[PATCH v3] dt-bindings: i2c: Move i2c-omap.txt to YAML format

[Vignesh Raghavendra]

Convert i2c-omap.txt to YAML schema for better checks and documentation.

Following properties were used in DT but were not documented in txt
bindings and has been included in YAML schema:
1. Include ti,am4372-i2c compatible
2. Document clocks property

Signed-off-by: Vignesh Raghavendra <vigneshr at ti.com>
---

Note that am335x-myirtech*.dtsi needs fixing to drop scl/sda-gpios
which are not supported by i2c-omap driver.
omap2/3 dmas property is being dropped by:
https://lore.kernel.org/20210526094424.27234-1-vigneshr@ti.com

v3:
Add conditions around ti,hwmods usage
drop dmas property as it was never used/supported
set additionalProperties: False
Address Rob H comments

v2:
Fix issues with make dt_bindings_check
Add description on usage of ti,hwmods

v2: https://lore.kernel.org/r/20210506140026.31254-1-vigneshr@ti.com
v1: https://lore.kernel.org/r/20210505065511.918-1-vigneshr@ti.com

 .../devicetree/bindings/i2c/i2c-omap.txt      |  37 -------
 .../devicetree/bindings/i2c/ti,omap4-i2c.yaml | 102 ++++++++++++++++++
 MAINTAINERS                                   |   2 +-
 3 files changed, 103 insertions(+), 38 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/i2c/i2c-omap.txt
 create mode 100644 Documentation/devicetree/bindings/i2c/ti,omap4-i2c.yaml

diff --git a/Documentation/devicetree/bindings/i2c/i2c-omap.txt b/Documentation/devicetree/bindings/i2c/i2c-omap.txt
deleted file mode 100644
index a425b91af48f..000000000000
--- a/Documentation/devicetree/bindings/i2c/i2c-omap.txt
+++ /dev/null
@@ -1,37 +0,0 @@
-I2C for OMAP platforms
-
-Required properties :
-- compatible : Must be
-	"ti,omap2420-i2c" for OMAP2420 SoCs
-	"ti,omap2430-i2c" for OMAP2430 SoCs
-	"ti,omap3-i2c" for OMAP3 SoCs
-	"ti,omap4-i2c" for OMAP4+ SoCs
-	"ti,am654-i2c", "ti,omap4-i2c" for AM654 SoCs
-	"ti,j721e-i2c", "ti,omap4-i2c" for J721E SoCs
-	"ti,am64-i2c", "ti,omap4-i2c" for AM64 SoCs
-- ti,hwmods : Must be "i2c<n>", n being the instance number (1-based)
-- #address-cells = <1>;
-- #size-cells = <0>;
-
-Recommended properties :
-- clock-frequency : Desired I2C bus clock frequency in Hz. Otherwise
-  the default 100 kHz frequency will be used.
-
-Optional properties:
-- Child nodes conforming to i2c bus binding
-
-Note: Current implementation will fetch base address, irq and dma
-from omap hwmod data base during device registration.
-Future plan is to migrate hwmod data base contents into device tree
-blob so that, all the required data will be used from device tree dts
-file.
-
-Examples :
-
-i2c1: i2c at 0 {
-    compatible = "ti,omap3-i2c";
-    #address-cells = <1>;
-    #size-cells = <0>;
-    ti,hwmods = "i2c1";
-    clock-frequency = <400000>;
-};
diff --git a/Documentation/devicetree/bindings/i2c/ti,omap4-i2c.yaml b/Documentation/devicetree/bindings/i2c/ti,omap4-i2c.yaml
new file mode 100644
index 000000000000..ff165ad1bee8
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/ti,omap4-i2c.yaml
@@ -0,0 +1,102 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/ti,omap4-i2c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Bindings for I2C controllers on TI's OMAP and K3 SoCs
+
+maintainers:
+  - Vignesh Raghavendra <vigneshr at ti.com>
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - ti,omap2420-i2c
+          - ti,omap2430-i2c
+          - ti,omap3-i2c
+          - ti,omap4-i2c
+      - items:
+          - enum:
+              - ti,am4372-i2c
+              - ti,am64-i2c
+              - ti,am654-i2c
+              - ti,j721e-i2c
+          - const: ti,omap4-i2c
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: fck
+
+  clock-frequency: true
+
+  power-domains: true
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  ti,hwmods:
+    description:
+      Must be "i2c<n>", n being the instance number (1-based).
+      This property is applicable only on legacy platforms mainly omap2/3
+      and ti81xx and should not be used on other platforms.
+    $ref: /schemas/types.yaml#/definitions/string
+    deprecated: true
+
+# subnode's properties
+patternProperties:
+  "@[0-9a-f]+$":
+    type: object
+    description:
+      Flash device uses the below defined properties in the subnode.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+if:
+  properties:
+    compatible:
+      oneOf:
+        - const: ti,omap2420-i2c
+        - const: ti,omap2430-i2c
+        - const: ti,omap3-i2c
+        - const: ti,omap4-i2c
+
+then:
+  properties:
+    ti,hwmods:
+      items:
+        - pattern: "^i2c([1-9])$"
+
+else:
+  properties:
+    ti,hwmods: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    main_i2c0: i2c at 2000000 {
+            compatible = "ti,j721e-i2c", "ti,omap4-i2c";
+            reg = <0x2000000 0x100>;
+            interrupts = <GIC_SPI 200 IRQ_TYPE_LEVEL_HIGH>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+         };
diff --git a/MAINTAINERS b/MAINTAINERS
index 710203d794d7..33625bb83b21 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13424,7 +13424,7 @@ M:	Vignesh R <vigneshr at ti.com>
 L:	linux-omap at vger.kernel.org
 L:	linux-i2c at vger.kernel.org
 S:	Maintained
-F:	Documentation/devicetree/bindings/i2c/i2c-omap.txt
+F:	Documentation/devicetree/bindings/i2c/ti,omap4-i2c.yaml
 F:	drivers/i2c/busses/i2c-omap.c
 
 OMAP IMAGING SUBSYSTEM (OMAP3 ISP and OMAP4 ISS)
-- 
2.31.1