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Date: Tue, 18 Dec 2018 11:22:44 +0530
From: Sibi Sankar <sibis@codeaurora.org>
Subject: Re: [PATCH v2 2/7] dt-bindings: remoteproc: qcom: Add clock bindings
 for Q6V5
In-Reply-To: <CAD=FV=Ui6ys4R3nenix3USeRPAd_vVdrArXxdf-iEc=4QRhE+A@mail.gmail.com>
References: <20181217100724.4593-1-sibis@codeaurora.org>
 <20181217100724.4593-2-sibis@codeaurora.org>
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Message-ID: <8decd38d8e28c6657949f3c140947977@codeaurora.org>
To: Doug Anderson <dianders@chromium.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>, Rob Herring <robh+dt@kernel.org>, Andy Gross <andy.gross@linaro.org>, David Brown <david.brown@linaro.org>, linux-arm-msm <linux-arm-msm@vger.kernel.org>, "open list:ARM/QUALCOMM SUPPORT" <linux-soc@vger.kernel.org>, devicetree@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>, tsoni@codeaurora.org, clew@codeaurora.org, akdwived@codeaurora.org, Mark Rutland <mark.rutland@arm.com>, linux-remoteproc@vger.kernel.org, Evan Green <evgreen@chromium.org>, Brian Norris <briannorris@chromium.org>
List-ID: <linux-remoteproc@vger.kernel.org>

Hi Doug,
Thanks for the review :)

On 2018-12-18 05:29, Doug Anderson wrote:
> Hi,
> 
> On Mon, Dec 17, 2018 at 2:07 AM Sibi Sankar <sibis@codeaurora.org> 
> wrote:
>> 
>> Add missing clock bindings for Q6V5 MSS on SDM845 SoCs.
>> 
>> Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
>> ---
>>  .../devicetree/bindings/remoteproc/qcom,q6v5.txt       | 10 
>> +++++++---
>>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> Fixes: 9f058fa2efb1 ("remoteproc: qcom: Add support for mss remoteproc
> on msm8996")
> Fixes: fb22022ff63d ("dt-bindings: remoteproc: Add Q6v5 Modem PIL
> binding for SDM845")
> 
> ...it probably doesn't matter too much but if we wanted to be really
> careful we could split into two patches, one for the msm8996 and one
> for sdm845.  I don't think people care that much about stable
> backports of bindings though (someone can feel free to correct me)...
> 

I did think of splitting this up but it doesn't
actually fix 9f058fa2efb1 yet. I noticed a few missing
clocks for mss on 8996 when I did a diff with the
corresponding CAF tree. Hence couldn't add bindings for
it. Will add them once I validate mss on 8996 with the
necessary changes.

> 
>> diff --git 
>> a/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt 
>> b/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt
>> index 9ff5b0309417..780adc043b37 100644
>> --- a/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt
>> +++ b/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt
>> @@ -39,13 +39,17 @@ on the Qualcomm Hexagon core.
>>  - clocks:
>>         Usage: required
>>         Value type: <phandle>
>> -       Definition: reference to the iface, bus and mem clocks to be 
>> held on
>> -                   behalf of the booting of the Hexagon core
>> +       Definition: reference to the list of 4 clocks for the modem 
>> sub-system
>> +                   reference to the list of 8 clocks for the modem 
>> sub-system
>> +                   on SDM845 SoCs
> 
> The above is confusing because you don't list the SoCs that are
> supposed to use the 4 clocks.  How about instead:
> 
> Definition: reference to the clocks that match clock-names
> 

AFAIK, only the exceptions are captured. I am fine
with both, I'll wait for Bjorn/Rob's preference.

> 
>>  - clock-names:
>>         Usage: required
>>         Value type: <stringlist>
>> -       Definition: must be "iface", "bus", "mem"
>> +       Definition: must be "iface", "bus", "mem", "xo" for the modem 
>> sub-system
>> +                   must be "iface", "bus", "mem", "gpll0_mss", 
>> "snoc_axi",
>> +                   "mnoc_axi", "prng", "xo" for the modem sub-system 
>> on SDM845
>> +                   SoCs
> 
> Same here where it's confusing.  ...but also, it it correct?  As far
> as I can tell you're missing msm8996.  It's better to just be explicit
> and list each one, ideally without all the prose.
> 
> Definition: The clocks needed depend on the compatible string:
> 

ditto

> qcom,sdm845-mss-pil: "xo", "prng", "iface", "snoc_axi", "bus", "mem",
> "gpll0_mss", "mnoc_axi"
> qcom,msm8996-mss-pil: "xo", "pnoc", "iface", "bus", "mem", 
> "gpll0_mss_clk"

ditto

> qcom,msm8974-mss-pil: "xo", "iface", "bus", "mem"
> qcom,msm8916-mss-pil: "xo", "iface", "bus", "mem"
> qcom,q6v5-pil: "xo", "iface", "bus", "mem"
> 
> ...as far as I can tell this binding is supposed to account for
> "qcom,ipq8074-wcss-pil" too but it seems that one doesn't have
> clock-names.
> 

Yeah the lack of clocks have to be documented
for ipq8074-wcss-pil.. will do it in v3

> 
> -Doug

-- 
-- Sibi Sankar --
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project.