linux-kernel - [PATCH v2 1/2] RISC-V: Add DT documentation for SiFive L2 Cache Controller

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Date:   Thu,  2 May 2019 16:04:52 +0530
From:   Yash Shah <yash.shah@...ive.com>
To:     linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        palmer@...ive.com
Cc:     paul.walmsley@...ive.com, linux-kernel@...r.kernel.org,
        aou@...s.berkeley.edu, mark.rutland@....com, robh+dt@...nel.org,
        sachin.ghadi@...ive.com, Yash Shah <yash.shah@...ive.com>
Subject: [PATCH v2 1/2] RISC-V: Add DT documentation for SiFive L2 Cache Controller

Add device tree bindings for SiFive FU540 L2 cache controller driver

Signed-off-by: Yash Shah <yash.shah@...ive.com>
---
 .../devicetree/bindings/riscv/sifive-l2-cache.txt  | 51 ++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/riscv/sifive-l2-cache.txt

diff --git a/Documentation/devicetree/bindings/riscv/sifive-l2-cache.txt b/Documentation/devicetree/bindings/riscv/sifive-l2-cache.txt
new file mode 100644
index 0000000..73d8f19
--- /dev/null
+++ b/Documentation/devicetree/bindings/riscv/sifive-l2-cache.txt
@@ -0,0 +1,51 @@
+SiFive L2 Cache Controller
+--------------------------
+The SiFive Level 2 Cache Controller is used to provide access to fast copies
+of memory for masters in a Core Complex. The Level 2 Cache Controller also
+acts as directory-based coherency manager.
+All the properties in ePAPR/DeviceTree specification applies for this platform
+
+Required Properties:
+--------------------
+- compatible: Should be "sifive,fu540-c000-ccache" and "cache"
+
+- cache-block-size: Specifies the block size in bytes of the cache.
+  Should be 64
+
+- cache-level: Should be set to 2 for a level 2 cache
+
+- cache-sets: Specifies the number of associativity sets of the cache.
+  Should be 1024
+
+- cache-size: Specifies the size in bytes of the cache. Should be 2097152
+
+- cache-unified: Specifies the cache is a unified cache
+
+- interrupts: Must contain 3 entries (DirError, DataError and DataFail signals)
+
+- reg: Physical base address and size of L2 cache controller registers map
+
+Optional Properties:
+--------------------
+- next-level-cache: phandle to the next level cache if present.
+
+- memory-region: reference to the reserved-memory for the L2 Loosely Integrated
+  Memory region. The reserved memory node should be defined as per the bindings
+  in reserved-memory.txt
+
+
+Example:
+
+	cache-controller@...0000 {
+		compatible = "sifive,fu540-c000-ccache", "cache";
+		cache-block-size = <64>;
+		cache-level = <2>;
+		cache-sets = <1024>;
+		cache-size = <2097152>;
+		cache-unified;
+		interrupt-parent = <&plic0>;
+		interrupts = <1 2 3>;
+		reg = <0x0 0x2010000 0x0 0x1000>;
+		next-level-cache = <&L25 &L40 &L36>;
+		memory-region = <&l2_lim>;
+	};
-- 
1.9.1