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Message-ID: <29ece6c8-ddf4-4dcd-b5b4-1cad8bc858d3@linaro.org>
Date: Thu, 11 Apr 2024 08:14:01 +0200
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Subject: Re: [PATCH 02/11] dt-bindings: clock: mobileye,eyeq5-clk: add EyeQ6L
 and EyeQ6H
To: =?UTF-8?Q?Th=C3=A9o_Lebrun?= <theo.lebrun@bootlin.com>,
 Rob Herring <robh@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>,
 Michael Turquette <mturquette@baylibre.com>, Stephen Boyd
 <sboyd@kernel.org>, Philipp Zabel <p.zabel@pengutronix.de>,
 Linus Walleij <linus.walleij@linaro.org>
Cc: linux-mips@vger.kernel.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org,
 linux-gpio@vger.kernel.org,
 Vladimir Kondratiev <vladimir.kondratiev@mobileye.com>,
 Gregory CLEMENT <gregory.clement@bootlin.com>,
 Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
 Tawfik Bayouk <tawfik.bayouk@mobileye.com>
References: <20240410-mbly-olb-v1-0-335e496d7be3@bootlin.com>
 <20240410-mbly-olb-v1-2-335e496d7be3@bootlin.com>
Content-Language: en-US
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <20240410-mbly-olb-v1-2-335e496d7be3@bootlin.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

On 10/04/2024 19:12, Théo Lebrun wrote:
> Add bindings describing EyeQ6L and EyeQ6H clock controllers.
> Add constants to index clocks.
> 
> Bindings are conditional for two reasons:
>  - Some compatibles expose a single clock; they do not take clock cells.
>  - All compatibles take a PLLs resource, not all take others (aimed at
>    divider clocks). Those that only take a resource for PLLs do not
>    require named resources.
> 
> Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
> ---
>  .../bindings/clock/mobileye,eyeq5-clk.yaml         | 103 ++++++++++++++++++---
>  MAINTAINERS                                        |   2 +
>  include/dt-bindings/clock/mobileye,eyeq5-clk.h     |  21 +++++
>  3 files changed, 113 insertions(+), 13 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/clock/mobileye,eyeq5-clk.yaml b/Documentation/devicetree/bindings/clock/mobileye,eyeq5-clk.yaml
> index 2d4f2cde1e58..a1651fcce258 100644
> --- a/Documentation/devicetree/bindings/clock/mobileye,eyeq5-clk.yaml
> +++ b/Documentation/devicetree/bindings/clock/mobileye,eyeq5-clk.yaml
> @@ -4,12 +4,13 @@
>  $id: http://devicetree.org/schemas/clock/mobileye,eyeq5-clk.yaml#
>  $schema: http://devicetree.org/meta-schemas/core.yaml#
>  
> -title: Mobileye EyeQ5 clock controller
> +title: Mobileye EyeQ clock controller
>  
>  description:
> -  The EyeQ5 clock controller handles 10 read-only PLLs derived from the main
> -  crystal clock. It also exposes one divider clock, a child of one of the PLLs.
> -  Its registers live in a shared region called OLB.
> +  EyeQ clock controllers expose read-only PLLs derived from main crystal clock.
> +  Some also expose divider clocks, children of specific PLLs. Its registers
> +  live in a shared region called OLB. EyeQ5 and EyeQ6L have a single OLB
> +  instance while EyeQ6H have seven, leading to seven clock controllers.
>  
>  maintainers:
>    - Grégory Clement <gregory.clement@bootlin.com>
> @@ -18,18 +19,23 @@ maintainers:
>  
>  properties:
>    compatible:
> -    const: mobileye,eyeq5-clk
> +    enum:
> +      - mobileye,eyeq5-clk
> +      - mobileye,eyeq6l-clk
> +      - mobileye,eyeq6h-central-clk
> +      - mobileye,eyeq6h-west-clk
> +      - mobileye,eyeq6h-east-clk
> +      - mobileye,eyeq6h-south-clk
> +      - mobileye,eyeq6h-ddr0-clk
> +      - mobileye,eyeq6h-ddr1-clk
> +      - mobileye,eyeq6h-acc-clk
>  
> -  reg:
> -    maxItems: 2
> +  reg: true

No, you must leave widest constraints here.

>  
> -  reg-names:
> -    items:
> -      - const: plls
> -      - const: ospi
> +  reg-names: true

No, you must leave widest constraints here.


>  
>    "#clock-cells":
> -    const: 1
> +    enum: [0, 1]

Looks like you squash here quite different devices...

>  
>    clocks:
>      maxItems: 1
> @@ -43,9 +49,80 @@ properties:
>  required:
>    - compatible
>    - reg
> -  - reg-names
>    - "#clock-cells"
>    - clocks
>    - clock-names
>  
> +allOf:
> +  # "mobileye,eyeq5-clk" provides:
> +  #  - PLLs and,
> +  #  - One divider clock related to ospi.
> +  - if:
> +      properties:
> +        compatible:
> +          const: mobileye,eyeq5-clk
> +    then:
> +      properties:
> +        reg:
> +          minItems: 2
> +          maxItems: 2
> +        reg-names:
> +          minItems: 2
> +          maxItems: 2

So any name is now valid? Like "yellow-pony"?

> +          items:
> +            enum: [ plls, ospi ]
> +      required:
> +        - reg-names
> +
> +  # "mobileye,eyeq6h-south-clk" provides:
> +  #  - PLLs and,
> +  #  - Four divider clocks related to emmc, ospi and tsu.
> +  - if:
> +      properties:
> +        compatible:
> +          const: mobileye,eyeq6h-south-clk
> +    then:
> +      properties:
> +        reg:
> +          minItems: 4
> +          maxItems: 4
> +        reg-names:
> +          minItems: 4
> +          maxItems: 4
> +          items:
> +            enum: [ plls, emmc, ospi, tsu ]
> +      required:
> +        - reg-names
> +
> +  # Other compatibles only provide PLLs. Do not ask for named resources.
> +  - if:
> +      not:
> +        required:
> +          - reg-names
> +    then:
> +      properties:
> +        reg:
> +          minItems: 1
> +          maxItems: 1

No, just restrict properly reg per variant.


> +        reg-names: false

That's redundant. Drop entire if.


> +
> +  # Some compatibles provide a single clock; they do not take a clock cell.
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            - mobileye,eyeq6h-central-clk
> +            - mobileye,eyeq6h-west-clk
> +            - mobileye,eyeq6h-east-clk
> +            - mobileye,eyeq6h-ddr0-clk
> +            - mobileye,eyeq6h-ddr1-clk
> +    then:
> +      properties:
> +        "#clock-cells":
> +          const: 0

Wait, so you define device-per-clock? That's a terrible idea. We also
discussed it many times and it was rejected many times.

You have one device, not 5.


Best regards,
Krzysztof