linux-kernel - Re: [PATCH v4 2/9] dt-bindings: clock: Add SM8550 TCSR CC clocks

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Message-ID: <20221201221220.7kdbndug3m3om62p@builder.lan>
Date:   Thu, 1 Dec 2022 16:12:20 -0600
From:   Bjorn Andersson <andersson@...nel.org>
To:     Abel Vesa <abel.vesa@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v4 2/9] dt-bindings: clock: Add SM8550 TCSR CC clocks

On Wed, Nov 30, 2022 at 01:28:45PM +0200, Abel Vesa wrote:
> Add bindings documentation for clock TCSR driver on SM8550.
> 
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
>  .../bindings/clock/qcom,sm8550-tcsrcc.yaml    | 45 +++++++++++++++++++
>  .../dt-bindings/clock/qcom,sm8550-tcsrcc.h    | 18 ++++++++
>  2 files changed, 63 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/qcom,sm8550-tcsrcc.yaml
>  create mode 100644 include/dt-bindings/clock/qcom,sm8550-tcsrcc.h
> 
> diff --git a/Documentation/devicetree/bindings/clock/qcom,sm8550-tcsrcc.yaml b/Documentation/devicetree/bindings/clock/qcom,sm8550-tcsrcc.yaml
> new file mode 100644
> index 000000000000..b2de251328e4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/qcom,sm8550-tcsrcc.yaml
> @@ -0,0 +1,45 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/qcom,sm8550-tcsrcc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm TCSR Clock Controller on SM8550
> +
> +maintainers:
> +  - Bjorn Andersson <andersson@...nel.org>
> +
> +description: |
> +  Qualcomm TCSR clock control module provides the clocks, resets and
> +  power domains on SM8550
> +
> +  See also:: include/dt-bindings/clock/qcom,sm8550-tcsrcc.h
> +
> +properties:
> +  compatible:
> +    const: qcom,sm8550-tcsrcc

The block described is the TCSR block, the clock controller represents
one of the functions provided. I think it would be more appropriate if
the compatible represented the generic nature of the block, even though
you currently only care about exposing these clocks.

> +
> +  reg:
> +    maxItems: 1
> +
> +  '#clock-cells':
> +    const: 1
> +
> +  '#reset-cells':
> +    const: 1
> +

Your clocks are fed by cxo. While there might be reasons for not wire
the parent up in the clocks, I think you should represent it in the
binding.

Regards,
Bjorn

> +required:
> +  - compatible
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    clock-controller@...0000 {
> +      compatible = "qcom,sm8550-tcsrcc";
> +      reg = <0x1fc0000 0x30000>;
> +      #clock-cells = <1>;
> +      #reset-cells = <1>;
> +    };
> +
> +...
> diff --git a/include/dt-bindings/clock/qcom,sm8550-tcsrcc.h b/include/dt-bindings/clock/qcom,sm8550-tcsrcc.h
> new file mode 100644
> index 000000000000..091cb76f953a
> --- /dev/null
> +++ b/include/dt-bindings/clock/qcom,sm8550-tcsrcc.h
> @@ -0,0 +1,18 @@
> +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
> +/*
> + * Copyright (c) 2022, The Linux Foundation. All rights reserved.
> + * Copyright (c) 2022, Linaro Limited
> + */
> +
> +#ifndef _DT_BINDINGS_CLK_QCOM_TCSR_CC_SM8550_H
> +#define _DT_BINDINGS_CLK_QCOM_TCSR_CC_SM8550_H
> +
> +/* TCSR CC clocks */
> +#define TCSR_PCIE_0_CLKREF_EN					0
> +#define TCSR_PCIE_1_CLKREF_EN					1
> +#define TCSR_UFS_CLKREF_EN					2
> +#define TCSR_UFS_PAD_CLKREF_EN					3
> +#define TCSR_USB2_CLKREF_EN					4
> +#define TCSR_USB3_CLKREF_EN					5
> +
> +#endif
> -- 
> 2.34.1
>