linux-kernel - Re: [PATCH 4/7] dt-bindings: sdm845-pinctrl: add wakeup interrupt parent for GPIO

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Date:   Mon, 7 Jan 2019 11:51:14 -0700
From:   Lina Iyer <ilina@...eaurora.org>
To:     Rob Herring <robh@...nel.org>
Cc:     sboyd@...nel.org, evgreen@...omium.org, marc.zyngier@....com,
        linux-kernel@...r.kernel.org, rplsssn@...eaurora.org,
        linux-arm-msm@...r.kernel.org, thierry.reding@...il.com,
        bjorn.andersson@...aro.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 4/7] dt-bindings: sdm845-pinctrl: add wakeup interrupt
 parent for GPIO

On Fri, Dec 28 2018 at 17:07 -0700, Rob Herring wrote:
>On Wed, Dec 19, 2018 at 03:11:02PM -0700, Lina Iyer wrote:
>> SDM845 SoC has an always-on interrupt controller (PDC) with select GPIO
>> routed to the PDC as interrupts that can be used to wake the system up
>> from deep low power modes and suspend.
>>
>> Cc: devicetree@...r.kernel.org
>> Signed-off-by: Lina Iyer <ilina@...eaurora.org>
>> ---
>>  .../devicetree/bindings/pinctrl/qcom,sdm845-pinctrl.txt    | 7 ++++++-
>>  1 file changed, 6 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/pinctrl/qcom,sdm845-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/qcom,sdm845-pinctrl.txt
>> index 665aadb5ea28..a522ca46667d 100644
>> --- a/Documentation/devicetree/bindings/pinctrl/qcom,sdm845-pinctrl.txt
>> +++ b/Documentation/devicetree/bindings/pinctrl/qcom,sdm845-pinctrl.txt
>> @@ -29,6 +29,11 @@ SDM845 platform.
>>  	Definition: must be 2. Specifying the pin number and flags, as defined
>>  		    in <dt-bindings/interrupt-controller/irq.h>
>>
>> +- wakeup-parent:
>> +	Usage: optional
>> +	Value type: <phandle>
>> +	Definition: A phandle to the wakeup interrupt controller for the SoC.
>
>Is this really necessary? Is there more than one possible wakeup-parent
>node?
>
No.  There is only one but depending on the architecture, the wakeup
interrupt controller could be different device like PDC on SDM845 or MPM
on SDM820.

What do you have in mind? Let me know if you have a better idea than
referencing in DT.

Thanks,
Lina

>> +
>>  - gpio-controller:
>>  	Usage: required
>>  	Value type: <none>
>> @@ -53,7 +58,6 @@ pin, a group, or a list of pins or groups. This configuration can include the
>>  mux function to select on those pin(s)/group(s), and various pin configuration
>>  parameters, such as pull-up, drive strength, etc.
>>
>> -
>>  PIN CONFIGURATION NODES:
>>
>>  The name of each subnode is not important; all subnodes should be enumerated
>> @@ -160,6 +164,7 @@ Example:
>>  		#gpio-cells = <2>;
>>  		interrupt-controller;
>>  		#interrupt-cells = <2>;
>> +		wakeup-parent = <&pdc>;
>>
>>  		qup9_active: qup9-active {
>>  			mux {
>> --
>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
>> a Linux Foundation Collaborative Project
>>