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Date: Thu, 20 Oct 2022 21:10:06 -0500
From: Rob Herring <robh@...nel.org>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.co>,
Albert Ou <aou@...s.berkeley.edu>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Magnus Damm <magnus.damm@...il.com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Heiko Stuebner <heiko@...ech.de>,
Conor Dooley <conor.dooley@...rochip.com>,
Guo Ren <guoren@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Nathan Chancellor <nathan@...nel.org>,
Atish Patra <atishp@...osinc.com>,
Anup Patel <anup@...infault.org>,
Andrew Jones <ajones@...tanamicro.com>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-riscv@...ts.infradead.org, linux-renesas-soc@...r.kernel.org,
Biju Das <biju.das.jz@...renesas.com>,
Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [RFC PATCH v3 1/2] dt-bindings: cache: r9a07g043f-l2-cache: Add
DT binding documentation for L2 cache controller
On Wed, Oct 19, 2022 at 11:02:41PM +0100, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> Add DT binding documentation for L2 cache controller found on RZ/Five SoC.
>
> The Renesas RZ/Five microprocessor includes a RISC-V CPU Core (AX45MP
> Single) from Andes. The AX45MP core has an L2 cache controller, this patch
> describes the L2 cache block.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
> .../cache/andestech,ax45mp-cache.yaml | 125 ++++++++++++++++++
> .../cache/andestech,ax45mp-cache.h | 38 ++++++
> 2 files changed, 163 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/cache/andestech,ax45mp-cache.yaml
> create mode 100644 include/dt-bindings/cache/andestech,ax45mp-cache.h
>
> diff --git a/Documentation/devicetree/bindings/cache/andestech,ax45mp-cache.yaml b/Documentation/devicetree/bindings/cache/andestech,ax45mp-cache.yaml
> new file mode 100644
> index 000000000000..4c86a15bda5f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/cache/andestech,ax45mp-cache.yaml
> @@ -0,0 +1,125 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright (C) 2022 Renesas Electronics Corp.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/cache/andestech,ax45mp-cache.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Andestech AX45MP L2 Cache Controller
> +
> +maintainers:
> + - Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> +
> +description:
> + A level-2 cache (L2C) is used to improve the system performance by providing
> + a larger amount of cache line entries and reasonable access delays. The L2C
> + is shared between cores, and a non-inclusive non-exclusive policy is used.
> +
> +select:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - andestech,ax45mp-cache
> +
> + required:
> + - compatible
> +
> +properties:
> + compatible:
> + items:
> + - const: andestech,ax45mp-cache
> + - const: cache
> +
> + reg:
> + maxItems: 1
> +
> + interrupts:
> + maxItems: 1
> +
> + cache-line-size:
> + const: 64
> +
> + cache-level:
> + const: 2
> +
> + cache-sets:
> + const: 1024
> +
> + cache-size:
> + enum: [131072, 262144, 524288, 1048576, 2097152]
> +
> + cache-unified: true
> +
> + next-level-cache: true
> +
> + andestech,pma-regions:
> + $ref: /schemas/types.yaml#/definitions/uint32-matrix
> + minItems: 1
> + maxItems: 16
What is the inner dimension of the matrix?
items:
minItems: ?
maxItems: ?
> + description: Optional array of memory regions to be set as non-cacheable
> + bufferable regions which will be setup in the PMA.
> +
> + andestech,inst-prefetch:
> + description: Instruction prefetch depth
> + $ref: /schemas/types.yaml#/definitions/uint32
> + enum: [ 0, 1, 2, 3 ]
> +
> + andestech,data-prefetch:
> + description: Data prefetch depth
> + $ref: /schemas/types.yaml#/definitions/uint32
> + enum: [ 0, 1, 2, 3 ]
> +
> + andestech,tag-ram-ctl:
> + description: Tag RAM output cycle. First tuple indicates output cycle and the
> + second tuple indicates setup cycle.
> + $ref: /schemas/types.yaml#/definitions/uint8-array
> + items:
> + - minimum: 0
> + maximum: 2
> + - minimum: 0
> + maximum: 2
maxItems: 2
items:
maximum: 2
'items' without the '-' applies to all items.
And the minimum is already 0.
