linux-kernel - Re: [PATCH v6 4/4] clk: qcom: add clock controller driver for qca8386/qca8084

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Message-ID: <164945f5-dde9-bfe7-80f4-9ae6736a6259@quicinc.com>
Date:   Sat, 23 Sep 2023 19:26:03 +0800
From:   Jie Luo <quic_luoj@...cinc.com>
To:     Stephen Boyd <sboyd@...nel.org>, <agross@...nel.org>,
        <andersson@...nel.org>, <catalin.marinas@....com>,
        <conor+dt@...nel.org>, <konrad.dybcio@...aro.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <mturquette@...libre.com>,
        <p.zabel@...gutronix.de>, <robh+dt@...nel.org>, <will@...nel.org>
CC:     <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <quic_srichara@...cinc.com>
Subject: Re: [PATCH v6 4/4] clk: qcom: add clock controller driver for
 qca8386/qca8084



On 9/15/2023 12:30 AM, Stephen Boyd wrote:
> Quoting Jie Luo (2023-09-12 20:27:25)
>>
>>
>> On 9/13/2023 1:18 AM, Stephen Boyd wrote:
>>> Quoting Jie Luo (2023-09-12 05:07:02)
>>>>
>>>> and freq_tbl are necessary to this clock.
>>>
>>> I still don't see why the freq_tbl is necessary.
>>
>> Hi Stephen,
>> For clk_rcg2_ops, freq_tbl is used to find the closest rate to decided
>> the parent clock, the configuration of clock source and clock divider
>> are saved in the freq_tbl to configure the RCG hardware register, the
>> mapping of parent clock and hardware register value is decided by the
>> freq_tbl for the RCG clock.
> 
> The divider is always 1. The frequency is the frequency of the parent.
> The two pieces of information are already known without the frequency
> table. Why is it needed?

Hi Stephen,
i uploaded the new patchset V9 to remove these redundant freq_tbl by 
using the clk_ops clk_ops clk_rcg2_mux_closest_ops, thanks for this
suggestion for the code improvement.

Best Regards,
Jie