linux-kernel - Re: [PATCH v2 4/7] dt-bindings: remoteproc: qcom: Add power-domain bindings for Q6V5

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Date:   Tue, 18 Dec 2018 12:00:39 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-soc@...r.kernel.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        tsoni@...eaurora.org, clew@...eaurora.org, akdwived@...eaurora.org,
        Mark Rutland <mark.rutland@....com>,
        linux-remoteproc@...r.kernel.org,
        Evan Green <evgreen@...omium.org>,
        Brian Norris <briannorris@...omium.org>
Subject: Re: [PATCH v2 4/7] dt-bindings: remoteproc: qcom: Add power-domain
 bindings for Q6V5

Hi Doug,
Thanks for the review :)

On 2018-12-18 05:31, Doug Anderson wrote:
> Hi,
> 
> On Mon, Dec 17, 2018 at 2:08 AM Sibi Sankar <sibis@...eaurora.org> 
> wrote:
>> 
>> Add power-domain bindings for Q6V5 MSS on MSM8996 and SDM845 SoCs.
>> 
>> Reviewed-by: Rob Herring <robh@...nel.org>
>> Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
>> ---
>> 
>> v2:
>>   * Add load_state power-domain
>>   * List cx and mx power-domains for MSM8996
>> 
>>  .../devicetree/bindings/remoteproc/qcom,q6v5.txt | 16 
>> ++++++++++++++++
>>  1 file changed, 16 insertions(+)
>> 
>> diff --git 
>> a/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt 
>> b/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt
>> index 98894e6ad456..50695cd86397 100644
>> --- a/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt
>> +++ b/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt
>> @@ -80,6 +80,22 @@ on the Qualcomm Hexagon core.
>>                     reference to the pll-supply regulator to be held 
>> on behalf
>>                     of the booting of the Hexagon core on MSM8996 SoCs
>> 
>> +- power-domains:
>> +       Usage: required
>> +       Value type: <phandle>
>> +       Definition: reference to the list of 2 power-domains for the 
>> modem
>> +                   sub-system on MSM8996 SoCs
> 
> This is truly required for msm8996 SoCs?  The code I'm looking at
> doesn't try to get these power domains for 8996 so presumably you're
> breaking backward compatibility with old device tree files by making
> this required now.  I don't personally know how widespread msm8996
> usage is w/ upstream, so I'd let Bjorn comment on whether he thinks
> this is OK.
> 

This is one of the reasons why the dt node
for mss on 8996 has not been posted/merged upstream.
Hence backward compatibility is not broken yet
in mainline :) .. However it will break on official
linaro integration releases (old dt + new kernel)

> As with the other patches in this series, I personally prefer less
> prose and more lists / tables of exactly what is required for which
> compatible string.
> 
> 
>> +                   reference to the list of 4 power-domains for the 
>> modem
>> +                   sub-system on SDM845 SoCs
>> +
>> +- power-domain-names:
>> +       Usage: required
>> +       Value type: <stringlist>
>> +       Definition: must be "cx", "mx" for the modem sub-system on 
>> MSM8996
>> +                   SoCs
>> +                   must be "cx", "mx", "mss", "load_state" for the 
>> modem
>> +                   sub-system on SDM845 SoCs
> 
> I haven't see a patch for using "load_state".  Can you point at it?  I
> guess this was "aop" in your last version?
> 

using load_state was Bjorn's suggestion and seemed
more appropriate than aop

> 
> -Doug

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