[PATCH v2 01/11] dt-bindings: i2c: Add Apple I2C controller bindings

Sven Peter
2021-10-08T16:36:26Z

The Apple I2C controller is based on the PASemi I2C controller.
It is present on Apple SoCs such as the M1.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
---
v1 -> v2: no changes

.../devicetree/bindings/i2c/apple,i2c.yaml | 61 +++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 62 insertions(+)
create mode 100644 Documentation/devicetree/bindings/i2c/apple,i2c.yaml

diff --git a/Documentation/devicetree/bindings/i2c/apple,i2c.yaml b/Documentation/devicetree/bindings/i2c/apple,i2c.yaml
new file mode 100644
index 000000000000..22fc8483256f
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/apple,i2c.yaml
@@ -0,0 +1,61 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/i2c/apple,i2c.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Apple/PASemi I2C controller
+
+maintainers:
+ - Sven Peter <sven@svenpeter.dev>
+
+description: |
+ Apple SoCs such as the M1 come with a I2C controller based on the one found
+ in machines with P. A. Semi's PWRficient processors.
+ The bus is used to communicate with e.g. USB PD chips or the speaker
+ amp.
+
+allOf:
+ - $ref: /schemas/i2c/i2c-controller.yaml#
+
+properties:
+ compatible:
+ enum:
+ - apple,t8103-i2c
+ - apple,i2c
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ items:
+ - description: I2C bus reference clock
+
+ interrupts:
+ maxItems: 1
+
+ clock-frequency:
+ description: |
+ Desired I2C bus clock frequency in Hz. If not specified, 100 kHz will be
+ used. This frequency is generated by dividing the reference clock.
+ Allowed values are between ref_clk/(16*4) and ref_clk/(16*255).
+
+required:
+ - compatible
+ - reg
+ - clocks
+ - interrupts
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ i2c@35010000 {
+ compatible = "apple,t8103-i2c";
+ reg = <0x35010000 0x4000>;
+ interrupt-parent = <&aic>;
+ interrupts = <0 627 4>;
+ clocks = <&ref_clk>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 7cfd63ce7122..74aa85967ca3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1735,6 +1735,7 @@ B: https://github.com/AsahiLinux/linux/issues
C: irc://irc.oftc.net/asahi-dev
T: git https://github.com/AsahiLinux/linux.git
F: Documentation/devicetree/bindings/arm/apple.yaml
+F: Documentation/devicetree/bindings/i2c/apple,i2c.yaml
F: Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
F: Documentation/devicetree/bindings/pci/apple,pcie.yaml
F: Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml
--
2.25.1