Subject: Re: [PATCH v3 3/6] dt-bindings: devfreq: Add bindings for imx ddr controller

From: Rob Herring <[email-masked]>
Date: Mon, 4 Nov 2019 16:21:26 -0600

On Thu, Oct 31, 2019 at 11:50:24PM +0200, Leonard Crestez wrote:
> Add devicetree bindings for the i.MX DDR Controller on imx8m series
> chips. It supports dynamic frequency switching between multiple data
> rates and this is exposed to Linux via the devfreq subsystem.
> 
> Signed-off-by: Leonard Crestez <[email-masked]>
> ---
>  .../devicetree/bindings/devfreq/imx-ddrc.yaml | 60 +++++++++++++++++++

.../bindings/memory-controllers/

>  1 file changed, 60 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml b/Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml
> new file mode 100644
> index 000000000000..31db204e6845
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml
> @@ -0,0 +1,60 @@
> +# SPDX-License-Identifier: GPL-2.0

For new bindings:

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/devfreq/imx-devfreq.yaml#

Run 'make dt_binding_check'. This will fail as the filename doesn't 
match.

> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: i.MX DDR Controller

Perhaps i.MX8x as it's not all i.MX chips. And the filename too?

> +
> +maintainers:
> +  - Leonard Crestez <[email-masked]>
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +        - fsl,imx8mn-ddrc
> +        - fsl,imx8mm-ddrc
> +        - fsl,imx8mq-ddrc
> +      - const: fsl,imx8m-ddrc
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 4
> +
> +  clock-names:
> +    items:
> +      - const: dram_core
> +      - const: dram_pll
> +      - const: dram_alt
> +      - const: dram_apb

Drop 'dram_'

> +
> +  operating-points-v2: true
> +
> +  devfreq-events:
> +    description: Phandle of PMU node
> +    $ref: "/schemas/types.yaml#/definitions/phandle"
> +
> +required:
> +  - reg
> +  - compatible
> +  - clocks
> +  - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/imx8mm-clock.h>
> +    ddrc: dram-controller@3d400000 {
> +        compatible = "fsl,imx8mm-ddrc", "fsl,imx8m-ddrc";
> +        reg = <0x3d400000 0x400000>;
> +        clock-names = "dram_core", "dram_pll", "dram_alt", "dram_apb";
> +        clocks = <&clk IMX8MM_CLK_DRAM_CORE>,
> +                 <&clk IMX8MM_DRAM_PLL>,
> +                 <&clk IMX8MM_CLK_DRAM_ALT>,
> +                 <&clk IMX8MM_CLK_DRAM_APB>;
> +        operating-points-v2 = <&ddrc_opp_table>;
> +    };
> -- 
> 2.17.1
> 

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