linux-kernel - Re: [PATCH v5 15/15] devicetree: bindings: Document qcom,pvs

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Date:   Thu, 21 Dec 2017 17:23:01 +0530
From:   Sricharan R <sricharan@...eaurora.org>
To:     Rob Herring <robh@...nel.org>
Cc:     mark.rutland@....com, rjw@...ysocki.net,
        devicetree@...r.kernel.org, Viresh Kumar <viresh.kumar@...aro.org>,
        mturquette@...libre.com, linux-pm@...r.kernel.org,
        sboyd@...eaurora.org, linux@...linux.org.uk,
        linux-kernel@...r.kernel.org, david.brown@...aro.org,
        linux-arm-msm@...r.kernel.org, andy.gross@...aro.org,
        linux-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 15/15] devicetree: bindings: Document qcom,pvs

Hi Rob,

On 12/21/2017 2:48 AM, Rob Herring wrote:
> On Wed, Dec 20, 2017 at 11:55:33AM +0530, Sricharan R wrote:
>> Hi Viresh,
>>
>> On 12/20/2017 8:56 AM, Viresh Kumar wrote:
>>> On 19-12-17, 21:25, Sricharan R wrote:
>>>> +	cpu@0 {
>>>> +		compatible = "qcom,krait";
>>>> +		enable-method = "qcom,kpss-acc-v1";
>>>> +		device_type = "cpu";
>>>> +		reg = <0>;
>>>> +		qcom,acc = <&acc0>;
>>>> +		qcom,saw = <&saw0>;
>>>> +		clocks = <&kraitcc 0>;
>>>> +		clock-names = "cpu";
>>>> +		cpu-supply = <&smb208_s2a>;
>>>> +		operating-points-v2 = <&cpu_opp_table>;
>>>> +	};
>>>> +
>>>> +	qcom,pvs {
>>>> +		qcom,pvs-format-a;
>>>> +	};
>>>
>>> Not sure what Rob is going to say on that :)
>>>
>>
>>  Yes. Would be good to know the best way.
> 
> Seems like this should be a property of an efuse node either implied by 
> the compatible or a separate property. What determines format A vs. B?
> 

 Yes, this efuse registers are part of the eeprom (qfprom) tied to the soc.
 So this property (details like bitfields and register offsets that it represents)
 can be put soc specific and nvmem apis can be used to read
 the registers. Does something like below look ok ?

 qcom,pvs {
	compatible = "qcom,pvs-ipq8064";
	nvmem-cells = <&pvs_efuse>;
 }

 qfprom: qfprom@...000 {
 	compatible      = "qcom,qfprom";
 	reg             = <0x00700000 0x1000>;
 	#address-cells  = <1>;
 	#size-cells     = <1>;
 	ranges;
 	pvs_efuse: pvs {
 	reg = <0xc0 0x8>;
 	};
 };


Regards,
 Sricharan
 
 

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