[PATCH v9 3/6] dt-bindings: display: imx: Add i.MX8qxp/qm DPR channel binding

[Liu Ying]

This patch adds bindings for i.MX8qxp/qm Display Prefetch Resolve Channel.

Signed-off-by: Liu Ying <victor.liu at nxp.com>
---
v8->v9:
* Reference 'interrupts-extended' schema instead of 'interrupts' to require
  an additional interrupt(r_rtram_stall) because the reference manual does
  mention it, though the driver doesn't get/use it for now.
  Reference 'interrupt-names' schema to define the two interrupt names -
  'dpr_wrap' and 'r_rtram_stall'.
* Drop Rob's R-b tag, as review is needed.

v7->v8:
* No change.

v6->v7:
* No change.

v5->v6:
* No change.

v4->v5:
* No change.

v3->v4:
* Improve compatible property by using enum instead of oneOf+const. (Rob)
* Add Rob's R-b tag.

v2->v3:
* No change.

v1->v2:
* Use new dt binding way to add clocks in the example.

 .../bindings/display/imx/fsl,imx8qxp-dprc.yaml     | 100 +++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dprc.yaml

diff --git a/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dprc.yaml b/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dprc.yaml
new file mode 100644
index 00000000..bd94254
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dprc.yaml
@@ -0,0 +1,100 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/imx/fsl,imx8qxp-dprc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale i.MX8qm/qxp Display Prefetch Resolve Channel
+
+maintainers:
+  - Liu Ying <victor.liu at nxp.com>
+
+description: |
+  The i.MX8qm/qxp Display Prefetch Resolve Channel(DPRC) is an engine which
+  fetches display data before the display pipeline needs the data to drive
+  pixels in the active display region.  This data is transformed, or resolved,
+  from a variety of tiled buffer formats into linear format, if needed.
+  The DPR works with a double bank memory structure.  This memory structure is
+  implemented in the Resolve Tile Memory(RTRAM) and the banks are referred to
+  as A and B.  Each bank is either 4 or 8 lines high depending on the source
+  frame buffer format.
+
+properties:
+  compatible:
+    enum:
+      - fsl,imx8qxp-dpr-channel
+      - fsl,imx8qm-dpr-channel
+
+  reg:
+    maxItems: 1
+
+  interrupts-extended:
+    items:
+      - description: DPR wrap interrupt
+      - description: |
+          'r_rtram_stall' interrupt which indicates relevant i.MX8qm/qxp
+          Prefetch Resolve Gasket(PRG) or PRGs are forcing an underflow
+          condition in the RTRAM.
+
+  interrupt-names:
+    items:
+      - const: dpr_wrap
+      - const: r_rtram_stall
+
+  clocks:
+    items:
+      - description: apb clock
+      - description: b clock
+      - description: rtram clock
+
+  clock-names:
+    items:
+      - const: apb
+      - const: b
+      - const: rtram
+
+  fsl,sc-resource:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: The SCU resource ID associated with this DPRC instance.
+
+  fsl,prgs:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: |
+      List of phandle which points to PRG or PRGs associated with
+      this DPRC instance.
+
+  power-domains:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts-extended
+  - interrupt-names
+  - clocks
+  - clock-names
+  - fsl,sc-resource
+  - fsl,prgs
+  - power-domains
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx8-lpcg.h>
+    #include <dt-bindings/firmware/imx/rsrc.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    dpr-channel at 56100000 {
+        compatible = "fsl,imx8qxp-dpr-channel";
+        reg = <0x56100000 0x10000>;
+        interrupts-extended = <&gic GIC_SPI 51 IRQ_TYPE_LEVEL_HIGH>,
+                              <&dc0_irqsteer 324>;
+        interrupt-names = "dpr_wrap", "r_rtram_stall";
+        clocks = <&dc0_dpr1_lpcg IMX_LPCG_CLK_4>,
+                 <&dc0_dpr1_lpcg IMX_LPCG_CLK_5>,
+                 <&dc0_rtram1_lpcg IMX_LPCG_CLK_0>;
+        clock-names = "apb", "b", "rtram";
+        fsl,sc-resource = <IMX_SC_R_DC_0_VIDEO0>;
+        fsl,prgs = <&dc0_prg4>, <&dc0_prg5>;
+        power-domains = <&pd IMX_SC_R_DC_0>;
+    };
-- 
2.7.4