linux-kernel - [PATCH v2 1/4] dt-bindings: memory: Add LPDDR2 binding

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Date:   Sun,  3 Oct 2021 03:35:06 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: [PATCH v2 1/4] dt-bindings: memory: Add LPDDR2 binding

Add binding for standard LPDDR2 memory chip properties.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 .../memory-controllers/jedec,lpddr2.yaml      | 80 +++++++++++++++++++
 include/dt-bindings/memory/lpddr2.h           | 25 ++++++
 2 files changed, 105 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/memory-controllers/jedec,lpddr2.yaml
 create mode 100644 include/dt-bindings/memory/lpddr2.h

diff --git a/Documentation/devicetree/bindings/memory-controllers/jedec,lpddr2.yaml b/Documentation/devicetree/bindings/memory-controllers/jedec,lpddr2.yaml
new file mode 100644
index 000000000000..ef227eba1e4a
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/jedec,lpddr2.yaml
@@ -0,0 +1,80 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/jedec,lpddr2.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: JEDEC LPDDR2 SDRAM
+
+maintainers:
+  - Krzysztof Kozlowski <krzk@...nel.org>
+
+properties:
+  jedec,lpddr2-manufacturer-id:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    maximum: 255
+    description: |
+      Unique manufacturer ID of SDRAM chip. See MR5 description in JESD209-2.
+
+  jedec,lpddr2-revision-id1:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    maximum: 255
+    description: |
+      Revision 1 value of SDRAM chip.
+      See MR6 description in chip vendor specification.
+
+  jedec,lpddr2-revision-id2:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    maximum: 255
+    description: |
+      Revision 2 value of SDRAM chip.
+      See MR7 description in chip vendor specification.
+
+  jedec,lpddr2-density-mbits:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      Density in megabits of SDRAM chip. See MR8 description in JESD209-2.
+    enum:
+      - 64
+      - 128
+      - 256
+      - 512
+      - 1024
+      - 2048
+      - 4096
+      - 8192
+      - 16384
+      - 32768
+
+  jedec,lpddr2-io-width-bits:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      IO bus width in bits of SDRAM chip. See MR8 description in JESD209-2.
+    enum:
+      - 32
+      - 16
+      - 8
+
+  jedec,lpddr2-type:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      LPDDR type which corresponds to a number of words SDRAM pre-fetches
+      per column request. See MR8 description in JESD209-2.
+    enum:
+      - 0 # S4 (4 words prefetch architecture)
+      - 1 # S2 (2 words prefetch architecture)
+      - 2 # NVM (Non-volatile memory)
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/memory/lpddr2.h>
+
+    lpddr2 {
+        jedec,lpddr2-manufacturer-id = <LPDDR2_MANID_ELPIDA>;
+        jedec,lpddr2-revision-id1 = <1>;
+        jedec,lpddr2-density-mbits = <2048>;
+        jedec,lpddr2-io-width-bits = <16>;
+        jedec,lpddr2-type = <LPDDR2_TYPE_S4>;
+    };
diff --git a/include/dt-bindings/memory/lpddr2.h b/include/dt-bindings/memory/lpddr2.h
new file mode 100644
index 000000000000..e837b0d8a11e
--- /dev/null
+++ b/include/dt-bindings/memory/lpddr2.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause */
+#ifndef _DT_BINDINGS_LPDDR2_H
+#define _DT_BINDINGS_LPDDR2_H
+
+#define LPDDR2_MANID_SAMSUNG		1
+#define LPDDR2_MANID_QIMONDA		2
+#define LPDDR2_MANID_ELPIDA		3
+#define LPDDR2_MANID_ETRON		4
+#define LPDDR2_MANID_NANYA		5
+#define LPDDR2_MANID_HYNIX		6
+#define LPDDR2_MANID_MOSEL		7
+#define LPDDR2_MANID_WINBOND		8
+#define LPDDR2_MANID_ESMT		9
+#define LPDDR2_MANID_SPANSION		11
+#define LPDDR2_MANID_SST		12
+#define LPDDR2_MANID_ZMOS		13
+#define LPDDR2_MANID_INTEL		14
+#define LPDDR2_MANID_NUMONYX		254
+#define LPDDR2_MANID_MICRON		255
+
+#define LPDDR2_TYPE_S4			0
+#define LPDDR2_TYPE_S2			1
+#define LPDDR2_TYPE_NVM			2
+
+#endif /*_DT_BINDINGS_LPDDR2_H */
-- 
2.32.0