linux-kernel - Re: [PATCH 2/5] dt-bindings: clock: mobileye,eyeq5-clk: add bindings

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Message-ID: <2fb31811-b277-4f19-aaac-dc5ce9e99c34@linaro.org>
Date: Tue, 19 Dec 2023 08:38:10 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Théo Lebrun <theo.lebrun@...tlin.com>,
 Gregory CLEMENT <gregory.clement@...tlin.com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>,
 linux-mips@...r.kernel.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 Tawfik Bayouk <tawfik.bayouk@...ileye.com>
Subject: Re: [PATCH 2/5] dt-bindings: clock: mobileye,eyeq5-clk: add bindings

On 18/12/2023 18:14, Théo Lebrun wrote:
> Add DT schema bindings for the EyeQ5 clock controller driver.
> 
> Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
> ---
>  .../bindings/clock/mobileye,eyeq5-clk.yaml         | 83 ++++++++++++++++++++++
>  MAINTAINERS                                        |  2 +
>  include/dt-bindings/clock/mobileye,eyeq5-clk.h     | 22 ++++++
>  3 files changed, 107 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/clock/mobileye,eyeq5-clk.yaml b/Documentation/devicetree/bindings/clock/mobileye,eyeq5-clk.yaml
> new file mode 100644
> index 000000000000..d56482a06bf1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/mobileye,eyeq5-clk.yaml
> @@ -0,0 +1,83 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/mobileye,eyeq5-clk.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Mobileye EyeQ5 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.
> +  It is custom to this platform, its registers live in a shared region called
> +  OLB.
> +
> +maintainers:
> +  - Grégory Clement <gregory.clement@...tlin.com>
> +  - Théo Lebrun <theo.lebrun@...tlin.com>
> +  - Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>
> +
> +properties:
> +  $nodename:
> +    pattern: "^clocks$"

No, that's not correct pattern.

Node names should be generic. See also an explanation and list of
examples (not exhaustive) in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation


> +    description:
> +      We have no unique address, we rely on OLB.

No.

I explained why in pinctrl patchset.

> +
> +  compatible:
> +    const: mobileye,eyeq5-clk
> +
> +  "#clock-cells":
> +    const: 1
> +
> +  clocks:
> +    maxItems: 1
> +    description:
> +      Input parent clock to all PLLs. Expected to be the main crystal.
> +
> +  clock-names:
> +    items:
> +      - const: ref
> +
> +  mobileye,olb:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      A phandle to the OLB syscon. This is a fallback to using the parent as
> +      syscon node.

Drop.

> +
> +required:
> +  - compatible
> +  - "#clock-cells"
> +  - clocks
> +  - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    olb@...000 {
> +      compatible = "mobileye,eyeq5-olb", "syscon", "simple-mfd";

Drop, not related.

> +      reg = <0xe00000 0x400>;
> +      reg-io-width = <4>;
> +
> +      clocks {
> +        compatible = "mobileye,eyeq5-clk";
> +        #clock-cells = <1>;
> +        clocks = <&xtal>;
> +        clock-names = "ref";
> +      };
> +    };
> +
> +  - |
> +    olb: olb@...000 {
> +      compatible = "mobileye,eyeq5-olb", "syscon", "simple-mfd";

Drop, even less related. Still no explanation why you represent the same
hardware in two different ways.


Best regards,
Krzysztof