linux-kernel - Re: [PATCH v7 5/7] dt: thermal: tsens: Document the fallback DT property for v2 of TSENS IP

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Date:   Tue, 17 Jul 2018 17:09:18 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Amit Kucheria <amit.kucheria@...aro.org>
Cc:     linux-kernel@...r.kernel.org, rnayak@...eaurora.org,
        linux-arm-msm@...r.kernel.org, bjorn.andersson@...aro.org,
        edubezval@...il.com, smohanad@...eaurora.org,
        vivek.gautam@...eaurora.org, andy.gross@...aro.org,
        dianders@...omium.org, Zhang Rui <rui.zhang@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v7 5/7] dt: thermal: tsens: Document the fallback DT
 property for v2 of TSENS IP

On Thu, Jul 12, 2018 at 02:09:06PM +0530, Amit Kucheria wrote:
> We want to create common code for v2 of the TSENS IP block that is used in
> a large number of Qualcomm SoCs. "qcom,tsens-v2" should be able to handle
> most of the common functionality start with a common get_temp() function.
> 
> It is also necessary to split out the memory regions for the TM and SROT
> register banks because their offsets are not constant across SoC families.
> 
> Signed-off-by: Amit Kucheria <amit.kucheria@...aro.org>
> Reviewed-by: Rob Herring <robh@...nel.org>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> Tested-by: Matthias Kaehlcke <mka@...omium.org>
> ---
>  .../devicetree/bindings/thermal/qcom-tsens.txt     | 31 +++++++++++++++++-----
>  1 file changed, 25 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/thermal/qcom-tsens.txt b/Documentation/devicetree/bindings/thermal/qcom-tsens.txt
> index 06195e8..b5312a8 100644
> --- a/Documentation/devicetree/bindings/thermal/qcom-tsens.txt
> +++ b/Documentation/devicetree/bindings/thermal/qcom-tsens.txt
> @@ -1,18 +1,28 @@
>  * QCOM SoC Temperature Sensor (TSENS)
>  
>  Required properties:
> -- compatible :
> - - "qcom,msm8916-tsens" : For 8916 Family of SoCs
> - - "qcom,msm8974-tsens" : For 8974 Family of SoCs
> - - "qcom,msm8996-tsens" : For 8996 Family of SoCs
> +- compatible:
> +  Must be one of the following:
> +    - "qcom,msm8916-tsens" (MSM8916)
> +    - "qcom,msm8974-tsens" (MSM8974)
> +    - "qcom,msm8996-tsens" (MSM8996)
> +    - "qcom,msm8998-tsens", "qcom,tsens-v2" (MSM8998)
> +    - "qcom,sdm845-tsens", "qcom,tsens-v2" (SDM845)
> +  The generic "qcom,tsens-v2" property must be used as a fallback for any SoC
> +  with version 2 of the TSENS IP. MSM8996 is the only exception beacause the

s/beacause/because/

> +  generic property did not exist when support was added.
> +
> +- reg: Address range of the thermal registers.
> +  New platforms containing v2.x.y of the TSENS IP must specify the SROT and TM
> +  register spaces separately, with order being TM before SROT.
> +  See Example 2, below.
>  
> -- reg: Address range of the thermal registers
>  - #thermal-sensor-cells : Should be 1. See ./thermal.txt for a description.
>  - #qcom,sensors: Number of sensors in tsens block
>  - Refer to Documentation/devicetree/bindings/nvmem/nvmem.txt to know how to specify
>  nvmem cells
>  
> -Example:
> +Example 1 (legacy support before a fallback tsens-v2 propoerty was introduced):

s/propoerty/property/

>  tsens: thermal-sensor@...000 {
>  		compatible = "qcom,msm8916-tsens";
>  		reg = <0x4a8000 0x2000>;
> @@ -20,3 +30,12 @@ tsens: thermal-sensor@...000 {
>  		nvmem-cell-names = "caldata", "calsel";
>  		#thermal-sensor-cells = <1>;
>  	};
> +
> +Example 2 (for any platform containing v2 of the TSENS IP):
> +tsens0: thermal-sensor@...3000 {
> +		compatible = "qcom,sdm845-tsens", "qcom,tsens-v2";
> +		reg = <0xc263000 0x1ff>, /* TM */
> +			<0xc222000 0x1ff>; /* SROT */
> +		#qcom,sensors = <13>;
> +		#thermal-sensor-cells = <1>;
> +	};

Besides the typos:

Reviewed-by: Matthias Kaehlcke <mka@...omium.org>

Oh, and you also might want to reorder the patches as suggested by
Doug on v6 to put the changes in the binding before the code changes.