linux-kernel - Re: [PATCH v5 1/4] dt-bindings: spmi: Add PMIC ARB v7 schema

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Date: Thu, 22 Feb 2024 13:14:35 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Abel Vesa <abel.vesa@...aro.org>, Stephen Boyd <sboyd@...nel.org>,
 Matthias Brugger <matthias.bgg@...il.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Neil Armstrong <neil.armstrong@...aro.org>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: Srini Kandagatla <srinivas.kandagatla@...aro.org>,
 Johan Hovold <johan@...nel.org>, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
 linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 1/4] dt-bindings: spmi: Add PMIC ARB v7 schema

On 21/02/2024 13:52, Abel Vesa wrote:
> Add dedicated schema for PMIC ARB v7 as it allows multiple
> buses by declaring them as child nodes. These child nodes
> will follow the generic spmi bus bindings.
> 
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> ---


> +
> +description: |
> +  The SPMI PMIC Arbiter v7 is found on Snapdragon chipsets. It is an SPMI
> +  controller with wrapping arbitration logic to allow for multiple on-chip
> +  devices to control up to 2 SPMI separate buses.
> +
> +  The PMIC Arbiter can also act as an interrupt controller, providing interrupts
> +  to slave devices.
> +
> +properties:
> +  compatible:
> +    const: qcom,spmi-pmic-arb-v7

I dislike the versioning. Previous PMIC ARB binding said "it will cover
everything" and now it turns out that everything is not everything. I
would suggest SoC specific compatibles.

> +
> +  reg:
> +    items:
> +      - description: core registers
> +      - description: tx-channel per virtual slave regosters
> +      - description: rx-channel (called observer) per virtual slave registers
> +
> +  reg-names:
> +    items:
> +      - const: core
> +      - const: chnls
> +      - const: obsrvr
> +
> +  ranges: true
> +
> +  '#address-cells':
> +    const: 2
> +
> +  '#size-cells':
> +    const: 2
> +
> +  qcom,ee:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    minimum: 0
> +    maximum: 5
> +    description: >
> +      indicates the active Execution Environment identifier
> +
> +  qcom,channel:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    minimum: 0
> +    maximum: 5
> +    description: >
> +      which of the PMIC Arb provided channels to use for accesses

We should probably deprecate qcom,bus-id in qcom,spmi-pmic-arb.yaml.

> +
> +patternProperties:
> +  "spmi@[0-1]$":
> +    type: object
> +    $ref: /schemas/spmi/spmi.yaml

On this level:
unevaluatedProperties: false

> +
> +required:
> +  - compatible
> +  - reg-names
> +  - qcom,ee
> +  - qcom,channel
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    spmi: arbiter@...0000 {
> +      compatible = "qcom,spmi-pmic-arb-v7";
> +      reg = <0x0c400000 0x3000>,
> +            <0x0c500000 0x4000000>,
> +            <0x0c440000 0x80000>;
> +      reg-names = "core", "chnls", "obsrvr";
> +
> +      qcom,ee = <0>;
> +      qcom,channel = <0>;
> +
> +      #address-cells = <2>;
> +      #size-cells = <2>;
> +
> +      spmi_bus0: spmi@0 {
> +        reg = <0 0x0c42d000 0 0x4000>,
> +              <0 0x0c4c0000 0 0x10000>;
> +        reg-names = "cnfg", "intr";
> +
> +        interrupt-names = "periph_irq";
> +        interrupts-extended = <&pdc 1 IRQ_TYPE_LEVEL_HIGH>;
> +        interrupt-controller;
> +        #interrupt-cells = <4>;
> +
> +        qcom,bus-id = <0>;

Please drop. Same in second instance.


Best regards,
Krzysztof