linux-kernel - Re: [PATCH v2 4/9] dt-bindings: power: Add rpm power domain bindings for qcs404

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Date:   Wed, 27 Mar 2019 18:55:28 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     Rajendra Nayak <rnayak@...eaurora.org>
Cc:     bjorn.andersson@...aro.org, robh+dt@...nel.org,
        andy.gross@...aro.org, david.brown@...aro.org,
        mark.rutland@....com, linux-kernel@...r.kernel.org,
        linux-arm-msm-owner@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel-owner@...r.kernel.org
Subject: Re: [PATCH v2 4/9] dt-bindings: power: Add rpm power domain bindings
 for qcs404

On 2019-03-25 09:51, Rajendra Nayak wrote:
> On 3/24/2019 11:20 PM, Sibi Sankar wrote:
>> From: Bjorn Andersson <bjorn.andersson@...aro.org>
>> 
>> Add RPM Power domain bindings for the qcs404 family of SoC
>> 
>> [sibis: Add supported rpmpd states for qcs404]
>> Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
> 
> SoB ordering seems wrong.

will re-order them in v3

> 
>> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
>> ---
>>   .../devicetree/bindings/power/qcom,rpmpd.txt  |  1 +
>>   include/dt-bindings/power/qcom-rpmpd.h        | 22 
>> +++++++++++++++++++
>>   2 files changed, 23 insertions(+)
>> 
>> diff --git a/Documentation/devicetree/bindings/power/qcom,rpmpd.txt 
>> b/Documentation/devicetree/bindings/power/qcom,rpmpd.txt
>> index 980e5413d18f..172ccf940c5c 100644
>> --- a/Documentation/devicetree/bindings/power/qcom,rpmpd.txt
>> +++ b/Documentation/devicetree/bindings/power/qcom,rpmpd.txt
>> @@ -6,6 +6,7 @@ which then translates it into a corresponding voltage 
>> on a rail
>>   Required Properties:
>>    - compatible: Should be one of the following
>>   	* qcom,msm8996-rpmpd: RPM Power domain for the msm8996 family of 
>> SoC
>> +	* qcom,qcs404-rpmpd: RPM Power domain for the qcs404 family of SoC
>>   	* qcom,sdm845-rpmhpd: RPMh Power domain for the sdm845 family of 
>> SoC
>>    - #power-domain-cells: number of cells in Power domain specifier
>>   	must be 1.
>> diff --git a/include/dt-bindings/power/qcom-rpmpd.h 
>> b/include/dt-bindings/power/qcom-rpmpd.h
>> index 87d9c6611682..450378662944 100644
>> --- a/include/dt-bindings/power/qcom-rpmpd.h
>> +++ b/include/dt-bindings/power/qcom-rpmpd.h
>> @@ -36,4 +36,26 @@
>>   #define MSM8996_VDDSSCX		5
>>   #define MSM8996_VDDSSCX_VFC	6
>>   +/* QCS404 Power Domains */
>> +#define QCS404_VDDMX		0
>> +#define QCS404_VDDMX_AO		1
>> +#define QCS404_VDDMX_VFL	2
>> +#define QCS404_LPICX		3
>> +#define QCS404_LPICX_VFL	4
>> +#define QCS404_LPIMX		5
>> +#define QCS404_LPIMX_VFL	6
>> +
>> +/* RPM SMD Power Domain performance levels */
> 
> so unlike in the sdm845 case where we map these levels to
> (contiguous) corners before passing it over to rpm, we seem
> to pass these as-is to rpm, right?
> 
> Does this work if the user passes some value which does not
> really map to a level defined here?
> For instance if value passed is 17 for instance do we fall back to
> 16?

The rpm firmware will ensure that a ceil operation
is performed on any requested level which does not
map to a pre-defined level. I did try to do the
same in kernel however since the opp-levels are not
inserted in ascending order while populating the
opp-table for rpmpd, it becomes difficult to get
ceil/floor levels from the opp-table with minimal
changes.


> 
>> +#define RPM_SMD_LEVEL_RETENTION       16
>> +#define RPM_SMD_LEVEL_RETENTION_PLUS  32
>> +#define RPM_SMD_LEVEL_MIN_SVS         48
>> +#define RPM_SMD_LEVEL_LOW_SVS         64
>> +#define RPM_SMD_LEVEL_SVS             128
>> +#define RPM_SMD_LEVEL_SVS_PLUS        192
>> +#define RPM_SMD_LEVEL_NOM             256
>> +#define RPM_SMD_LEVEL_NOM_PLUS        320
>> +#define RPM_SMD_LEVEL_TURBO           384
>> +#define RPM_SMD_LEVEL_TURBO_NO_CPR    416
>> +#define RPM_SMD_LEVEL_BINNING         512
>> +
>>   #endif
>> 

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