linux-kernel - Re: [PATCH v6 2/2] arm64: dts: qcom: sa8775p: Add support for clock controllers

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Message-ID: <289e7959-8eae-4598-899c-16c67e66d4e9@quicinc.com>
Date: Tue, 3 Dec 2024 22:41:32 +0530
From: Taniya Das <quic_tdas@...cinc.com>
To: Bjorn Andersson <andersson@...nel.org>
CC: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Michael Turquette
	<mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, <quic_imrashai@...cinc.com>,
        <quic_jkona@...cinc.com>,
        Bartosz Golaszewski
	<bartosz.golaszewski@...aro.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Ajit Pandey <quic_ajipan@...cinc.com>
Subject: Re: [PATCH v6 2/2] arm64: dts: qcom: sa8775p: Add support for clock
 controllers



On 12/3/2024 9:02 PM, Bjorn Andersson wrote:
> On Tue, Dec 03, 2024 at 10:04:13AM +0530, Taniya Das wrote:
>>
>>
>> On 10/26/2024 12:12 AM, Konrad Dybcio wrote:
>>> On 25.10.2024 8:42 PM, Konrad Dybcio wrote:
>>>> On 25.10.2024 10:52 AM, Taniya Das wrote:
>>>>> Add support for video, camera, display0 and display1 clock controllers
>>>>> on SA8775P. The dispcc1 will be enabled based on board requirements.
>>>
>>> Actually, why would that be? CCF should park it gracefully with
>>> unused cleanup
>>>
>>
>> Yes, CCF should take care to cleanup. But I am of an opinion that as we are
>> aware that this platform do not require the dispcc1 so we could avoid the
>> clock driver initialization and help in boot KPI.
>>
> 
> Does that imply that we're guaranteed that the bootloader will never
> configure any clocks in dispcc1 that needs to be gracefully parked from
> the OS? Is this guaranteed to be the case for all QCS9100 boards?
> 

Yes, bootloader will never use DISPCC1.

> IMHO we should default to correctness, and then make product-specific
> boot time optimizations from that starting point.
> 

As I was sure it will not be used on this board, so I left it disabled.

> Regards,
> Bjorn
> 
>>> Konrad
>>>
>>>>>
>>>>> Reviewed-by: Jagadeesh Kona <quic_jkona@...cinc.com>
>>>>> Signed-off-by: Taniya Das <quic_tdas@...cinc.com>
>>>>> ---
>>>>
>>>> Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
>>>>
>>>> Konrad
>>
>> -- 
>> Thanks & Regards,
>> Taniya Das.

-- 
Thanks & Regards,
Taniya Das.