Re: [PATCH v5 3/5] dt-bindings: clock: imx8mp: Add audiomix block control

[Marco Felsch <m.felsch@pengutronix.de>]

Hi Marek,

sorry for the late review on this, please see below.

On 23-02-27, Marek Vasut wrote:
> Unlike the other block control IPs in i.MX8M, the audiomix is mostly a
> series of clock gates and muxes. Add DT bindings for this IP.
> 
> Reviewed-by: Rob Herring <robh@kernel.org>
> Tested-by: Adam Ford <aford173@gmail.com> #imx8mp-beacon-kit
> Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> Signed-off-by: Marek Vasut <marex@denx.de>
> ---
> Cc: Abel Vesa <abelvesa@kernel.org>
> Cc: Alexander Stein <alexander.stein@ew.tq-group.com>
> Cc: Fabio Estevam <festevam@gmail.com>
> Cc: Jacky Bai <ping.bai@nxp.com>
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Cc: Luca Ceresoli <luca.ceresoli@bootlin.com>
> Cc: Lucas Stach <l.stach@pengutronix.de>
> Cc: Marco Felsch <m.felsch@pengutronix.de>
> Cc: Michael Turquette <mturquette@baylibre.com>
> Cc: NXP Linux Team <linux-imx@nxp.com>
> Cc: Peng Fan <peng.fan@nxp.com>
> Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
> Cc: Richard Cochran <richardcochran@gmail.com>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Shawn Guo <shawnguo@kernel.org>
> Cc: Stephen Boyd <sboyd@kernel.org>
> Cc: devicetree@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-clk@vger.kernel.org
> ---
> V2: No change
> V3: - Add missed RB from Rob from V1
>     - Rename audio_ahb to plain ahb
> V4: - Rebase on next 20230223
> V5: Add TB from Adam and Alexander
> ---
>  .../bindings/clock/imx8mp-audiomix.yaml       | 84 +++++++++++++++++++
>  1 file changed, 84 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/imx8mp-audiomix.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/imx8mp-audiomix.yaml b/Documentation/devicetree/bindings/clock/imx8mp-audiomix.yaml
> new file mode 100644
> index 0000000000000..01b4e1e311cef
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/imx8mp-audiomix.yaml
> @@ -0,0 +1,84 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/imx8mp-audiomix.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP i.MX8MP AudioMIX Block Control Binding
> +
> +maintainers:
> +  - Marek Vasut <marex@denx.de>
> +
> +description: |
> +  NXP i.MX8M Plus AudioMIX is dedicated clock muxing and gating IP
> +  used to control Audio related clock on the SoC.
> +
> +properties:
> +  compatible:
> +    const: fsl,imx8mp-audio-blk-ctrl
> +
> +  reg:
> +    maxItems: 1
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  power-domain-names:
> +    const: audio

Why do we need to specify the name here? We have just one power-domain,
so there should be no need to distinguish between them, or do I miss
something?

> +
> +  clocks:
> +    minItems: 7
> +    maxItems: 7
> +
> +  clock-names:
> +    items:
> +      - const: ahb
> +      - const: sai1
> +      - const: sai2
> +      - const: sai3
> +      - const: sai5
> +      - const: sai6
> +      - const: sai7
> +
> +  '#clock-cells':
> +    const: 1
> +    description:
> +      The clock consumer should specify the desired clock by having the clock
> +      ID in its "clocks" phandle cell. See include/dt-bindings/clock/imx8mp-clock.h
> +      for the full list of i.MX8MP IMX8MP_CLK_AUDIOMIX_ clock IDs.
> +
> +required:
> +  - compatible
> +  - reg
> +  - power-domains
> +  - power-domain-names

We can drop the power-domain-names here as well.

> +  - clocks
> +  - clock-names
> +  - '#clock-cells'
> +
> +additionalProperties: false
> +
> +examples:
> +  # Clock Control Module node:
> +  - |
> +    #include <dt-bindings/clock/imx8mp-clock.h>
> +
> +    clock-controller@30e20000 {
> +        #clock-cells = <1>;
> +        compatible = "fsl,imx8mp-audio-blk-ctrl";
> +        clocks = <&clk IMX8MP_CLK_AUDIO_ROOT>,
> +                 <&clk IMX8MP_CLK_SAI1>,
> +                 <&clk IMX8MP_CLK_SAI2>,
> +                 <&clk IMX8MP_CLK_SAI3>,
> +                 <&clk IMX8MP_CLK_SAI5>,
> +                 <&clk IMX8MP_CLK_SAI6>,
> +                 <&clk IMX8MP_CLK_SAI7>;
> +        clock-names = "ahb",
> +                      "sai1", "sai2", "sai3",
> +                      "sai5", "sai6", "sai7";
> +        power-domains = <&pgc_audio>;
> +        power-domain-names = "audio";
> +        reg = <0x30e20000 0x10000>;

It is common to have have the compatible as the first property followed
by the reg property. We should change this here as well as in the
8mp.dtsi patch.

Regards,
  Marco

> +    };
> +
> +...
> -- 
> 2.39.2
> 
> 

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