[PATCH v3 02/13] dt-bindings: memory: Add Baikal-T1 DDRC DT-schema

[Serge Semin <Sergey.Semin@baikalelectronics.ru>]

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.
In addition to that the DFI-DDR PHY CSRs can be accessed via a separate
registers space.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
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";
+    };
+...
-- 
2.37.3