linux-kernel - Re: [PATCH 1/4] dt-bindings: stm32: add clocks and reset binding for stm32mp25 platform

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Message-ID: <a0231a23-89be-4b44-aae0-ee0bb332f2ae@kernel.org>
Date:   Tue, 7 Nov 2023 08:27:03 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     gabriel.fernandez@...s.st.com,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] dt-bindings: stm32: add clocks and reset binding for
 stm32mp25 platform

On 06/11/2023 15:18, gabriel.fernandez@...s.st.com wrote:
> From: Gabriel Fernandez <gabriel.fernandez@...s.st.com>
> 
> Adds clock and reset binding entries for STM32MP25 SoC family
> 
> Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...s.st.com>

This was based on some very old tree. Please work on latest release,
maintainer's tree or linux-next. Otherwise we need to point the same
issues we already fixed. This would be quite a waste of time, don't you
think?


> ---
>  .../bindings/clock/st,stm32mp25-rcc.yaml      | 116 +++++
>  include/dt-bindings/clock/stm32mp25-clks.h    | 492 ++++++++++++++++++
>  include/dt-bindings/reset/stm32mp25-resets.h  | 167 ++++++
>  3 files changed, 775 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml
>  create mode 100644 include/dt-bindings/clock/stm32mp25-clks.h
>  create mode 100644 include/dt-bindings/reset/stm32mp25-resets.h
> 
> diff --git a/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml b/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml
> new file mode 100644
> index 000000000000..27c60f3231ba
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml
> @@ -0,0 +1,116 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/st,stm32mp25-rcc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: STM32MP25 Reset Clock Controller
> +
> +maintainers:
> +  - Gabriel Fernandez <gabriel.fernandez@...s.st.com>
> +
> +description: |
> +  The RCC IP is both a reset and a clock controller.
> +  RCC makes also power management (resume/supend and wakeup interrupt).
> +  Please also refer to reset.txt for common reset controller binding usage.

Sorry, what TXT?

> +
> +  This binding uses common clock bindings
> +  Documentation/devicetree/bindings/clock/clock-bindings.txt

Please drop all unrelevant, 5 year old links.

> +
> +  Specifying clocks
> +  =================
> +
> +  All available clocks are defined as preprocessor macros in
> +  dt-bindings/clock/stm32mp25-clks.h header and can be used in device

Not even proper path :/

> +  tree sources.
> +  This file implements defines like:
> +      #define CK_BUS_SDMMC1 245
> +      #define CK_KER_SDMMC1 313

Open other bindings to see how it is done. We expect full path only.
Drop all this irrelevant parts.

> +
> +  Specifying softreset control of devices
> +  =======================================
> +
> +  Device nodes should specify the reset channel required in their "resets"
> +  property, containing a phandle to the reset device node and an index
> +  specifying which channel to use.

Are you now describing how DT and Linux work? Drop.

> +  The index is the bit number within the RCC registers bank, starting from RCC
> +  base address.

No, it should not be. Use IDs. You will get NAK below anyway.

> +  It is calculated as: index = register_offset / 4 * 32 + bit_offset.
> +  Where bit_offset is the bit offset within the register.
> +
> +  For example on STM32MP25, for LTDC reset:
> +     ltdc = RCC_LTDCCFGR offset / 4 * 32 + LTDC_bit_offset
> +          = 0x840 / 4 * 32 + 0 = 16896
> +
> +  The list of valid indices for STM32MP25 is available in:
> +  include/dt-bindings/reset-controller/stm32mp25-resets.h
> +
> +  This file implements defines like:
> +  #define LTDC_R	16896

? I have no clue what you are saying here.

> +
> +properties:
> +  "#clock-cells":
> +    const: 1
> +
> +  "#reset-cells":
> +    const: 1
> +
> +  compatible:
> +    items:
> +      - enum:
> +          - st,stm32mp25-rcc

Compatible is always first.

> +  clocks: true
> +  clock-names: true

NAK, missing constraints.

This does not look at all like any decent bindings. Start from scratch
from recently reviewed bindings.

> +
> +  reg:
> +    maxItems: 1
> +
> +required:
> +  - "#clock-cells"
> +  - "#reset-cells"
> +  - compatible
> +  - reg
> +
> +if:
> +  properties:
> +    compatible:
> +      contains:
> +        enum:
> +          - st,stm32mp25-rcc
> +then:
> +  properties:
> +    clocks:
> +      description: Specifies oscillators.
> +      maxItems: 5
> +
> +    clock-names:
> +      items:
> +        - const: hse
> +        - const: hsi
> +        - const: msi
> +        - const: lse
> +        - const: lsi
> +  required:
> +    - clocks
> +    - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/stm32mp25-clks.h>
> +    #include <dt-bindings/reset/stm32mp25-resets.h>
> +
> +    rcc: rcc@...00000 {
> +        compatible = "st,stm32mp25-rcc";
> +        reg = <0x44200000 0x10000>;
> +        #clock-cells = <1>;
> +        #reset-cells = <1>;
> +        clock-names = "hse", "hsi", "msi", "lse", "lsi";
> +        clocks = <&scmi_clk CK_SCMI_HSE>,
> +                 <&scmi_clk CK_SCMI_HSI>,
> +                 <&scmi_clk CK_SCMI_MSI>,
> +                 <&scmi_clk CK_SCMI_LSE>,
> +                 <&scmi_clk CK_SCMI_LSI>;
> +    };
> +...
> diff --git a/include/dt-bindings/clock/stm32mp25-clks.h b/include/dt-bindings/clock/stm32mp25-clks.h
> new file mode 100644
> index 000000000000..9876ee0dd1e4
> --- /dev/null
> +++ b/include/dt-bindings/clock/stm32mp25-clks.h

Same filename as bindings.

> @@ -0,0 +1,492 @@
> +/* SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause */
> +/*
> + * Copyright (C) STMicroelectronics 2023 - All Rights Reserved
> + * Author: Gabriel Fernandez <gabriel.fernandez@...s.st.com>
> + */
> +
> +#ifndef _DT_BINDINGS_STM32MP25_CLKS_H_
> +#define _DT_BINDINGS_STM32MP25_CLKS_H_
> +


...

> +#endif /* _DT_BINDINGS_STM32MP25_CLKS_H_ */
> diff --git a/include/dt-bindings/reset/stm32mp25-resets.h b/include/dt-bindings/reset/stm32mp25-resets.h
> new file mode 100644
> index 000000000000..3a4a9eef6a95
> --- /dev/null
> +++ b/include/dt-bindings/reset/stm32mp25-resets.h

Filename matching compatible format.

> @@ -0,0 +1,167 @@
> +/* SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause */
> +/*
> + * Copyright (C) STMicroelectronics 2023 - All Rights Reserved
> + * Author(s): Gabriel Fernandez <gabriel.fernandez@...s.st.com>
> + */
> +
> +#ifndef _DT_BINDINGS_STM32MP25_RESET_H_
> +#define _DT_BINDINGS_STM32MP25_RESET_H_
> +
> +#define SYS_R		8192

NAK, don't put register values into the bindings. There is no single
need of it. Use IDs (which start from 0 and are incremented by 1) or
drop it.



Best regards,
Krzysztof