linux-kernel - Re: [PATCH 1/4] dt-bindings: thermal: tsens: Add ipq9574 compatible

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Message-ID: <20230504045757.GA13434@varda-linux.qualcomm.com>
Date:   Thu, 4 May 2023 10:27:58 +0530
From:   Varadarajan Narayanan <quic_varada@...cinc.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC:     <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <amitk@...nel.org>,
        <thara.gopinath@...il.com>, <rafael@...nel.org>,
        <daniel.lezcano@...aro.org>, <rui.zhang@...el.com>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Praveenkumar I <quic_ipkumar@...cinc.com>
Subject: Re: [PATCH 1/4] dt-bindings: thermal: tsens: Add ipq9574 compatible

On Wed, May 03, 2023 at 09:42:28AM +0200, Krzysztof Kozlowski wrote:
> On 03/05/2023 09:10, Varadarajan Narayanan wrote:
> > On Mon, May 01, 2023 at 09:08:49AM +0200, Krzysztof Kozlowski wrote:
> >> On 28/04/2023 16:52, Varadarajan Narayanan wrote:
> >>> From: Praveenkumar I <quic_ipkumar@...cinc.com>
> >>>
> >>> Qualcomm IPQ9574 has tsens v2.3.1 block, which is similar to IPQ8074 tsens.
> >>>
> >>> Signed-off-by: Praveenkumar I <quic_ipkumar@...cinc.com>
> >>> Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>
> >>> ---
> >>>  Documentation/devicetree/bindings/thermal/qcom-tsens.yaml | 3 +++
> >>>  1 file changed, 3 insertions(+)
> >>>
> >>> diff --git a/Documentation/devicetree/bindings/thermal/qcom-tsens.yaml b/Documentation/devicetree/bindings/thermal/qcom-tsens.yaml
> >>> index d1ec963..8e2208c 100644
> >>> --- a/Documentation/devicetree/bindings/thermal/qcom-tsens.yaml
> >>> +++ b/Documentation/devicetree/bindings/thermal/qcom-tsens.yaml
> >>> @@ -66,6 +66,7 @@ properties:
> >>>        - description: v2 of TSENS with combined interrupt
> >>>          enum:
> >>>            - qcom,ipq8074-tsens
> >>> +          - qcom,ipq9574-tsens
> >>
> >> Your drive change indicates they are compatible, so make them
> >> compatible. 9574 followed by 8074.
> >
> > Not able to understand. You want IPQ9574 to use "qcom,ipq8074-tsens"
> > instead of adding a "qcom,ipq9574-tsens" and no need to add an extra
> > entry to the driver like
>
> Assuming the devices are really compatible, which your driver change
> suggests, I want to use two compatibles. 9574 followed by 8074 fallback,
> just like we do for all Qualcomm IP blocks. Then as you said - no need
> for driver change.

With schema like this
	items:
	  - enum:
	      - qcom,ipq8074-tsens
	      - qcom,ipq9574-tsens
and DTS as
	compatible = "qcom,ipq9574-tsens", "qcom,ipq8074-tsens";

'make dtbs_check' gives the following error

arch/arm64/boot/dts/qcom/ipq9574-rdp433.dtb: thermal-sensor@...000: compatible: 'oneOf' conditional failed, one must be fixed:
        ['qcom,ipq9574-tsens', 'qcom,ipq8074-tsens'] is too long

To fix the above error, I have to change the schema as

	items:
	  - enum:
	      - qcom,ipq8074-tsens
	      - qcom,ipq9574-tsens
	  - const: qcom,tsens-v2-combined-int

and change ipq8074 & ipq9754 DTS as

	compatible = "qcom,ipq8074-tsens", "qcom,tsens-v2-combined-int";
	compatible = "qcom,ipq9574-tsens", "qcom,tsens-v2-combined-int";

For this to work, have to introduce qcom,tsens-v2-combined-int in
the driver with
	}, {
		.compatible = "qcom,tsens-v2-combined-int",
		.data = &data_ipq8074,
	},

This i guess will defeat the purpose. So shall we leave it as it
is now, or shall I change driver, schema and ipq8074 + ip9574 DTS
with qcom,tsens-v2-combined-int? Let me know.

Thanks
Varada



> Best regards,
> Krzysztof