linux-kernel - [PATCH 1/2] dt-bindings: i2c: Convert UniPhier I2C controller to json-schema

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Date:   Fri, 21 Feb 2020 11:55:33 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] dt-bindings: i2c: Convert UniPhier I2C controller to json-schema

Convert the UniPhier I2C controller (FIFO-less) binding to DT schema
format.

There are two types of I2C controllers used on the UniPhier platform.
This is the legacy one without FIFO support, which is used on the
sLD8 SoC or older.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

When I search for a subsystem-common schema, I need to
look in both dt-schema project and the kernel tree.

For example,
the i2c-controller.yaml is located in the dt-schema project.
dt-schema/schemas/i2c/i2c-controller.yaml

The dma-controller.yaml is located in the kernel tree.
Documentation/devicetree/bindings/dma/dma-controller.yaml

I am still wondering about the policy...

As far as I understood, the schema written by Rob
tend to go in the dt-schma project. Is this correct?


 .../devicetree/bindings/i2c/i2c-uniphier.txt  | 25 ----------
 .../bindings/i2c/socionext,uniphier-i2c.yaml  | 50 +++++++++++++++++++
 2 files changed, 50 insertions(+), 25 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/i2c/i2c-uniphier.txt
 create mode 100644 Documentation/devicetree/bindings/i2c/socionext,uniphier-i2c.yaml

diff --git a/Documentation/devicetree/bindings/i2c/i2c-uniphier.txt b/Documentation/devicetree/bindings/i2c/i2c-uniphier.txt
deleted file mode 100644
index 26f9d95b3436..000000000000
--- a/Documentation/devicetree/bindings/i2c/i2c-uniphier.txt
+++ /dev/null
@@ -1,25 +0,0 @@
-UniPhier I2C controller (FIFO-less)
-
-Required properties:
-- compatible: should be "socionext,uniphier-i2c".
-- #address-cells: should be 1.
-- #size-cells: should be 0.
-- reg: offset and length of the register set for the device.
-- interrupts: a single interrupt specifier.
-- clocks: phandle to the input clock.
-
-Optional properties:
-- clock-frequency: desired I2C bus frequency in Hz.  The maximum supported
-  value is 400000.  Defaults to 100000 if not specified.
-
-Examples:
-
-	i2c0: i2c@...00000 {
-		compatible = "socionext,uniphier-i2c";
-		reg = <0x58400000 0x40>;
-		#address-cells = <1>;
-		#size-cells = <0>;
-		interrupts = <0 41 1>;
-		clocks = <&i2c_clk>;
-		clock-frequency = <100000>;
-	};
diff --git a/Documentation/devicetree/bindings/i2c/socionext,uniphier-i2c.yaml b/Documentation/devicetree/bindings/i2c/socionext,uniphier-i2c.yaml
new file mode 100644
index 000000000000..ef998def554e
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/socionext,uniphier-i2c.yaml
@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/socionext,uniphier-i2c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: UniPhier I2C controller (FIFO-less)
+
+maintainers:
+  - Masahiro Yamada <yamada.masahiro@...ionext.com>
+
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+
+properties:
+  compatible:
+    const: socionext,uniphier-i2c
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-frequency:
+    minimum: 100000
+    maximum: 400000
+
+required:
+  - compatible
+  - reg
+  - "#address-cells"
+  - "#size-cells"
+  - interrupts
+  - clocks
+
+examples:
+  - |
+    i2c0: i2c@...00000 {
+        compatible = "socionext,uniphier-i2c";
+        reg = <0x58400000 0x40>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        interrupts = <0 41 1>;
+        clocks = <&i2c_clk>;
+        clock-frequency = <100000>;
+    };
-- 
2.17.1