linux-kernel - Re: [PATCH] clk: qcom: apss-ipq-pll: remove 'config_ctl_hi

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Date: Tue, 14 May 2024 21:38:57 +0530
From: Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>
To: Gabor Juhos <j4g8y7@...il.com>, Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette
	<mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Varadarajan Narayanan
	<quic_varada@...cinc.com>,
        Gokul Sriram Palanisamy
	<quic_gokulsri@...cinc.com>
Subject: Re: [PATCH] clk: qcom: apss-ipq-pll: remove 'config_ctl_hi_val' from
 Stromer pll configs



On 5/14/2024 12:14 AM, Gabor Juhos wrote:
> 2024. 05. 10. 18:25 keltezéssel, Kathiravan Thirumoorthy írta:
>>
>>
>> On 5/10/2024 12:23 AM, Konrad Dybcio wrote:
>>> On 9.05.2024 10:08 AM, Gabor Juhos wrote:
>>>> Since the CONFIG_CTL register is only 32 bits wide in the Stromer
>>>> and Stromer Plus PLLs , the 'config_ctl_hi_val' values from the
>>>> IPQ5018 and IPQ5332 configurations are not used so remove those.
>>>>
>>>> No functional changes.
>>>>
>>>> Signed-off-by: Gabor Juhos <j4g8y7@...il.com>
>>>> ---
>>>
>>> Hm, it sounds suspicious that we'd have these settings then.. Could somebody from
>>> QC please confirm that everything's alright here?
>>
>>
>> I checked the HW doc and yes in both IPQ5018 and IPQ5332 CONFIG_CTL_U register
>> is not implemented. I see offset of CONFIG_CTL_U register is removed in the
>> change[1] by Gabor.
> 
> Thanks for confirming!
> 
>>
>> Given that, should we also drop the pll_has_64bit_config() if block from
>> clk_stromer_pll_configure function?
> 
> If we can be sure, that there will be no Stromer PLLs which implements that
> register we can drop the check. Also, since the SUPPORTS_FSM_MODE flag is not
> set for any of the Stromer (Plus) Plls supported currently, the related check
> can be dropped as well.
> 
> However I would keep that as is for now. I'm planning to remove the
> clk_stromer_pll_configure() function entirely but that needs a bunch of
> preparatory patches which I'm working on at the moment.
> 


It was Stephen's suggestion[1] to introduce the 
clk_stromer_pll_configure() to avoid touching the 
clk_alpha_pll_configure() which has been used by many PLLs. However if 
we have a valid points to remove this API, then yes.

[1] 
https://lore.kernel.org/linux-arm-msm/fd150fa2b35e1e07808e3d1e67e1def7.sboyd@kernel.org/


>>
>> Nevertheless, for this patch
>>
>> Reviewed-by: Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>
> 
> Thank you!
> 
> Regards,
> Gabor