[PATCH v1 2/6] dt-bindings: i2c: convert ocores binding to yaml
mail at conchuod.ie
mail at conchuod.ie
Sun Jun 5 06:32:57 PDT 2022
From: Conor Dooley <conor.dooley at microchip.com>
Convert the open cores i2c controller binding from text to yaml.
Signed-off-by: Conor Dooley <conor.dooley at microchip.com>
---
.../devicetree/bindings/i2c/i2c-ocores.txt | 78 -----------
.../devicetree/bindings/i2c/i2c-ocores.yaml | 132 ++++++++++++++++++
2 files changed, 132 insertions(+), 78 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/i2c/i2c-ocores.txt
create mode 100644 Documentation/devicetree/bindings/i2c/i2c-ocores.yaml
diff --git a/Documentation/devicetree/bindings/i2c/i2c-ocores.txt b/Documentation/devicetree/bindings/i2c/i2c-ocores.txt
deleted file mode 100644
index a37c9455b244..000000000000
--- a/Documentation/devicetree/bindings/i2c/i2c-ocores.txt
+++ /dev/null
@@ -1,78 +0,0 @@
-Device tree configuration for i2c-ocores
-
-Required properties:
-- compatible : "opencores,i2c-ocores"
- "aeroflexgaisler,i2cmst"
- "sifive,fu540-c000-i2c", "sifive,i2c0"
- For Opencore based I2C IP block reimplemented in
- FU540-C000 SoC.
- "sifive,fu740-c000-i2c", "sifive,i2c0"
- For Opencore based I2C IP block reimplemented in
- FU740-C000 SoC.
- Please refer to sifive-blocks-ip-versioning.txt for
- additional details.
-- reg : bus address start and address range size of device
-- clocks : handle to the controller clock; see the note below.
- Mutually exclusive with opencores,ip-clock-frequency
-- opencores,ip-clock-frequency: frequency of the controller clock in Hz;
- see the note below. Mutually exclusive with clocks
-- #address-cells : should be <1>
-- #size-cells : should be <0>
-
-Optional properties:
-- interrupts : interrupt number.
-- clock-frequency : frequency of bus clock in Hz; see the note below.
- Defaults to 100 KHz when the property is not specified
-- reg-shift : device register offsets are shifted by this value
-- reg-io-width : io register width in bytes (1, 2 or 4)
-- regstep : deprecated, use reg-shift above
-
-Note
-clock-frequency property is meant to control the bus frequency for i2c bus
-drivers, but it was incorrectly used to specify i2c controller input clock
-frequency. So the following rules are set to fix this situation:
-- if clock-frequency is present and neither opencores,ip-clock-frequency nor
- clocks are, then clock-frequency specifies i2c controller clock frequency.
- This is to keep backwards compatibility with setups using old DTB. i2c bus
- frequency is fixed at 100 KHz.
-- if clocks is present it specifies i2c controller clock. clock-frequency
- property specifies i2c bus frequency.
-- if opencores,ip-clock-frequency is present it specifies i2c controller
- clock frequency. clock-frequency property specifies i2c bus frequency.
