linux-kernel - Re: [PATCH v4 1/2] dt-bindings: cpufreq: Introduce QCOM CPUFREQ FW bindings

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Date:   Fri, 15 Jun 2018 18:42:48 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Taniya Das <tdas@...eaurora.org>, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Cc:     Sudeep Holla <sudeep.holla@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        devicetree@...r.kernel.org, robh@...nel.org, skannan@...eaurora.org
Subject: Re: [PATCH v4 1/2] dt-bindings: cpufreq: Introduce QCOM CPUFREQ FW
 bindings



On 15/06/18 18:31, Taniya Das wrote:
> 
> 
> On 6/15/2018 6:53 PM, Sudeep Holla wrote:
>>

[...]

>>>
>>>> It should be easily extensible is what I am
>>>> trying to say. You can add more info and alter the information in the
>>>> driver with compatibles if you keep the register info as minimum as
>>>> possible. For now, you have enable, set and lut registers. What if you
>>>> want to provide power numbers ?
>>>>
>>>
>>> Yes I do understand the intent of mapping the whole register space, but
>>> as per the HW specs these 3 registers would be the only ones required
>>> for now. I do not think this hardware engine has any information on the
>>> power numbers.
>>>
>>
>> That's fine. So on this platform DT, will you list only the registers
>> touched by the OS for all the IP ? I am sure that will not be the case.
>>
> 
> Yes, registers list those would be touched by OS only.
> 

You are still missing the point.
Look at other IP blocks like pinmux/gpio/...(choose your pick).

E.g. Lets say gpio controller driver touches only status set and get
registers in a port, will you list then individually in the DT for 'n'
ports on the platform ?

-- 
Regards,
Sudeep