> +
> + andestech,data-ram-ctl:
> + description: Data RAM output cycle. First tuple indicates output cycle and the
> + second tuple indicates setup cycle.
> + $ref: /schemas/types.yaml#/definitions/uint8-array
> + items:
> + - minimum: 0
> + maximum: 2
> + - minimum: 0
> + maximum: 2
Same here.
> +
> +additionalProperties: false
> +
> +required:
> + - compatible
> + - cache-line-size
> + - cache-level
> + - cache-sets
> + - cache-size
> + - cache-unified
> + - interrupts
> + - reg
> +
> +examples:
> + - |
> + #include <dt-bindings/interrupt-controller/irq.h>
> + #include <dt-bindings/cache/andestech,ax45mp-cache.h>
> +
> + cache-controller@...0000 {
> + reg = <0x13400000 0x100000>;
> + compatible = "andestech,ax45mp-cache", "cache";
> + interrupts = <508 IRQ_TYPE_LEVEL_HIGH>;
> + cache-line-size = <64>;
> + cache-level = <2>;
> + cache-sets = <1024>;
> + cache-size = <262144>;
> + cache-unified;
> + andestech,pma-regions = <0x58000000 0x08000000
> + (AX45MP_PMACFG_ETYP_NAPOT | AX45MP_PMACFG_MTYP_MEM_NON_CACHE_BUF)>;
> + andestech,inst-prefetch = <0x3>;
> + andestech,data-prefetch = <0x3>;
> + andestech,tag-ram-ctl = /bits/ 8 <0x1 0x0>;
> + andestech,data-ram-ctl = /bits/ 8 <0x1 0x0>;
> + };
> diff --git a/include/dt-bindings/cache/andestech,ax45mp-cache.h b/include/dt-bindings/cache/andestech,ax45mp-cache.h
> new file mode 100644
> index 000000000000..aa1cad24075d
> --- /dev/null
> +++ b/include/dt-bindings/cache/andestech,ax45mp-cache.h
> @@ -0,0 +1,38 @@
> +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
> +/*
> + * This header provides constants for Andes AX45MP PMA configuration
> + *
> + * Copyright (C) 2022 Renesas Electronics Corp.
> + */
> +
> +#ifndef __DT_BINDINGS_ANDESTECH_AX45MP_CACHE_H
> +#define __DT_BINDINGS_ANDESTECH_AX45MP_CACHE_H
> +
> +/* OFF: PMA entry is disabled */
> +#define AX45MP_PMACFG_ETYP_DISABLED 0
> +/* Naturally aligned power of 2 region */
> +#define AX45MP_PMACFG_ETYP_NAPOT 3
> +
> +/* Device, Non-bufferable */
> +#define AX45MP_PMACFG_MTYP_DEV_NON_BUF (0 << 2)
> +/* Device, bufferable */
> +#define AX45MP_PMACFG_MTYP_DEV_BUF (1 << 2)
> +/* Memory, Non-cacheable, Non-bufferable */
> +#define AX45MP_PMACFG_MTYP_MEM_NON_CACHE_NON_BUF (2 << 2)
> +/* Memory, Non-cacheable, Bufferable */
> +#define AX45MP_PMACFG_MTYP_MEM_NON_CACHE_BUF (3 << 2)
> +/* Memory, Write-back, No-allocate */
> +#define AX45MP_PMACFG_MTYP_MEM_WB_NA (8 << 2)
> +/* Memory, Write-back, Read-allocate */
> +#define AX45MP_PMACFG_MTYP_MEM_WB_RA (9 << 2)
> +/* Memory, Write-back, Write-allocate */
> +#define AX45MP_PMACFG_MTYP_MEM_WB_WA (10 << 2)
> +/* Memory, Write-back, Read and Write-allocate */
> +#define AX45MP_PMACFG_MTYP_MEM_WB_R_WA (11 << 2)
> +
> +/* AMO instructions are supported */
> +#define AX45MP_PMACFG_NAMO_AMO_SUPPORT (0 << 6)
> +/* AMO instructions are not supported */
> +#define AX45MP_PMACFG_NAMO_AMO_NO_SUPPORT (1 << 6)
> +
> +#endif /* __DT_BINDINGS_ANDESTECH_AX45MP_CACHE_H */
> --
> 2.25.1
>
>
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