[PATCH 2/2] dt-bindings: spi: ti,davinci-spi: convert to DT schema

[Bhargav Joshi <j.bhargav.u@gmail.com>]

Convert the TI DaVinci/Keystone SPI controller binding from text format
to DT schema.

Changes during the conversion:
- Create a separate ti,davinci-spi-peripheral-props.yaml schema to
  properly define the ti,spi-wdelay peripheral property.
- Add missing dmas and dma-names properties.
- Add constraints to ti,spi-wdelay based on the 6-bit width
  of the SPIFMTn.WDELAY hardware register field.
- Add constraints to num-cs based on the maximum hardware chip
  selects available on the DA850 SoC.

Signed-off-by: Bhargav Joshi <j.bhargav.u@gmail.com>
---
 .../devicetree/bindings/spi/spi-davinci.txt        | 100 -----------------
 .../bindings/spi/spi-peripheral-props.yaml         |   1 +
 .../spi/ti,davinci-spi-peripheral-props.yaml       |  25 +++++
 .../devicetree/bindings/spi/ti,davinci-spi.yaml    | 118 +++++++++++++++++++++
 4 files changed, 144 insertions(+), 100 deletions(-)

diff --git a/Documentation/devicetree/bindings/spi/spi-davinci.txt b/Documentation/devicetree/bindings/spi/spi-davinci.txt
deleted file mode 100644
index f012888656ec..000000000000
--- a/Documentation/devicetree/bindings/spi/spi-davinci.txt
+++ /dev/null
@@ -1,100 +0,0 @@
-Davinci SPI controller device bindings
-
-Links on DM:
-Keystone 2 - https://www.ti.com/lit/ug/sprugp2a/sprugp2a.pdf
-dm644x - https://www.ti.com/lit/ug/sprue32a/sprue32a.pdf
-OMAP-L138/da830 - http://www.ti.com/lit/ug/spruh77a/spruh77a.pdf
-
-Required properties:
-- #address-cells: number of cells required to define a chip select
-	address on the SPI bus. Should be set to 1.
-- #size-cells: should be zero.
-- compatible:
-	- "ti,dm6441-spi" for SPI used similar to that on DM644x SoC family
-	- "ti,da830-spi" for SPI used similar to that on DA8xx SoC family
-	- "ti,keystone-spi" for SPI used similar to that on Keystone2 SoC
-		family
-- reg: Offset and length of SPI controller register space
-- num-cs: Number of chip selects. This includes internal as well as
-	GPIO chip selects.
-- ti,davinci-spi-intr-line: interrupt line used to connect the SPI
-	IP to the interrupt controller within the SoC. Possible values
-	are 0 and 1. Manual says one of the two possible interrupt
-	lines can be tied to the interrupt controller. Set this
-	based on a specific SoC configuration.
-- interrupts: interrupt number mapped to CPU.
-- clocks: spi clk phandle
-          For 66AK2G this property should be set per binding,
-          Documentation/devicetree/bindings/clock/ti,sci-clk.yaml
-
-SoC-specific Required Properties:
-
-The following are mandatory properties for Keystone 2 66AK2G SoCs only:
-
-- power-domains:	Should contain a phandle to a PM domain provider node
-			and an args specifier containing the SPI device id
-			value. This property is as per the binding,
-
-Optional:
-- cs-gpios: gpio chip selects
-	For example to have 3 internal CS and 2 GPIO CS, user could define
-	cs-gpios = <0>, <0>, <0>, <&gpio1 30 0>, <&gpio1 31 0>;
-	where first three are internal CS and last two are GPIO CS.
-
-Optional properties for slave devices:
-SPI slave nodes can contain the following properties.
-Not all SPI Peripherals from Texas Instruments support this.
-Please check SPI peripheral documentation for a device before using these.
-
-- ti,spi-wdelay : delay between transmission of words
-	(SPIFMTn.WDELAY, SPIDAT1.WDEL) must be specified in number of SPI module
-	clock periods.
-
-	delay = WDELAY * SPI_module_clock_period + 2 * SPI_module_clock_period
-
-Below is timing diagram which shows functional meaning of
-"ti,spi-wdelay" parameter.
-
-             +-+ +-+ +-+ +-+ +-+                           +-+ +-+ +-+
-SPI_CLK      | | | | | | | | | |                           | | | | | |
-  +----------+ +-+ +-+ +-+ +-+ +---------------------------+ +-+ +-+ +-
-
-SPI_SOMI/SIMO+-----------------+                           +-----------
-  +----------+ word1           +---------------------------+word2
-             +-----------------+                           +-----------
-                                          WDELAY
-                                <-------------------------->
-
-Example of a NOR flash slave device (n25q032) connected to DaVinci
-SPI controller device over the SPI bus.
-
-spi0:spi@20bf0000 {
-	#address-cells			= <1>;
-	#size-cells			= <0>;
-	compatible			= "ti,dm6446-spi";
-	reg				= <0x20BF0000 0x1000>;
-	num-cs				= <4>;
-	ti,davinci-spi-intr-line	= <0>;
-	interrupts			= <338>;
-	clocks				= <&clkspi>;
-
-	flash: flash@0 {
-		#address-cells = <1>;
-		#size-cells = <1>;
-		compatible = "st,m25p32";
-		spi-max-frequency = <25000000>;
-		reg = <0>;
-		ti,spi-wdelay = <8>;
-
-		partition@0 {
-			label = "u-boot-spl";
-			reg = <0x0 0x80000>;
-			read-only;
-		};
-
-		partition@1 {
-			label = "test";
-			reg = <0x80000 0x380000>;
-		};
-	};
-};
diff --git a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
index 880a9f624566..cb5d608998e1 100644
--- a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
+++ b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
@@ -155,5 +155,6 @@ allOf:
   - $ref: fsl,dspi-peripheral-props.yaml#
   - $ref: samsung,spi-peripheral-props.yaml#
   - $ref: nvidia,tegra210-quad-peripheral-props.yaml#
+  - $ref: ti,davinci-spi-peripheral-props.yaml#
 
