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Date:   Mon, 11 Jan 2021 15:42:00 -0600
From:   Rob Herring <robh@...nel.org>
To:     Kiran Gunda <kgunda@...eaurora.org>
Cc:     swboyd@...omium.org, lee.jones@...aro.org, agross@...nel.org,
        bjorn.andersson@...aro.org, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        mark.rutland@....com, linux-arm-msm-owner@...r.kernel.org,
        Stephen Boyd <sboyd@...nel.org>
Subject: Re: [PATCH V5 1/2] mfd: qcom-spmi-pmic: Convert bindings to .yaml
 format

On Wed, Dec 30, 2020 at 05:26:22PM +0530, Kiran Gunda wrote:
> Convert the bindings from .txt to .yaml format.
> 
> Signed-off-by: Kiran Gunda <kgunda@...eaurora.org>
> ---
>  .../devicetree/bindings/mfd/qcom,spmi-pmic.txt     |  80 --------------
>  .../devicetree/bindings/mfd/qcom,spmi-pmic.yaml    | 117 +++++++++++++++++++++
>  2 files changed, 117 insertions(+), 80 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.txt
>  create mode 100644 Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.yaml

> diff --git a/Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.yaml b/Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.yaml
> new file mode 100644
> index 0000000..b753bdb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.yaml
> @@ -0,0 +1,117 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/qcom,spmi-pmic.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm SPMI PMICs multi-function device bindings
> +
> +maintainers:
> +  - Stephen Boyd <sboyd@...nel.org>
> +  - Kiran Gunda <kgunda@...eaurora.org>
> +
> +description: |
> +  The Qualcomm SPMI PMICs use a QPNP scheme through SPMI interface.
> +  QPNP is effectively a partitioning scheme for dividing the SPMI extended
> +  register space up into logical pieces, and set of fixed register
> +  locations/definitions within these regions, with some of these regions
> +  specifically used for interrupt handling.
> +
> +  The QPNP PMICs are used with the Qualcomm Snapdragon series SoCs, and are
> +  interfaced to the chip via the SPMI (System Power Management Interface) bus.
> +  Support for multiple independent functions are implemented by splitting the
> +  16-bit SPMI slave address space into 256 smaller fixed-size regions, 256 bytes
> +  each. A function can consume one or more of these fixed-size register regions.
> +
> +properties:
> +  spmi_bus:
> +    type: object
> +    description: SPMI bus node

This is outside the scope of this binding.

> +
> +patternProperties:
> +  "^pmic@[0-9]$":
> +    description: Child PMIC nodes
> +    type: object

You've defined spmi_bus and pmic@... as siblings. I assume you meant 
parent/child instead. You'd need to indent all this 4 more spaces. 

However, this is also outside the scope of the binding and should be 
removed.

> +
> +    properties:
> +      compatible:

So this needs to be at the top level. 'compatible' is also how we decide 
to apply a schema to a node. What you did here will never be applied. 
Introduce an error to the example and see.

> +        items:
> +          - enum:
> +              # Sorted based on subtype ID the device reports
> +              - qcom,pm8941
> +              - qcom,pm8841
> +              - qcom,pma8084
> +              - qcom,pm8019
> +              - qcom,pm8226
> +              - qcom,pm8110
> +              - qcom,pma8084
> +              - qcom,pmi8962
> +              - qcom,pmd9635
> +              - qcom,pm8994
> +              - qcom,pmi8994
> +              - qcom,pm8916
> +              - qcom,pm8004
> +              - qcom,pm8909
> +              - qcom,pm8950
> +              - qcom,pmi8950
> +              - qcom,pm8998
> +              - qcom,pmi8998
> +              - qcom,pm8005
> +              - qcom,pm660l
> +              - qcom,pm660
> +
> +          - enum:
> +              - qcom,spmi-pmic

You can use 'const' here instead of enum.

> +
> +      reg:
> +        maxItems: 1
> +        description:
> +          Specifies the SPMI USID slave address for this device.
> +          For more information see bindings/spmi/spmi.txt
> +
> +    patternProperties:
> +      "^[a-zA-Z0-9]$":
> +        description:
> +          Each child node of SPMI slave id represents a function of the PMIC.
> +          In the example below the rtc device node represents a peripheral of
> +          pm8941 SID = 0. The regulator device node represents a peripheral of
> +          pm8941 SID = 1.
> +        type: object

No, you need to define all the child nodes. This may mean you need to 
split to several schemas if each PMIC has different sub devices.

> +
> +    required:
> +      - compatible
> +      - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/spmi/spmi.h>
> +
> +    spmi_bus {
> +        compatible = "qcom,spmi-pmic-arb";
> +        #address-cells = <2>;
> +        #size-cells = <0>;
> +
> +        pmic@0 {
> +         compatible = "qcom,pm8941";
> +         reg = <0x0 SPMI_USID>;
> +
> +         rtc {
> +           compatible = "qcom,rtc";

Not documented nor used anywhere.

> +           interrupts = <0x0 0x61 0x1 0x1>;
> +           interrupt-names = "alarm";
> +          };
> +        };
> +
> +        pmic@1 {
> +         compatible = "qcom,pm8941";
> +         reg = <0x1 SPMI_USID>;
> +
> +         regulator {
> +           compatible = "qcom,regulator";

Same here.

> +           regulator-name = "8941_boost";
> +           };
> +          };
> +        };
> +...
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
>  a Linux Foundation Collaborative Project
> 

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