linux-kernel - Re: [PATCH v3 1/2] dt-bindings: clock: Introduce QCOM LPASS clock bindings

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Message-ID: <47adf305-f649-dca6-e45e-51c7b418d418@codeaurora.org>
Date:   Wed, 5 Sep 2018 23:56:36 +0530
From:   Taniya Das <tdas@...eaurora.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Amit Nischal <anischal@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        robh@...nel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: clock: Introduce QCOM LPASS clock
 bindings

Hello Stephen,

Thanks for the review comments.

On 8/28/2018 2:44 AM, Stephen Boyd wrote:
> Quoting Taniya Das (2018-08-03 05:21:13)
>> Add device tree bindings for Low Power Audio subsystem clock controller for
>> Qualcomm Technology Inc's SDM845 SoCs.
>>
>> Signed-off-by: Taniya Das <tdas@...eaurora.org>
>> ---
>>   .../devicetree/bindings/clock/qcom,gcc.txt         |  2 ++
>>   .../devicetree/bindings/clock/qcom,lpasscc.txt     | 33 ++++++++++++++++++++++
>>   include/dt-bindings/clock/qcom,gcc-sdm845.h        |  2 ++
>>   include/dt-bindings/clock/qcom,lpass-sdm845.h      | 16 +++++++++++
>>   4 files changed, 53 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/clock/qcom,lpasscc.txt
>>   create mode 100644 include/dt-bindings/clock/qcom,lpass-sdm845.h
>>
>> diff --git a/Documentation/devicetree/bindings/clock/qcom,gcc.txt b/Documentation/devicetree/bindings/clock/qcom,gcc.txt
>> index 664ea1f..e452abc 100644
>> --- a/Documentation/devicetree/bindings/clock/qcom,gcc.txt
>> +++ b/Documentation/devicetree/bindings/clock/qcom,gcc.txt
>> @@ -32,6 +32,8 @@ be part of GCC and hence the TSENS properties can also be
>>   part of the GCC/clock-controller node.
>>   For more details on the TSENS properties please refer
>>   Documentation/devicetree/bindings/thermal/qcom-tsens.txt
>> +- qcom,lpass-protected : Indicate GCC to be able to access the
>> +                       lpass gcc clock branches.
> 
> This doesn't parse well for me. Maybe something like:
> 
> 'Indicate that the LPASS clock branches within GCC are unusable due to
> firmware access control restrictions'?
> 

Sure, will update in the next series.

>>
>>   Example:
>>          clock-controller@...000 {
>> diff --git a/Documentation/devicetree/bindings/clock/qcom,lpasscc.txt b/Documentation/devicetree/bindings/clock/qcom,lpasscc.txt
>> new file mode 100644
>> index 0000000..062e413
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/clock/qcom,lpasscc.txt
>> @@ -0,0 +1,33 @@
>> +Qualcomm LPASS Clock Controller Binding
>> +-----------------------------------------------
>> +
>> +Required properties :
>> +- compatible           : shall contain "qcom,sdm845-lpasscc"
>> +- #clock-cells         : from common clock binding, shall contain 1.
>> +- reg                  : shall contain base register address and size,
>> +                         in the order
>> +                       Index-0 maps to LPASS_CC register region
>> +                       Index-1 maps to LPASS_QDSP6SS register region
>> +- qcom,lpass-protected : Boolean property to indicate to GCC clock controller
>> +                        for the lpass GCC clocks.
> 
> Why is this here?
> 

Yes, I kept it to make sure it is marked in GCC clock driver too. May be 
should remove it.

>> +
>> +Optional properties :
>> +- reg-names    : register names of LPASS domain
>> +                "lpass_cc", "lpass_qdsp6ss".
>> +
>> +Example:
>> +
>> +The below node has to be defined in the cases where the LPASS peripheral loader
>> +would bring the subsystem out of reset.
>> +
>> +       lpasscc: clock-controller {
>> +               compatible = "qcom,sdm845-lpasscc";
>> +               reg = <0x17014000 0x1f004>, <0x17300000 0x200>;
>> +               reg-names = "lpass_cc", "lpass_qdsp6ss";
>> +               #clock-cells = <1>;
>> +       };
>> +
>> +       gcc: clock-controller@...000 {
>> +               compatible = "qcom,gcc-sdm845";
>> +               qcom,lpass-protected;
>> +       };

-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation.

--