linux-kernel - Re: [PATCH v1 3/3] clk: qcom: rcg: update the DFS macro for RCG

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Date:   Mon, 13 May 2019 09:14:46 +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>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 3/3] clk: qcom: rcg: update the DFS macro for RCG

Hello Stephen,

On 5/10/2019 11:24 PM, Stephen Boyd wrote:
> Quoting Taniya Das (2019-05-09 19:58:39)
>> Hello Stephen,
>>
>> Thanks for the review.
>>
>> On 5/9/2019 10:57 PM, Stephen Boyd wrote:
>>> Quoting Taniya Das (2019-05-08 11:24:55)
>>>> Update the init data name for each of the dynamic frequency switch
>>>> controlled clock associated with the RCG clock name, so that it can be
>>>> generated as per the hardware plan. Thus update the macro accordingly.
>>>>
>>>> Signed-off-by: Taniya Das <tdas@...eaurora.org>
>>>
>>> This patch doesn't make any sense to me.
>>>
>>>> ---
>>>>    drivers/clk/qcom/clk-rcg.h    |  2 +-
>>>>    drivers/clk/qcom/gcc-sdm845.c | 96 +++++++++++++++++++++----------------------
>>>>    2 files changed, 49 insertions(+), 49 deletions(-)
>>>>
>>>> diff --git a/drivers/clk/qcom/clk-rcg.h b/drivers/clk/qcom/clk-rcg.h
>>>> index 5562f38..e40e8f8 100644
>>>> --- a/drivers/clk/qcom/clk-rcg.h
>>>> +++ b/drivers/clk/qcom/clk-rcg.h
>>>> @@ -171,7 +171,7 @@ struct clk_rcg_dfs_data {
>>>>    };
>>>>
>>>>    #define DEFINE_RCG_DFS(r) \
>>>> -       { .rcg = &r##_src, .init = &r##_init }
>>>> +       { .rcg = &r, .init = &r##_init }
>>>
>>> Why do we need to rename the init data?
>>>
>>
>> We want to manage the init data as the clock source name, so that we
>> could manage to auto generate our code. So that we do not have to
>> re-name the clock init data manually if the DFS source names gets
>> updated at any point of time.
>>
> 
> Why is the clk name changing to not have a _src after the "root" of the
> clk name? As long as I can remember, RCGs have a "_src" postfix.
> 

Yes, the RCGs would have _src, so we do want the init data also to be
generated with _src postfix. So that we do not have to manually clean up 
the generated code.

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