 additionalProperties: true
diff --git a/Documentation/devicetree/bindings/spi/ti,davinci-spi-peripheral-props.yaml b/Documentation/devicetree/bindings/spi/ti,davinci-spi-peripheral-props.yaml
new file mode 100644
index 000000000000..1060f176c6cb
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/ti,davinci-spi-peripheral-props.yaml
@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/ti,davinci-spi-peripheral-props.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI DaVinci/Keystone SPI Peripheral Properties
+
+maintainers:
+  - Bartosz Golaszewski <brgl@kernel.org>
+
+description:
+  Peripheral-specific properties for SPI devices attached to a TI
+  DaVinci/Keystone SPI controller.
+
+properties:
+  ti,spi-wdelay:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 63
+    description:
+      delay between transmission of words (SPIFMTn.WDELAY, SPIDAT1.WDEL)
+      must be specified in number of SPI module clock periods.
+
+additionalProperties: true
diff --git a/Documentation/devicetree/bindings/spi/ti,davinci-spi.yaml b/Documentation/devicetree/bindings/spi/ti,davinci-spi.yaml
new file mode 100644
index 000000000000..81014e963909
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/ti,davinci-spi.yaml
@@ -0,0 +1,118 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/ti,davinci-spi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI DaVinci/Keystone SPI Controller
+
+maintainers:
+  - Bartosz Golaszewski <brgl@kernel.org>
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - ti,da830-spi
+          - ti,keystone-spi
+      - items:
+          - const: ti,keystone-spi
+          - const: ti,dm6441-spi
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+    description:
+      Should contain a phandle to a PM domain provider node
+      and an args specifier containing the SPI device id
+      value.
+
+  num-cs:
+    minimum: 1
+    maximum: 6
+    default: 1
+    description:
+      Number of chip selects supported by the controller. This
+      includes both internal and GPIO chip selects.
+
+  ti,davinci-spi-intr-line:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1]
+    description:
+      Interrupt line used to connect the SPI IP to the interrupt
+      controller within the SoC.  The SPI peripheral can route its
+      interrupt output to one of two lines (INT0 or INT1). Set
+      this based on the SoC-specific wiring to the interrupt
+      controller.
+
+  dmas:
+    items:
+      - description: RX DMA channel
+      - description: TX DMA channel
+
+  dma-names:
+    items:
+      - const: rx
+      - const: tx
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - ti,davinci-spi-intr-line
+
+allOf:
+  - $ref: spi-controller.yaml#
+  - if:
+      properties:
+        compatible:
+          const: ti,keystone-spi
+    then:
+      required:
+        - power-domains
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi@20bf0000 {
+        compatible = "ti,keystone-spi","ti,dm6441-spi";
+        reg = <0x20bf0000 0x1000>;
+        num-cs = <4>;
+        ti,davinci-spi-intr-line = <0>;
+        interrupts = <338>;
+        clocks = <&clkspi>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        flash@0 {
+            compatible = "jedec,spi-nor";
+            spi-max-frequency = <25000000>;
+            reg = <0>;
+            ti,spi-wdelay = <8>;
+        };
+    };
+
+  - |
+    spi@41000 {
+        compatible = "ti,da830-spi";
+        reg = <0x41000 0x1000>;
+        num-cs = <6>;
+        ti,davinci-spi-intr-line = <1>;
+        interrupts = <20>;
+        dmas = <&edma0 14 0>, <&edma0 15 0>;
+        dma-names = "rx", "tx";
+        clocks = <&psc0 4>;
+        power-domains = <&psc0 4>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+    };

-- 
2.55.0