[PATCH v3] spi: dt-bindings: ti,qspi: convert to dtschema

[Kousik Sanagavarapu <five231003@xxxxxxxxx>]

Convert txt binding of TI's qspi controller (found on their omap SoCs) to
dtschema to allow for validation.

The changes, w.r.t. the original txt binding, are:

- Introduce "clocks" and "clock-names" which was never mentioned.
- Reflect that "ti,hwmods" is deprecated and is not a "required"
  property anymore.
- Introduce "num-cs" which allows for setting the number of chip
  selects.
- Drop "qspi_ctrlmod".

Signed-off-by: Kousik Sanagavarapu <five231003@xxxxxxxxx>
---
Changes since v1:
- Removed a redundant paragraph in the commit message.
- Mention that we are dropping "qspi_ctrlmod", which I forgot to do in
  the last iteration.

Changes since v2:
- Don't make "num-cs" an array.
- The max number of syscon-chipselects is now 1.
- Make the unit-address in the example right.
- Fix a typo in "syscon-chipselects"'s description.

 .../devicetree/bindings/spi/ti,qspi.yaml      | 96 +++++++++++++++++++
 .../devicetree/bindings/spi/ti_qspi.txt       | 53 ----------
 2 files changed, 96 insertions(+), 53 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/spi/ti,qspi.yaml
 delete mode 100644 Documentation/devicetree/bindings/spi/ti_qspi.txt

diff --git a/Documentation/devicetree/bindings/spi/ti,qspi.yaml b/Documentation/devicetree/bindings/spi/ti,qspi.yaml
new file mode 100644
index 000000000000..626a915b3d77
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/ti,qspi.yaml
@@ -0,0 +1,96 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/ti,qspi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI QSPI controller
+
+maintainers:
+  - Kousik Sanagavarapu <five231003@xxxxxxxxx>
+
+allOf:
+  - $ref: spi-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - ti,am4372-qspi
+      - ti,dra7xxx-qspi
+
+  reg:
+    items:
+      - description: base registers
+      - description: mapped memory
+
+  reg-names:
+    items:
+      - const: qspi_base
+      - const: qspi_mmap
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: fck
+
+  interrupts:
+    maxItems: 1
+
+  num-cs:
+    minimum: 1
+    maximum: 4
+    default: 1
+
+  ti,hwmods:
+    description:
+      Name of the hwmod associated to the QSPI.  This is for legacy
+      platforms only.
+    $ref: /schemas/types.yaml#/definitions/string
+    deprecated: true
+
+  syscon-chipselects:
+    description:
+      Handle to system control region containing QSPI chipselect register
+      and offset of that register.
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - items:
+          - description: phandle to system control register
+          - description: register offset
+
+  spi-max-frequency:
+    description: Maximum SPI clocking speed of the controller in Hz.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - clocks
+  - clock-names
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/dra7.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    spi@4b300000 {
+        compatible = "ti,dra7xxx-qspi";
+        reg = <0x4b300000 0x100>,
+              <0x5c000000 0x4000000>;
+        reg-names = "qspi_base", "qspi_mmap";
+        syscon-chipselects = <&scm_conf 0x558>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        clocks = <&l4per2_clkctrl DRA7_L4PER2_QSPI_CLKCTRL 25>;
+        clock-names = "fck";
+        num-cs = <4>;
+        spi-max-frequency = <48000000>;
+        interrupts = <GIC_SPI 343 IRQ_TYPE_LEVEL_HIGH>;
+    };
+...
diff --git a/Documentation/devicetree/bindings/spi/ti_qspi.txt b/Documentation/devicetree/bindings/spi/ti_qspi.txt
deleted file mode 100644
index 47b184bce414..000000000000
--- a/Documentation/devicetree/bindings/spi/ti_qspi.txt
+++ /dev/null
@@ -1,53 +0,0 @@
-TI QSPI controller.
-
-Required properties:
-- compatible : should be "ti,dra7xxx-qspi" or "ti,am4372-qspi".
-- reg: Should contain QSPI registers location and length.
-- reg-names: Should contain the resource reg names.
-	- qspi_base: Qspi configuration register Address space
-	- qspi_mmap: Memory mapped Address space
-	- (optional) qspi_ctrlmod: Control module Address space
-- interrupts: should contain the qspi interrupt number.
-- #address-cells, #size-cells : Must be present if the device has sub-nodes
-- ti,hwmods: Name of the hwmod associated to the QSPI
-
-Recommended properties:
-- spi-max-frequency: Definition as per
-                     Documentation/devicetree/bindings/spi/spi-bus.txt
-
-Optional properties:
-- syscon-chipselects: Handle to system control region contains QSPI
-		      chipselect register and offset of that register.
-
-NOTE: TI QSPI controller requires different pinmux and IODelay
-parameters for Mode-0 and Mode-3 operations, which needs to be set up by
-the bootloader (U-Boot). Default configuration only supports Mode-0
-operation. Hence, "spi-cpol" and "spi-cpha" DT properties cannot be
-specified in the slave nodes of TI QSPI controller without appropriate
-modification to bootloader.
-
-Example:
-
-For am4372:
-qspi: qspi@47900000 {
-	compatible = "ti,am4372-qspi";
-	reg = <0x47900000 0x100>, <0x30000000 0x4000000>;
-	reg-names = "qspi_base", "qspi_mmap";
-	#address-cells = <1>;
-	#size-cells = <0>;
-	spi-max-frequency = <25000000>;
-	ti,hwmods = "qspi";
-};
-
-For dra7xx:
-qspi: qspi@4b300000 {
-	compatible = "ti,dra7xxx-qspi";
-	reg = <0x4b300000 0x100>,
-	      <0x5c000000 0x4000000>,
-	reg-names = "qspi_base", "qspi_mmap";
-	syscon-chipselects = <&scm_conf 0x558>;
-	#address-cells = <1>;
-	#size-cells = <0>;
-	spi-max-frequency = <48000000>;
-	ti,hwmods = "qspi";
-};
-- 
2.45.0.rc1.8.ge326e52010