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

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Message-ID: <01889053-bcf2-40cb-86ad-2f2bff56f24b@gmail.com>
Date: Mon, 13 May 2024 20:44:33 +0200
From: Gabor Juhos <j4g8y7@...il.com>
To: Kathiravan Thirumoorthy <quic_kathirav@...cinc.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

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.

> 
> Nevertheless, for this patch
> 
> Reviewed-by: Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>

Thank you!

Regards,
Gabor