linux-kernel - Re: [PATCH v5 1/4] dt-bindings: clock: add ExynosAuto v920 SoC CMU bindings

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Message-ID: <db84ee7d-dfd8-4e15-9745-01b1a76566ad@kernel.org>
Date: Wed, 31 Jul 2024 11:27:24 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Sunyeal Hong <sunyeal.hong@...sung.com>,
 Sylwester Nawrocki <s.nawrocki@...sung.com>,
 Chanwoo Choi <cw00.choi@...sung.com>, Alim Akhtar <alim.akhtar@...sung.com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/4] dt-bindings: clock: add ExynosAuto v920 SoC CMU
 bindings

On 30/07/2024 09:12, Sunyeal Hong wrote:
> Add dt-schema for ExynosAuto v920 SoC clock controller.
> Add device tree clock binding definitions for below CMU blocks.
> 
> - CMU_TOP
> - CMU_PERIC0
> 
> Signed-off-by: Sunyeal Hong <sunyeal.hong@...sung.com>
> ---
>  .../clock/samsung,exynosautov920-clock.yaml   | 115 +++++++++++
>  .../clock/samsung,exynosautov920.h            | 191 ++++++++++++++++++
>  2 files changed, 306 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/samsung,exynosautov920-clock.yaml
>  create mode 100644 include/dt-bindings/clock/samsung,exynosautov920.h
> 
> diff --git a/Documentation/devicetree/bindings/clock/samsung,exynosautov920-clock.yaml b/Documentation/devicetree/bindings/clock/samsung,exynosautov920-clock.yaml
> new file mode 100644
> index 000000000000..d5c50997107d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/samsung,exynosautov920-clock.yaml
> @@ -0,0 +1,115 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/samsung,exynosautov920-clock.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Samsung ExynosAuto v920 SoC clock controller
> +
> +maintainers:
> +  - Sunyeal Hong <sunyeal.hong@...sung.com>
> +  - Chanwoo Choi <cw00.choi@...sung.com>
> +  - Krzysztof Kozlowski <krzk@...nel.org>
> +  - Sylwester Nawrocki <s.nawrocki@...sung.com>
> +
> +description: |
> +  ExynosAuto v920 clock controller is comprised of several CMU units, generating
> +  clocks for different domains. Those CMU units are modeled as separate device
> +  tree nodes, and might depend on each other. Root clocks in that clock tree are
> +  two external clocks:: OSCCLK/XTCXO (38.4 MHz) and RTCCLK/XrtcXTI (32768 Hz).
> +  The external OSCCLK must be defined as fixed-rate clock in dts.
> +
> +  CMU_TOP is a top-level CMU, where all base clocks are prepared using PLLs and
> +  dividers; all other clocks of function blocks (other CMUs) are usually
> +  derived from CMU_TOP.
> +
> +  Each clock is assigned an identifier and client nodes can use this identifier
> +  to specify the clock which they consume. All clocks available for usage
> +  in clock consumer nodes are defined as preprocessor macros in
> +  'include/dt-bindings/clock/samsung,exynosautov920.h' header.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - samsung,exynosautov920-cmu-top
> +      - samsung,exynosautov920-cmu-peric0

Maybe I misinterpreted previous discussion, but I had impression that
binding was incomplete and you wanted to add more devices?

> +
> +  clocks:
> +    minItems: 1
> +    items:
> +      - description: External reference clock (38.4 MHz)
> +      - description: Block NOC clock (from CMU_TOP)
> +      - description: Block IP clock (from CMU_TOP)
> +
> +  clock-names:
> +    minItems: 1
> +    items:
> +      - const: oscclk
> +      - const: noc
> +      - const: ip
> +
> +  "#clock-cells":
> +    const: 1
> +
> +  reg:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - "#clock-cells"
> +  - clocks
> +  - clock-names
> +  - reg
> +
> +if:

There was allOf here. It should stay - it saves you indentation when
this grows.

> +  properties:
> +    compatible:
> +      enum:
> +        - samsung,exynosautov920-cmu-top
> +
> +then:
> +  properties:
> +    clocks:
> +      maxItems: 1
> +
> +    clock-names:
> +      maxItems: 1
> +
> +else:
> +  if:

No nested if:else:if:. See the other examples.



Best regards,
Krzysztof