devices on the bus. Every SLIMbus slave device is
>> +uniquely determined by the enumeration address containing 4 fields:
>> +Manufacturer ID, Product code, Device index, and Instance value for
>> +the device.
>> +If child node is not present and it is instantiated after device
>> +discovery (slave device reporting itself present).
> 
> So you allow the devices to work even if the respective firmware description
> is absent?
Yes, As SLIMbus itself itself is discoverable bus.

> 
>> +
>> +In some cases it may be necessary to describe non-probeable device
>> +details such as non-standard ways of powering up a device. In
>> +such cases, child nodes for those devices will be present as
>> +slaves of the slimbus-controller, as detailed below.
>> +
>> +Required property for SLIMbus child node if it is present:
>> +- reg		- Should be ('Device index', 'Instance ID') from SLIMbus
>> +		  Enumeration  Address.
>> +		  Device Index Uniquely identifies multiple Devices within
>> +		  a single Component.
>> +		  Instance ID Is for the cases where multiple Devices of the
>> +		  same type or Class are attached to the bus.
>> +
>> +- compatible	-"slimMID,PID". The textual representation of Manufacturer ID,
>> +	 	  Product Code, shall be in lower case hexadecimal with leading
>> +		  zeroes suppressed
>> +

>> +		codec: wcd9310@1,0{
>> +			compatible = "slim217,60";
>> +			reg = <1 0>;
>> +		};
>> +	};
> 
> Pardon my ignorance as I am not very familiar with DT nodes, but where are
> the Manufacturer ID, Product code, Device index, and Instance values here?

Manfacturer ID and Product code is part of compatible string
Device index and Instance value are part of reg.

>