-
-Examples:
-
- i2c0: ocores at a0000000 {
- #address-cells = <1>;
- #size-cells = <0>;
- compatible = "opencores,i2c-ocores";
- reg = <0xa0000000 0x8>;
- interrupts = <10>;
- opencores,ip-clock-frequency = <20000000>;
-
- reg-shift = <0>; /* 8 bit registers */
- reg-io-width = <1>; /* 8 bit read/write */
-
- dummy at 60 {
- compatible = "dummy";
- reg = <0x60>;
- };
- };
-or
- i2c0: ocores at a0000000 {
- #address-cells = <1>;
- #size-cells = <0>;
- compatible = "opencores,i2c-ocores";
- reg = <0xa0000000 0x8>;
- interrupts = <10>;
- clocks = <&osc>;
- clock-frequency = <400000>; /* i2c bus frequency 400 KHz */
-
- reg-shift = <0>; /* 8 bit registers */
- reg-io-width = <1>; /* 8 bit read/write */
-
- dummy at 60 {
- compatible = "dummy";
- reg = <0x60>;
- };
- };
diff --git a/Documentation/devicetree/bindings/i2c/i2c-ocores.yaml b/Documentation/devicetree/bindings/i2c/i2c-ocores.yaml
new file mode 100644
index 000000000000..1693ffffbe31
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-ocores.yaml
@@ -0,0 +1,132 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/i2c-ocores.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: OpenCores I2C controller
+
+maintainers:
+ - Peter Korsgaard <peter at korsgaard.com>
+ - Andrew Lunn <andrew at lunn.ch>
+
+allOf:
+ - $ref: /schemas/i2c/i2c-controller.yaml#
+
+properties:
+ compatible:
+ oneOf:
+ - items:
+ - enum:
+ - sifive,fu740-c000-i2c # Opencore based IP block FU740-C000 SoC
+ - sifive,fu540-c000-i2c # Opencore based IP block FU540-C000 SoC
+ - const: sifive,i2c0
+ - const: opencores,i2c-ocores
+ - const: aeroflexgaisler,i2cmst
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ clocks:
+ maxItems: 1
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 0
+
+ clock-frequency:
+ description: |
+ Desired I2C bus clock frequency in Hz. As only Standard and Fast
+ modes are supported, possible values are 100000 and 400000.
+ Note:
+ clock-frequency property is meant to control the bus frequency for i2c bus
+ drivers, but it was incorrectly used to specify i2c controller input clock
+ frequency. So the following rules are set to fix this situation:
+ - if clock-frequency is present and neither opencores,ip-clock-frequency nor
+ clocks are, then clock-frequency specifies i2c controller clock frequency.
+ This is to keep backwards compatibility with setups using old DTB. i2c bus
+ frequency is fixed at 100 KHz.
+ - if clocks is present it specifies i2c controller clock. clock-frequency
+ property specifies i2c bus frequency.
+ - if opencores,ip-clock-frequency is present it specifies i2c controller
+ clock frequency. clock-frequency property specifies i2c bus frequency.
+ default: 100000
+
+ reg-io-width:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ io register width in bytes
+ enum: [1, 2, 4]
+
+ reg-shift:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ device register offsets are shifted by this value
+
+ regstep:
+ description: |
+ deprecated, use reg-shift above
+ deprecated: true
+
+ opencores,ip-clock-frequency:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Frequency of the controller clock in Hz. Mutually exclusive with clocks.
+ See the note above.
+
+required:
+ - compatible
+ - reg
+ - "#address-cells"
+ - "#size-cells"
+
+oneOf:
+ - required:
+ - opencores,ip-clock-frequency
+ - required:
+ - clocks
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ i2c at a0000000 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "opencores,i2c-ocores";
+ reg = <0xa0000000 0x8>;
+ interrupts = <10>;
+ opencores,ip-clock-frequency = <20000000>;
+
+ reg-shift = <0>; /* 8 bit registers */
+ reg-io-width = <1>; /* 8 bit read/write */
+
+ dummy at 60 {
+ compatible = "dummy";
+ reg = <0x60>;
+ };
+ };
+
+ i2c at b0000000 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "opencores,i2c-ocores";
+ reg = <0xa0000000 0x8>;
+ interrupts = <10>;
+ clocks = <&osc>;
+ clock-frequency = <400000>; /* i2c bus frequency 400 KHz */
+
+ reg-shift = <0>; /* 8 bit registers */
+ reg-io-width = <1>; /* 8 bit read/write */
+
+ dummy at 60 {
+ compatible = "dummy";
+ reg = <0x60>;
+ };
+ };
+...
--
2.36.1
More information about the linux-riscv
mailing list