linux-kernel - Re: [PATCH v1 1/4] clk: qcom: smd: Add XO clock for MSM8998

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Date:   Tue, 5 Feb 2019 15:37:57 -0700
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     Stephen Boyd <sboyd@...nel.org>, bjorn.andersson@...aro.org,
        mturquette@...libre.com
Cc:     marc.w.gonzalez@...e.fr, andy.gross@...aro.org,
        david.brown@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        georgi.djakov@...aro.org
Subject: Re: [PATCH v1 1/4] clk: qcom: smd: Add XO clock for MSM8998

On 2/5/2019 3:32 PM, Stephen Boyd wrote:
> Quoting Jeffrey Hugo (2019-02-05 14:15:16)
>> On 2/5/2019 3:01 PM, Stephen Boyd wrote:
>>> Quoting Jeffrey Hugo (2019-01-30 08:35:44)
>>>> The XO clock generally feeds into other clock controllers as the parent
>>>> for a lot of clock generators.
>>>>
>>>> Fixes: 6131dc81211c (clk: qcom: smd: Add support for MSM8998 rpm clocks)
>>>> Signed-off-by: Jeffrey Hugo <jhugo@...eaurora.org>
>>>
>>> We've historically left out the XO clk because it causes problems where
>>> the XO vote goes away during late init because nobody references it from
>>> the rest of the clk tree and also because RPM defers probe of the system
>>> and then the console blows up when it gets a clk that can't change rate.
>>> See commit 54823af9cd52 ("clk: qcom: Always add factor clock for xo
>>> clocks") for some more info on why we removed all the workarounds and
>>> stuff around here too.
>>>
>>> So are you sure this is OK to do?
>>>    
>>>
>>
>> So, I've got pretty much everything as modules, and I haven't seen any
>> issues.  However let me take a look at the commit you point out and see.
>>
> 
> Is the name of the clk "xo_clk_src"? That isn't the name that we were
> expecting the XO clk from RPM to be called. You might have to look back
> at the history of the rpm clk driver on the list and see when Georgi
> dropped the XO clk from it and if there was anything wrong with that. I
> can't recall if this was discussed on the list or if he just told me in
> some hallway conversation at Connect.
> 

Will do.  Thanks for pointing out the history.

-- 
Jeffrey Hugo
Qualcomm Datacenter Technologies as an affiliate of Qualcomm 
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.