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        Albert Ou <aou@eecs.berkeley.edu>,
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        Prabhakar <prabhakar.csengg@gmail.com>,
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Subject: [RFC PATCH v3 1/2] dt-bindings: cache: r9a07g043f-l2-cache: Add DT binding documentation for L2 cache controller
Date:   Wed, 19 Oct 2022 23:02:41 +0100
Message-Id: <20221019220242.4746-2-prabhakar.mahadev-lad.rj@bp.renesas.com>
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From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.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@bp.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@bp.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
+    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
+
+  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
+
+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@2010000 {
+        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