[PATCH v4 02/13] dt-bindings: memory: Add BT1 DDRC DT-schema

[Serge Semin <fancer.lancer@gmail.com>]

Baikal-T1 DDR controller is based on the DW uMCTL2 DDRC IP-core v2.51a
with up to DDR3 protocol capability and 32-bit data bus + 8-bit ECC. There
are individual IRQs for each ECC and DFI events. The dedicated scrubber
clock source is absent since it's fully synchronous to the core clock.

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>

---

Changelog v2:
- Keep the alphabetically ordered compatible strings list. (@Krzysztof)
- Fix grammar nitpicks in the patch log. (@Krzysztof)
- Drop the PHY CSR region. (@Rob)
- Move the device bindings to the separate DT-schema.
---
 .../memory-controllers/baikal,bt1-ddrc.yaml   | 91 +++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/memory-controllers/baikal,bt1-ddrc.yaml

diff --git a/Documentation/devicetree/bindings/memory-controllers/baikal,bt1-ddrc.yaml b/Documentation/devicetree/bindings/memory-controllers/baikal,bt1-ddrc.yaml
new file mode 100644
index 000000000000..80353a0a676f
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/baikal,bt1-ddrc.yaml
@@ -0,0 +1,91 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/baikal,bt1-ddrc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Baikal-T1 DDR Controller
+
+maintainers:
+  - Serge Semin <fancer.lancer@gmail.com>
+
+description:
+  Baikal-T1 DDRC is based on the DW uMCTL2 DDRC IP-core v2.51a with DDR2
+  and DDR3 protocol capability, 32-bit data bus + 8-bit ECC + up to 2
+  SDRAM ranks. There are individual IRQs for each ECC and DFI events.
+  The dedicated scrubber clock source is absent since it's fully
+  synchronous to the core clock.
+
+allOf:
+  - $ref: /schemas/memory-controllers/snps,dw-umctl2-common.yaml#
+
+properties:
+  compatible:
+    const: baikal,bt1-ddrc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 4
+
+  interrupt-names:
+    items:
+      - const: dfi_e
+      - const: ecc_ce
+      - const: ecc_ue
+      - const: ecc_sbr
+
+  clocks:
+    maxItems: 3
+
+  clock-names:
+    items:
+      - const: pclk
+      - const: aclk
+      - const: core
+
+  resets:
+    maxItems: 2
+
+  reset-names:
+    items:
+      - const: arst
+      - const: core
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+  - interrupt-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/mips-gic.h>
+    #include <dt-bindings/clock/bt1-ccu.h>
+    #include <dt-bindings/reset/bt1-ccu.h>
+
+    memory-controller@1f042000 {
+      compatible = "baikal,bt1-ddrc";
+      reg = <0x1f042000 0x1000>;
+
+      interrupts = <GIC_SHARED 96 IRQ_TYPE_LEVEL_HIGH>,
+                   <GIC_SHARED 97 IRQ_TYPE_LEVEL_HIGH>,
+                   <GIC_SHARED 98 IRQ_TYPE_LEVEL_HIGH>,
+                   <GIC_SHARED 99 IRQ_TYPE_LEVEL_HIGH>;
+      interrupt-names = "dfi_e", "ecc_ce", "ecc_ue", "ecc_sbr";
+
+      clocks = <&ccu_sys CCU_SYS_APB_CLK>,
+               <&ccu_axi CCU_AXI_DDR_CLK>,
+               <&ccu_pll CCU_DDR_PLL>;
+      clock-names = "pclk", "aclk", "core";
+
+      resets = <&ccu_axi CCU_AXI_DDR_RST>,
+               <&ccu_sys CCU_SYS_DDR_INIT_RST>;
+      reset-names = "arst", "core";
+    };
+...
-- 
2.41.0