linux-kernel - Re: [PATCH v2 2/6] dt-bindings: arm: sunxi: Expand MBUS binding

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Date:   Fri, 15 Oct 2021 17:37:29 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Samuel Holland <samuel@...lland.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/6] dt-bindings: arm: sunxi: Expand MBUS binding

On 10/4/21 10:27 AM, Samuel Holland wrote:
> The MBUS provides more than address translation and bandwidth control.
> It also provides a PMU to measure bandwidth usage by certain masters,
> and it provides notification via IRQ when they are active or idle.
> 
> The MBUS is also tightly integrated with the DRAM controller to provide
> a Memory Dynamic Frequency Scaling (MDFS) feature. In view of this, the
> MBUS binding needs to represent the hardware resources needed for MDFS,
> which include the clocks and MMIO range of the adjacent DRAM controller.
> 
> Add the additional resources for the H3 and A64 compatibles, and a new
> example showing how they are used.
> 
> Signed-off-by: Samuel Holland <samuel@...lland.org>
> ---
>  .../arm/sunxi/allwinner,sun4i-a10-mbus.yaml   | 75 ++++++++++++++++++-
>  1 file changed, 72 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/arm/sunxi/allwinner,sun4i-a10-mbus.yaml b/Documentation/devicetree/bindings/arm/sunxi/allwinner,sun4i-a10-mbus.yaml
> index e713a6fe4cf7..c1fb404d2fb3 100644
> --- a/Documentation/devicetree/bindings/arm/sunxi/allwinner,sun4i-a10-mbus.yaml
> +++ b/Documentation/devicetree/bindings/arm/sunxi/allwinner,sun4i-a10-mbus.yaml
> @@ -33,10 +33,33 @@ properties:
>        - allwinner,sun50i-a64-mbus
>  
>    reg:
> -    maxItems: 1
> +    minItems: 1
> +    items:
> +      - description: MBUS interconnect/bandwidth/PMU registers
> +      - description: DRAM controller/PHY registers
> +
> +  reg-names:
> +    items:
> +      - const: "mbus"
> +      - const: "dram"
>  
>    clocks:
> +    minItems: 1
> +    items:
> +      - description: MBUS interconnect module clock
> +      - description: DRAM controller/PHY module clock
> +      - description: Register bus clock, shared by MBUS and DRAM
> +
> +  clock-names:
> +    items:
> +      - const: "mbus"
> +      - const: "dram"
> +      - const: "bus"
> +
> +  interrupts:
>      maxItems: 1
> +    description:
> +      MBUS PMU activity interrupt.
>  
>    dma-ranges:
>      description:
> @@ -53,13 +76,42 @@ required:
>    - clocks
>    - dma-ranges
>  
> +if:
> +  properties:
> +    compatible:
> +      contains:
> +        enum:
> +          - allwinner,sun8i-h3-mbus
> +          - allwinner,sun50i-a64-mbus
> +
> +then:
> +  properties:
> +    reg:
> +      minItems: 2
> +
> +    clocks:
> +      minItems: 3
> +
> +  required:
> +    - reg-names
> +    - clock-names
> +
> +else:
> +  properties:
> +    reg:
> +      maxItems: 1
> +
> +    clocks:
> +      maxItems: 1
> +
>  additionalProperties: false
>  
>  examples:
>    - |
> -    #include <dt-bindings/clock/sun5i-ccu.h>
> +    #include <dt-bindings/clock/sun50i-a64-ccu.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
>  
> -    mbus: dram-controller@...1000 {
> +    dram-controller@...1000 {
>          compatible = "allwinner,sun5i-a13-mbus";
>          reg = <0x01c01000 0x1000>;
>          clocks = <&ccu CLK_MBUS>;
> @@ -69,4 +121,21 @@ examples:
>          #interconnect-cells = <1>;
>      };
>  
> +  - |
> +    dram-controller@...2000 {
> +        compatible = "allwinner,sun50i-a64-mbus";
> +        reg = <0x01c62000 0x1000>,
> +              <0x01c63000 0x1000>;
> +        reg-names = "mbus", "dram";
> +        clocks = <&ccu CLK_MBUS>,
> +                 <&ccu CLK_DRAM>,
> +                 <&ccu CLK_BUS_DRAM>;
> +        clock-names = "mbus", "dram", "bus";
> +        interrupts = <GIC_SPI 69 IRQ_TYPE_LEVEL_HIGH>;
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        dma-ranges = <0x00000000 0x40000000 0xc0000000>;
> +        #interconnect-cells = <1>;
> +    };
> +
>  ...
> 

Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics