linux-kernel - Re: [PATCH v9 1/4] dt-bindings: clock: Document external clocks for MSM8998 gcc

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Date:   Wed, 13 Nov 2019 08:02:32 -0700
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     Taniya Das <tdas@...eaurora.org>, mturquette@...libre.com,
        sboyd@...nel.org, robh+dt@...nel.org, mark.rutland@....com
Cc:     agross@...nel.org, bjorn.andersson@...aro.org,
        marc.w.gonzalez@...e.fr, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v9 1/4] dt-bindings: clock: Document external clocks for
 MSM8998 gcc

On 11/13/2019 4:20 AM, Taniya Das wrote:
> Hi Jeffrey,
> 
> On 11/13/2019 2:14 AM, Jeffrey Hugo wrote:
>> The global clock controller on MSM8998 can consume a number of external
>> clocks.  Document them.
>>
>> For 7180 and 8150, the hardware always exists, so no clocks are truly
>> optional.  Therefore, simplify the binding by removing the min/max
>> qualifiers to clocks.  Also, fixup an example so that dt_binding_check
>> passes.
>>
>> Signed-off-by: Jeffrey Hugo <jhugo@...eaurora.org>
>> ---
>>   .../devicetree/bindings/clock/qcom,gcc.yaml        | 47 
>> +++++++++++++++-------
>>   1 file changed, 33 insertions(+), 14 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/clock/qcom,gcc.yaml 
>> b/Documentation/devicetree/bindings/clock/qcom,gcc.yaml
>> index e73a56f..2f3512b 100644
>> --- a/Documentation/devicetree/bindings/clock/qcom,gcc.yaml
>> +++ b/Documentation/devicetree/bindings/clock/qcom,gcc.yaml
>> @@ -40,20 +40,38 @@ properties:
>>          - qcom,gcc-sm8150
>>     clocks:
>> -    minItems: 1
>> -    maxItems: 3
>> -    items:
>> -      - description: Board XO source
>> -      - description: Board active XO source
>> -      - description: Sleep clock source
>> +    oneOf:
>> +      #qcom,gcc-sm8150
>> +      #qcom,gcc-sc7180
>> +      - items:
>> +        - description: Board XO source
>> +        - description: Board active XO source
>> +        - description: Sleep clock source
>> +      #qcom,gcc-msm8998
>> +      - items:
>> +        - description: Board XO source
>> +        - description: USB 3.0 phy pipe clock
>> +        - description: UFS phy rx symbol clock for pipe 0
>> +        - description: UFS phy rx symbol clock for pipe 1
>> +        - description: UFS phy tx symbol clock
>> +        - description: PCIE phy pipe clock
> 
> Would it be possible to add an example for MSM8998?

It doesn't seem to be materially different that the existing examples, 
but sure, that's something that can be done.

> 
>>     clock-names:
>> -    minItems: 1
>> -    maxItems: 3
>> -    items:
>> -      - const: bi_tcxo
>> -      - const: bi_tcxo_ao
>> -      - const: sleep_clk
>> +    oneOf:
>> +      #qcom,gcc-sm8150
>> +      #qcom,gcc-sc7180
>> +      - items:
>> +        - const: bi_tcxo
>> +        - const: bi_tcxo_ao
>> +        - const: sleep_clk
> 
> Not required for SC7180.

How are you determining this?

Per the earlier discussion with Stephen, if the hardware exists, it 
should be represented in DT.  According to the documentation I see, the 
sleep clock is routed to the GCC on SC7180.  The driver is not required 
to make use of it.  Thus its required from the DT perspective.

> 
>> +      #qcom,gcc-msm8998
>> +      - items:
>> +        - const: xo
>> +        - const: usb3_pipe
>> +        - const: ufs_rx_symbol0
>> +        - const: ufs_rx_symbol1
>> +        - const: ufs_tx_symbol0
>> +        - const: pcie0_pipe
>>     '#clock-cells':
>>       const: 1
>> @@ -118,6 +136,7 @@ else:
>>         compatible:
>>           contains:
>>             enum:
>> +            - qcom,gcc-msm8998
>>               - qcom,gcc-sm8150
>>               - qcom,gcc-sc7180
>>     then:
>> @@ -179,8 +198,8 @@ examples:
>>       clock-controller@...000 {
>>         compatible = "qcom,gcc-sc7180";
>>         reg = <0x100000 0x1f0000>;
>> -      clocks = <&rpmhcc 0>, <&rpmhcc 1>;
>> -      clock-names = "bi_tcxo", "bi_tcxo_ao";
>> +      clocks = <&rpmhcc 0>, <&rpmhcc 1>, <0>;
>> +      clock-names = "bi_tcxo", "bi_tcxo_ao", "sleep_clk";
> 
> SC7180 does not require a sleep clock.
> 
>>         #clock-cells = <1>;
>>         #reset-cells = <1>;
>>         #power-domain-cells = <1>;
>>
> 


-- 
Jeffrey Hugo
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.