linux-kernel - Re: [PATCH 1/7] dt-bindings: soc: add bindings for i.MX93 SRC

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Message-ID: <c2882212-aa1e-4614-c982-43e6c793b34a@linaro.org>
Date:   Tue, 24 May 2022 12:07:34 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, sboyd@...nel.org,
        mturquette@...libre.com, shawnguo@...nel.org,
        s.hauer@...gutronix.de
Cc:     aisheng.dong@....com, l.stach@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH 1/7] dt-bindings: soc: add bindings for i.MX93 SRC

On 23/05/2022 13:30, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Add bindings for i.MX93 System Reset Controller(SRC). SRC supports
> resets and power gating for mixes.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  .../bindings/soc/imx/fsl,imx93-src.yaml       | 88 +++++++++++++++++++
>  include/dt-bindings/power/imx93-power.h       | 11 +++
>  2 files changed, 99 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/imx/fsl,imx93-src.yaml

File should be in respective subsystem, so probably power/reset?

>  create mode 100644 include/dt-bindings/power/imx93-power.h
> 
> diff --git a/Documentation/devicetree/bindings/soc/imx/fsl,imx93-src.yaml b/Documentation/devicetree/bindings/soc/imx/fsl,imx93-src.yaml
> new file mode 100644
> index 000000000000..d45c1458b9c1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/imx/fsl,imx93-src.yaml
> @@ -0,0 +1,88 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/imx/fsl,imx93-src.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP i.MX9 System Reset Controller
> +
> +maintainers:
> +  - Peng Fan <peng.fan@....com>
> +
> +description: |
> +  The System Reset Controller (SRC) is responsible for the generation of
> +  all the system reset signals and boot argument latching.
> +
> +  Its main functions are as follows,
> +  - Deals with all global system reset sources from other modules,
> +    and generates global system reset.
> +  - Responsible for power gating of MIXs (Slices) and their memory
> +    low power control.
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: fsl,imx93-src
> +      - const: syscon
> +
> +  reg:
> +    maxItems: 1
> +
> +  slice:

Why do you need this subnode, instead of listing domains here?

> +    type: object
> +    description: list of power domains provided by this controller.
> +

Hm, what about address/size cells? Is syscon schema bringing these?

> +    patternProperties:
> +      "power-domain@[0-9]$":
> +        type: object

Missing ref to power-domain.yaml

> +        properties:
> +
> +          '#power-domain-cells':
> +            const: 0
> +
> +          reg:
> +            description: |
> +              Power domain index. Valid values are defined in
> +              include/dt-bindings/power/imx93-power.h for fsl,imx93-src
> +            maxItems: 1
> +
> +          clocks:
> +            description: |
> +              A number of phandles to clocks that need to be enabled
> +              during domain power-up sequencing to ensure reset
> +              propagation into devices located inside this power domain.
> +            minItems: 1
> +            maxItems: 5
> +
> +        required:
> +          - '#power-domain-cells'
> +          - reg
> +
> +required:
> +  - compatible
> +  - reg
> +  - slice
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/imx93-clock.h>
> +    #include <dt-bindings/power/imx93-power.h>
> +
> +    src@...60000 {

reset-controller
or some other generic node name.

> +        compatible = "fsl,imx93-src", "syscon";
> +        reg = <0x44460000 0x10000>;
> +
> +        slice {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +
> +                mediamix: power-domain@0 {

Best regards,
Krzysztof