linux-kernel - Re: [PATCH v2 3/8] dt-bindings: clock: Add YAML schemas for the QCOM GPUCC clock bindings

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Message-ID: <1acbd025-d4f4-02b3-2c61-8672405894cc@codeaurora.org>
Date:   Fri, 27 Dec 2019 12:13:15 +0530
From:   Taniya Das <tdas@...eaurora.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>
Cc:     Michael Turquette <mturquette@...libre.com>,
        David Brown <david.brown@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        MSM <linux-arm-msm@...r.kernel.org>, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>, Rob Herring <robh@...nel.org>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v2 3/8] dt-bindings: clock: Add YAML schemas for the QCOM
 GPUCC clock bindings

Hello Stephen,

On 12/19/2019 11:02 AM, Stephen Boyd wrote:
> Quoting Taniya Das (2019-11-26 20:06:49)
>>
>>
>> On 11/26/2019 11:41 PM, Stephen Boyd wrote:
>>> Quoting Jeffrey Hugo (2019-11-15 07:11:01)
>>>> On Fri, Nov 15, 2019 at 3:07 AM Taniya Das <tdas@...eaurora.org> wrote:
>>>>> diff --git a/Documentation/devicetree/bindings/clock/qcom,gpucc.yaml b/Documentation/devicetree/bindings/clock/qcom,gpucc.yaml
>>>>> new file mode 100644
>>>>> index 0000000..c2d6243
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/clock/qcom,gpucc.yaml
>>>>> +      - description: GPLL0 source from GCC
>>>>
>>>> This is not an accurate conversion.  GPLL0 was not valid for 845, and
>>>> is required for 8998.
>>>
>>> Thanks for checking Jeff.
>>>
>>> It looks like on 845 there are two gpll0 clocks going to gpucc. From
>>> gpu_cc_parent_map_0:
>>>
>>>        "gcc_gpu_gpll0_clk_src",
>>>        "gcc_gpu_gpll0_div_clk_src",
>>>
>>
>> There are branches of GPLL0 which would be connected to most external
>> CCs. It is upto to the external CCs to either use them to source a
>> frequency or not.
> 
> Yes, they can decide to use them or not, but they really do go to the
> CCs so the DT should describe that.
> 

Documentation is updated with both the GPLL0 branches now.

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