linux-kernel - Re: [PATCH v6 04/11] firmware: xilinx: Add query data API

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Date:   Tue, 15 May 2018 10:34:18 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Jolly Shah <JOLLYS@...inx.com>,
        "ard.biesheuvel@...aro.org" <ard.biesheuvel@...aro.org>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "matt@...eblueprint.co.uk" <matt@...eblueprint.co.uk>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "sboyd@...eaurora.org" <sboyd@...eaurora.org>,
        "michal.simek@...inx.com" <michal.simek@...inx.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        Rajan Vaja <RAJANV@...inx.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v6 04/11] firmware: xilinx: Add query data API



On 14/05/18 20:16, Jolly Shah wrote:
> HI Sudeep,
> 

[...]

>> 
>> Can you give more insight into this ? How will be this used ? How
>> this aligns with data we get from DT ? I am just trying to
>> understand how is this information split between this API and DT
>> for example.
>> 
> 
> This API is used to get clock information from firmware and register
> clocks accordingly in driver. In our case, firmware maintains
> database of all clocks available on chip. DT will provide information
> for off chip reference clocks only. This is to avoid duplication of
> clocks data in DT and firmware both as firmware anyways need clock
> data to manage them.
> 

I wanted to understand the difference with example. What kind of
information you get from DT and what you get from firmware ?

-- 
Regards,
Sudeep