linux-kernel - Re: [PATCH 2/2] arm64: dts: sc7180: Add minimal dts/dtsi files for SC7180 soc

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Date:   Wed, 16 Oct 2019 16:13:01 +0530
From:   Taniya Das <tdas@...eaurora.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Rajendra Nayak <rnayak@...eaurora.org>, agross@...nel.org,
        robh+dt@...nel.org, bjorn.andersson@...aro.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: sc7180: Add minimal dts/dtsi files for
 SC7180 soc


>>>> +		xo_board: xo-board {
>>>> +			compatible = "fixed-clock";
>>>> +			clock-frequency = <38400000>;
>>>> +			clock-output-names = "xo_board";
>>>> +			#clock-cells = <0>;
>>>> +		};
>>>> +
>>>> +		sleep_clk: sleep-clk {
>>>> +			compatible = "fixed-clock";
>>>> +			clock-frequency = <32764>;
>>>> +			clock-output-names = "sleep_clk";
>>>> +			#clock-cells = <0>;
>>>> +		};
>>>> +
>>>> +		bi_tcxo: bi_tcxo {
>>>
>>> why is this a clock defined here? Isnt this gcc clock?
>>
>> This is a RPMH-controlled clock and not from GCC. It is the parent clock for
>> GCC RCGs/PLLs.
> 
> Yes right!
> 
>> Once the RPMH clock support is added these would be removed.
> 
> Wont it make sense to keep this bit not upstream and then remove that
> part when you have rpmh support available. Reduces the churn upstream!
> 
> The parent can be xo_board till then!
> 

The xo_board is 38.4MHz and bi_tcxo (xo/2), which needs to be updated 
anyways :).

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