linux-kernel - Re: [Patch v2 1/6] soc: qcom: gsbi: Add support for ADM CRCI muxing

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Date:	Fri, 30 Jan 2015 13:37:50 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Kumar Gala <galak@...eaurora.org>,
	Andy Gross <agross@...eaurora.org>
CC:	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	linux-soc@...r.kernel.org
Subject: Re: [Patch v2 1/6] soc: qcom: gsbi: Add support for ADM CRCI muxing

On 01/30/15 08:32, Kumar Gala wrote:
> On Jan 30, 2015, at 12:25 AM, Andy Gross <agross@...eaurora.org> wrote:
>
>> Required properties if child node exists:
>> - #address-cells: Must be 1
>> - #size-cells: Must be 1
>> - ranges: Must be present
>>
>> +Note: Each GSBI should have an alias correctly numbered in "aliases" node.
>> +
>> Properties for children:
>>
>> A GSBI controller node can contain 0 or more child nodes representing serial
>> @@ -37,6 +41,10 @@ Example for APQ8064:
>>
>> #include <dt-bindings/soc/qcom,gsbi.h>
>>
>> +	aliases {
>> +		gsbi4 = <&gsbi4>;
>> +	};
> You appear to be using the alias name to determine a index number for the gsbi, if that is the case, than you should probably just add a cell-index node to the gsbi’s for this purpose.
>

I thought cell-index was "deprecated" and referred more to things like
enumerating all the devices on a bus by assigning them a unique ID.
Aliases, on the other hand, allow us to enumerate a subset of devices
that share the same bus with other devices of different types. For
example, how would I know that a device is gsbi1 vs serial1 if they both
used cell-index and they both had the same parent node?

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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