linux-kernel - Re: [PATCH v4 1/4] dt-bindings: clock: Add DT bindings for PLL of Toshiba Visconti TMPV770x SoC

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Message-ID: <163021379431.2676726.15668763072935534900@swboyd.mtv.corp.google.com>
Date:   Sat, 28 Aug 2021 22:09:54 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        punit1.agrawal@...hiba.co.jp, yuji2.ishikawa@...hiba.co.jp,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
Subject: Re: [PATCH v4 1/4] dt-bindings: clock: Add DT bindings for PLL of Toshiba Visconti TMPV770x SoC

Quoting Nobuhiro Iwamatsu (2021-08-04 02:22:41)
> Add device tree bindings for PLL of Toshiba Visconti TMPV770x SoC series.
> 
> Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
> ---
>  .../clock/toshiba,tmpv770x-pipllct.yaml       | 57 +++++++++++++++++++
>  1 file changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/toshiba,tmpv770x-pipllct.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/toshiba,tmpv770x-pipllct.yaml b/Documentation/devicetree/bindings/clock/toshiba,tmpv770x-pipllct.yaml
> new file mode 100644
> index 000000000000..7b7300ce96d6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/toshiba,tmpv770x-pipllct.yaml
> @@ -0,0 +1,57 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/toshiba,tmpv770x-pipllct.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Toshiba Visconti5 TMPV770X PLL Controller Device Tree Bindings
> +
> +maintainers:
> +  - Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
> +
> +description:
> +  Toshia Visconti5 PLL controller which supports the PLLs on TMPV770X.
> +
> +properties:
> +  compatible:
> +    const: toshiba,tmpv7708-pipllct
> +
> +  reg:
> +    maxItems: 1
> +
> +  '#clock-cells':
> +    const: 1
> +
> +  clocks:
> +    description: External reference clock (OSC2)
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#clock-cells"
> +  - clocks
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +
> +    osc2_clk: osc2-clk {
> +      compatible = "fixed-clock";
> +      clock-frequency = <20000000>;
> +      #clock-cells = <0>;
> +    };
> +
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        pipllct: clock-controller@...20000 {
> +            compatible = "toshiba,tmpv7708-pipllct";

The driver makes it look like this is actually part of a syscon node. Is
that right? It's not clear to me that this is a syscon. But then looking
at the binding it seems that one device has been split up into PLL and
"not PLL" parts sort of arbitrarily.

> +            reg = <0 0x24220000 0 0x820>;
> +            #clock-cells = <1>;
> +            clocks = <&osc2_clk>;
> +        };
> +    };
> +...