linux-kernel - Re: [PATCH v4 13/14] dt-bindings: cpufreq: Document operating-points-v2-kryo-cpu

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Date:   Tue, 3 Apr 2018 08:11:50 +0530
From:   Sricharan R <sricharan@...eaurora.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Ilia Lin <ilialin@...eaurora.org>
Cc:     mturquette@...libre.com, sboyd@...nel.org, robh@...nel.org,
        mark.rutland@....com, rjw@...ysocki.net, lgirdwood@...il.com,
        broonie@...nel.org, andy.gross@...aro.org, david.brown@...aro.org,
        catalin.marinas@....com, will.deacon@....com,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, rnayak@...eaurora.org,
        amit.kucheria@...aro.org, nicolas.dechesne@...aro.org,
        celster@...eaurora.org, tfinkel@...eaurora.org
Subject: Re: [PATCH v4 13/14] dt-bindings: cpufreq: Document
 operating-points-v2-kryo-cpu

Hi Viresh,

On 4/2/2018 8:37 PM, Sricharan R wrote:
> Hi Viresh,
> 
> On 4/2/2018 3:00 PM, Viresh Kumar wrote:
>> +Sricharan,
>>
>> On 30-03-18, 00:26, Ilia Lin wrote:
>>> In Certain Qualcomm Technologies, Inc. SoCs like apq8096 and msm8996
>>> that have KRYO processors, the CPU ferequencies subset and voltage value
>>> of each OPP varies based on the silicon variant in use.
>>> Qualcomm Technologies, Inc. Process Voltage Scaling Tables
>>> defines the voltage and frequency value based on the msm-id in SMEM
>>> and speedbin blown in the efuse combination.
>>> The qcom-cpufreq-kryo driver reads the msm-id and efuse value from the SoC
>>> to provide the OPP framework with required information.
>>> This is used to determine the voltage and frequency value for each OPP of
>>> operating-points-v2 table when it is parsed by the OPP framework.
>>>
>>> This change adds documentation.
>>>
>>> Change-Id: I1953f652a48249fb516d175f0e965a9510cd4209
>>> Signed-off-by: Ilia Lin <ilialin@...eaurora.org>
>>> ---
>>>  .../devicetree/bindings/cpufreq/kryo-cpufreq.txt   | 693 +++++++++++++++++++++
>>>  1 file changed, 693 insertions(+)
>>>  create mode 100644 Documentation/devicetree/bindings/cpufreq/kryo-cpufreq.txt
>>>
>>> diff --git a/Documentation/devicetree/bindings/cpufreq/kryo-cpufreq.txt b/Documentation/devicetree/bindings/cpufreq/kryo-cpufreq.txt
>>
>> This should really go in opp directory.
>>
>>> new file mode 100644
>>> index 0000000..20cef9d
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/cpufreq/kryo-cpufreq.txt
>>> @@ -0,0 +1,693 @@
>>> +Qualcomm Technologies, Inc. KRYO CPUFreq and OPP bindings
>>> +===================================
>>> +
>>> +In Certain Qualcomm Technologies, Inc. SoCs like apq8096 and msm8996
>>> +that have KRYO processors, the CPU ferequencies subset and voltage value
>>> +of each OPP varies based on the silicon variant in use.
>>> +Qualcomm Technologies, Inc. Process Voltage Scaling Tables
>>> +defines the voltage and frequency value based on the msm-id in SMEM
>>> +and speedbin blown in the efuse combination.
>>> +The qcom-cpufreq-kryo driver reads the msm-id and efuse value from the SoC
>>> +to provide the OPP framework with required information (existing HW bitmap).
>>> +This is used to determine the voltage and frequency value for each OPP of
>>> +operating-points-v2 table when it is parsed by the OPP framework.
>>> +
>>> +Required properties:
>>> +--------------------
>>> +In 'cpus' nodes:
>>> +- operating-points-v2: Phandle to the operating-points-v2 table to use.
>>> +
>>> +In 'operating-points-v2' table:
>>> +- compatible: Should be
>>> +	- 'operating-points-v2-kryo-cpu' for apq8096 and msm8996.
>>> +- nvmem-cells: A phandle pointing to a nvmem-cells node representing the
>>> +		efuse registers that has information about the
>>> +		speedbin that is used to select the right frequency/voltage
>>> +		value pair.
>>> +		Please refer the for nvmem-cells
>>> +		bindings Documentation/devicetree/bindings/nvmem/nvmem.txt
>>> +		and also examples below.
>>
>> Sricharan is also working on adding these, just make sure you guys do the same
>> thing..
>>
 Right, i was adding a similar one for krait cores [1]. There is code common in the
 init sequence across both (little). Do you suggest to make them common ?

Regards,
 Sricharan

 [1] https://patchwork.kernel.org/patch/10261873/

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