linux-kernel - Re: [PATCH v4 4/6] thermal: tsens: Add support for SDM845

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Date:   Wed, 4 Jul 2018 22:56:26 +0530
From:   Amit Kucheria <amit.kucheria@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Eduardo Valentin <edubezval@...il.com>,
        smohanad@...eaurora.org,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Andy Gross <andy.gross@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        Kees Cook <keescook@...omium.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 4/6] thermal: tsens: Add support for SDM845

On Tue, Jul 3, 2018 at 9:56 PM, Rob Herring <robh@...nel.org> wrote:
> On Mon, Jul 02, 2018 at 06:14:07PM +0530, Amit Kucheria wrote:
>> SDM845 uses v2.4.0 of the TSENS IP block but the get_temp() function
>> appears to be identical across v2.x.y in code seen so far. We use the
>> generic get_temp() function.
>>
>> Signed-off-by: Amit Kucheria <amit.kucheria@...aro.org>
>> ---
>>  Documentation/devicetree/bindings/thermal/qcom-tsens.txt | 2 ++
>>  drivers/thermal/qcom/tsens-v2.c                          | 6 +++++-
>>  drivers/thermal/qcom/tsens.c                             | 6 ++++++
>>  drivers/thermal/qcom/tsens.h                             | 5 ++++-
>>  4 files changed, 17 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/thermal/qcom-tsens.txt b/Documentation/devicetree/bindings/thermal/qcom-tsens.txt
>> index 06195e8..075182e 100644
>> --- a/Documentation/devicetree/bindings/thermal/qcom-tsens.txt
>> +++ b/Documentation/devicetree/bindings/thermal/qcom-tsens.txt
>> @@ -5,6 +5,8 @@ Required properties:
>>   - "qcom,msm8916-tsens" : For 8916 Family of SoCs
>>   - "qcom,msm8974-tsens" : For 8974 Family of SoCs
>>   - "qcom,msm8996-tsens" : For 8996 Family of SoCs
>> + - "qcom,tsens-v2.4.0"  : For SDM845 Family of SoCs
>> + - "qcom,tsens-v2"      : Generic fallback binding for any Soc using 2.x.y version of the tsens IP
>
> You need to show what are valid combinations of compatibles. Does v2
> apply to 8996? One valid combination per line.

I've restructured qcom-tsens.txt to look like this:

-----%<-------

* QCOM SoC Temperature Sensor (TSENS)

Required properties:
- compatible: must be one of the following:
    - "qcom,msm8916-tsens" (MSM8916)
    - "qcom,msm8974-tsens" (MSM8974)
    - "qcom,msm8996-tsens" (MSM8996)
    - "qcom,tsens-<ip_version>", "qcom,tsens-v2" (TSENS IP version and a
       generic v2 property as fallback except for MSM8996)

  Examples with ip_version are:
    - "qcom,tsens-v2.4.0", "qcom,tsens-v2" (SDM845)
    - "qcom,tsens-v2.2.1", "qcom,tsens-v2" (MSM8998)

-----%<-------

8996 would end up being something like this if needed, though we're
stuck with "qcom,msm8996-tsens":
"qcom,msm8996-tsens", "qcom,tsens-v2.1.0", "qcom,tsens-v2" (MSM8996)

If this looks good, I'll respin the patches.

Regards,
Amit