linux-kernel - Re: [PATCH v3 1/2] dt-bindings: perf: Support uncore NI-700 PMU

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Date: Wed, 6 Mar 2024 15:46:13 -0600
From: Rob Herring <robh@...nel.org>
To: "JiaLong.Yang" <jialong.yang@...ngroup.cn>
Cc: Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, shenghui.qu@...ngroup.cn,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: perf: Support uncore NI-700 PMU

On Wed, Mar 06, 2024 at 02:16:02PM +0800, JiaLong.Yang wrote:
> Add file corresponding to hx_arm_ni.c introducing ARM NI-700 PMU
> driver for HX.
> 
> Signed-off-by: JiaLong.Yang <jialong.yang@...ngroup.cn>
> ---
> v1 --> v2:
> 1. Submit dt-bindings file Seperately.
> 2. Do some check:
>    ~ #: make dt_binding_check DT_SCHEMA_FILES=perf
>    LINT    Documentation/devicetree/bindings
>    CHKDT   Documentation/devicetree/bindings/processed-schema.json
>    SCHEMA  Documentation/devicetree/bindings/processed-schema.json
>    DTEX    Documentation/devicetree/bindings/perf/hx,c2000-arm-ni.example.dts
>    DTC_CHK Documentation/devicetree/bindings/perf/hx,c2000-arm-ni.example.dtb
> 
> v2 --> v3:
> 1. Change vendor from hx to hexin.
> 2. Submit driver and dt-bindings files together.
> 3. Delete pccs-id property. Use alias-id to do this.
> 4. There are at least one interrupt line for the hardware and driver
>    for handling counter overflow.
> 5. Use 4 spaces for example indentation in yaml file.
> 
>  .../bindings/perf/hexin,c2000-arm-ni.yaml     | 51 +++++++++++++++++++
>  MAINTAINERS                                   |  6 +++
>  2 files changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/perf/hexin,c2000-arm-ni.yaml
> 
> diff --git a/Documentation/devicetree/bindings/perf/hexin,c2000-arm-ni.yaml b/Documentation/devicetree/bindings/perf/hexin,c2000-arm-ni.yaml
> new file mode 100644
> index 000000000000..b2641ee84d60
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/perf/hexin,c2000-arm-ni.yaml
> @@ -0,0 +1,51 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/perf/hexin,c2000-arm-ni.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: HX-C2000 NI (Network-on-chip Interconnect) Performance Monitors
> +
> +maintainers:
> +  - Jialong Yang <jialong.yang@...ngroup.cn>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - hexin,c2000-arm-ni

As this seems to be Arm IP, I'd expect arm,ni-700-pmu or something.

Are there Hexin modifications to it?

> +
> +  reg:
> +    items:
> +      - description: Physical address of the base (PERIPHBASE) and
> +          size of the whole NI configuration address space.

Just 'maxItems: 1' if there is only 1 entry.

> +
> +  interrupts:
> +    minItems: 1
> +    items:
> +      - description: Overflow interrupt for clock domain 0
> +      - description: Overflow interrupt for clock domain 1
> +      - description: Overflow interrupt for clock domain 2
> +      - description: Generally, one interrupt line for one PMU. But this also
> +          support one interrupt line for a NI if merged.

I don't understand this last entry.

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    aliases {
> +        ni-pmu0 = &nipmu0;

Drop. Please don't make up your own alias names.

> +    };
> +
> +    nipmu0: pmu@...f0000 {
> +        compatible = "hexin,c2000-arm-ni";
> +        reg = <0x2b420000 0x10000>;
> +        interrupts = <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>;
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 4f298c4187fb..4b664cec98a7 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -18890,6 +18890,12 @@ L:	linux-riscv@...ts.infradead.org
>  S:	Maintained
>  F:	arch/riscv/boot/dts/thead/
>  
> +HX ARM-NI-700 PMU DRIVERS
> +M:	Jialong Yang <jialong.yang@...ngroup.cn>
> +S:	Supported
> +F:	Documentation/devicetree/bindings/perf/hexin,c2000-arm-ni.yaml
> +F:	drivers/perf/hx_arm_ni.c
> +
>  RNBD BLOCK DRIVERS
>  M:	Md. Haris Iqbal <haris.iqbal@...os.com>
>  M:	Jack Wang <jinpu.wang@...os.com>
> -- 
> 2.25.1
>