linux-kernel - Re: [PATCH v4 09/42] dt-bindings: soc: Add Cirrus EP93xx

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Message-ID: <84931c58-1f5b-02c7-0204-a67871f89a6a@linaro.org>
Date:   Fri, 15 Sep 2023 12:42:43 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     nikita.shubin@...uefel.me, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v4 09/42] dt-bindings: soc: Add Cirrus EP93xx

On 15/09/2023 10:10, Nikita Shubin via B4 Relay wrote:
> From: Nikita Shubin <nikita.shubin@...uefel.me>
> 
> Add device tree bindings for the Cirrus Logic EP93xx SoC.
> 
> Signed-off-by: Nikita Shubin <nikita.shubin@...uefel.me>
> ---
>  .../bindings/arm/cirrus/cirrus,ep9301.yaml         | 38 ++++++++++++
>  .../bindings/soc/cirrus/cirrus,ep9301-syscon.yaml  | 71 ++++++++++++++++++++++
>  2 files changed, 109 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/arm/cirrus/cirrus,ep9301.yaml b/Documentation/devicetree/bindings/arm/cirrus/cirrus,ep9301.yaml
> new file mode 100644
> index 000000000000..97dd8b6aefa9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/cirrus/cirrus,ep9301.yaml
> @@ -0,0 +1,38 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/arm/cirrus/cirrus,ep9301.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Cirrus Logic EP93xx platforms
> +
> +description:
> +  The EP93xx SoC is a ARMv4T-based with 200 MHz ARM9 CPU.
> +
> +maintainers:
> +  - Alexander Sverdlin <alexander.sverdlin@...il.com>
> +  - Nikita Shubin <nikita.shubin@...uefel.me>
> +
> +properties:
> +  $nodename:
> +    const: '/'
> +  compatible:
> +    oneOf:
> +      - description: The TS-7250 is a compact, full-featured Single Board Computer (SBC)
> +          based upon the Cirrus EP9302 ARM9 CPU
> +        items:
> +          - const: technologic,ts7250
> +          - const: cirrus,ep9301
> +
> +      - description: The Liebherr BK3 is a derivate from ts7250 board
> +        items:
> +          - const: liebherr,bk3
> +          - const: cirrus,ep9301
> +
> +      - description: EDB302 is an evaluation board by Cirrus Logic,
> +          based on a Cirrus Logic EP9302 CPU
> +        items:
> +          - const: cirrus,edb9302
> +          - const: cirrus,ep9301
> +
> +additionalProperties: true
> diff --git a/Documentation/devicetree/bindings/soc/cirrus/cirrus,ep9301-syscon.yaml b/Documentation/devicetree/bindings/soc/cirrus/cirrus,ep9301-syscon.yaml
> new file mode 100644
> index 000000000000..1692250251d9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/cirrus/cirrus,ep9301-syscon.yaml
> @@ -0,0 +1,71 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/cirrus/cirrus,ep9301-syscon.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Cirrus Logic EP93xx Platforms System Controller
> +
> +maintainers:
> +  - Alexander Sverdlin <alexander.sverdlin@...il.com>
> +  - Nikita Shubin <nikita.shubin@...uefel.me>
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - items:
> +          - enum:
> +              - cirrus,ep9302-syscon
> +              - cirrus,ep9307-syscon
> +              - cirrus,ep9312-syscon
> +              - cirrus,ep9315-syscon
> +          - const: cirrus,ep9301-syscon
> +          - const: syscon
> +          - const: simple-mfd
> +      - items:
> +          - const: cirrus,ep9301-syscon
> +          - const: syscon
> +          - const: simple-mfd
> +
> +  reg:
> +    maxItems: 1
> +
> +  reboot:
> +    type: object
> +    $ref: /schemas/power/reset/cirrus,ep9301-reboot.yaml

There is no need to have empty node without any resources. There are no
benefits of this. Drop entire reboot schema and instantiate your driver
from parent device. simple-mfd also goes away. syscon probably as well,
unless you export registers for other devices?

> +
> +  clock-controller:
> +    type: object
> +    $ref: /schemas/clock/cirrus,ep9301-clk.yaml

This could be okay, if it took address. But it doesn't, so again, this
can be just part of top node. Unless this is a separate device and you
miss here proper reg/addressing?


> +
> +  pinctrl:
> +    type: object
> +    $ref: /schemas/pinctrl/cirrus,ep9301-pinctrl.yaml

No need, drop entire schema and node, just like with reboot.

> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    syscon@...30000 {
> +        compatible = "cirrus,ep9301-syscon",
> +                     "syscon", "simple-mfd";
> +        reg = <0x80930000 0x1000>;
Best regards,
Krzysztof