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

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Date:   Fri, 2 Dec 2022 21:19:04 +0200
From:   Abel Vesa <abel.vesa@...aro.org>
To:     Bjorn Andersson <andersson@...nel.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 22-12-01 16:12:20, Bjorn Andersson wrote:
> 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.

I think there is a rule that says the compatible string to be the same as
the schema filename.

Should I then also rename the schema file and also the binding IDs header?
Like qcom,sm8550-tcsr.yaml and qcom,sm8550-tcsr.h ?

> 
> > +
> > +  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.

Right, will document the clocks property as well and describe the clock
as xo-board.

> 
> 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
> >