dt-bindings: memory: convert Samsung Exynos DMC to dtschema

Convert Samsung Exynos5422 SoC frequency and voltage scaling for
Dynamic Memory Controller to DT schema format using json-schema.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Acked-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://lore.kernel.org/r/20210820150353.161161-3-krzysztof.kozlowski@canonical.com
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/memory-controllers/samsung,exynos5422-dmc.yaml

@@ -0,0 +1,137 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/samsung,exynos5422-dmc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: |
+  Samsung Exynos5422 SoC frequency and voltage scaling for Dynamic Memory
+  Controller device
+
+maintainers:
+  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
+  - Lukasz Luba <lukasz.luba@arm.com>
+
+description: |
+  The Samsung Exynos5422 SoC has DMC (Dynamic Memory Controller) to which the
+  DRAM memory chips are connected. The driver is to monitor the controller in
+  runtime and switch frequency and voltage. To monitor the usage of the
+  controller in runtime, the driver uses the PPMU (Platform Performance
+  Monitoring Unit), which is able to measure the current load of the memory.
+  When 'userspace' governor is used for the driver, an application is able to
+  switch the DMC and memory frequency.
+
+properties:
+  compatible:
+    items:
+      - const: samsung,exynos5422-dmc
+
+  clock-names:
+    items:
+      - const: fout_spll
+      - const: mout_sclk_spll
+      - const: ff_dout_spll2
+      - const: fout_bpll
+      - const: mout_bpll
+      - const: sclk_bpll
+      - const: mout_mx_mspll_ccore
+      - const: mout_mclk_cdrex
+
+  clocks:
+    minItems: 8
+    maxItems: 8
+
+  devfreq-events:
+    $ref: '/schemas/types.yaml#/definitions/phandle-array'
+    minItems: 1
+    maxItems: 16
+    description: phandles of the PPMU events used by the controller.
+
+  device-handle:
+    $ref: '/schemas/types.yaml#/definitions/phandle'
+    description: |
+      phandle of the connected DRAM memory device. For more information please
+      refer to documentation file: Documentation/devicetree/bindings/ddr/lpddr3.txt
+
+  operating-points-v2: true
+
+  interrupts:
+    items:
+      - description: DMC internal performance event counters in DREX0
+      - description: DMC internal performance event counters in DREX1
+
+  interrupt-names:
+    items:
+      - const: drex_0
+      - const: drex_1
+
+  reg:
+    items:
+      - description: registers of DREX0
+      - description: registers of DREX1
+
+  samsung,syscon-clk:
+    $ref: '/schemas/types.yaml#/definitions/phandle'
+    description: |
+      Phandle of the clock register set used by the controller, these registers
+      are used for enabling a 'pause' feature and are not exposed by clock
+      framework but they must be used in a safe way.  The register offsets are
+      in the driver code and specyfic for this SoC type.
+
+  vdd-supply: true
+
+required:
+  - compatible
+  - clock-names
+  - clocks
+  - devfreq-events
+  - device-handle
+  - reg
+  - samsung,syscon-clk
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/exynos5420.h>
+    ppmu_dmc0_0: ppmu@10d00000 {
+        compatible = "samsung,exynos-ppmu";
+        reg = <0x10d00000 0x2000>;
+        clocks = <&clock CLK_PCLK_PPMU_DREX0_0>;
+        clock-names = "ppmu";
+        events {
+            ppmu_event_dmc0_0: ppmu-event3-dmc0-0 {
+                event-name = "ppmu-event3-dmc0_0";
+            };
+        };
+    };
+
+    memory-controller@10c20000 {
+        compatible = "samsung,exynos5422-dmc";
+        reg = <0x10c20000 0x10000>, <0x10c30000 0x10000>;
+        clocks = <&clock CLK_FOUT_SPLL>,
+                 <&clock CLK_MOUT_SCLK_SPLL>,
+                 <&clock CLK_FF_DOUT_SPLL2>,
+                 <&clock CLK_FOUT_BPLL>,
+                 <&clock CLK_MOUT_BPLL>,
+                 <&clock CLK_SCLK_BPLL>,
+                 <&clock CLK_MOUT_MX_MSPLL_CCORE>,
+                 <&clock CLK_MOUT_MCLK_CDREX>;
+        clock-names = "fout_spll",
+                      "mout_sclk_spll",
+                      "ff_dout_spll2",
+                      "fout_bpll",
+                      "mout_bpll",
+                      "sclk_bpll",
+                      "mout_mx_mspll_ccore",
+                      "mout_mclk_cdrex";
+        operating-points-v2 = <&dmc_opp_table>;
+        devfreq-events = <&ppmu_event3_dmc0_0>,	<&ppmu_event3_dmc0_1>,
+                         <&ppmu_event3_dmc1_0>, <&ppmu_event3_dmc1_1>;
+        device-handle = <&samsung_K3QF2F20DB>;
+        vdd-supply = <&buck1_reg>;
+        samsung,syscon-clk = <&clock>;
+        interrupt-parent = <&combiner>;
+        interrupts = <16 0>, <16 1>;
+        interrupt-names = "drex_0", "drex_1";
+    };

MAINTAINERS

@@ -5569,7 +5569,7 @@ M:	Lukasz Luba <lukasz.luba@arm.com>
 L:	linux-pm@vger.kernel.org
 L:	linux-samsung-soc@vger.kernel.org
 S:	Maintained
-F:	Documentation/devicetree/bindings/memory-controllers/exynos5422-dmc.txt
+F:	Documentation/devicetree/bindings/memory-controllers/samsung,exynos5422-dmc.yaml
 F:	drivers/memory/samsung/exynos5422-dmc.c
 
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