[RFT,v3,03/27] dt-bindings: arm: apple: Add bindings for Apple ARM platforms

Commit Message

Hector Martin March 4, 2021, 9:38 p.m. UTC

This introduces bindings for all three 2020 Apple M1 devices:

* apple,j274 - Mac mini (M1, 2020)
* apple,j293 - MacBook Pro (13-inch, M1, 2020)
* apple,j313 - MacBook Air (M1, 2020)

Signed-off-by: Hector Martin <[e-mail]>
---
 .../devicetree/bindings/arm/apple.yaml        | 64 +++++++++++++++++++
 MAINTAINERS                                   | 10 +++
 2 files changed, 74 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/apple.yaml

Comments

Linus Walleij March 5, 2021, 10:16 a.m. UTC | #1

On Thu, Mar 4, 2021 at 10:39 PM Hector Martin <[e-mail]> wrote:

> This introduces bindings for all three 2020 Apple M1 devices:
>
> * apple,j274 - Mac mini (M1, 2020)
> * apple,j293 - MacBook Pro (13-inch, M1, 2020)
> * apple,j313 - MacBook Air (M1, 2020)
>
> Signed-off-by: Hector Martin <[e-mail]>

This way of specifying the SoC makes sense to me.
Reviewed-by: Linus Walleij <[e-mail]>

Yours,
Linus Walleij

Rob Herring March 8, 2021, 8:27 p.m. UTC | #2

On Fri, 05 Mar 2021 06:38:38 +0900, Hector Martin wrote:
> This introduces bindings for all three 2020 Apple M1 devices:
> 
> * apple,j274 - Mac mini (M1, 2020)
> * apple,j293 - MacBook Pro (13-inch, M1, 2020)
> * apple,j313 - MacBook Air (M1, 2020)
> 
> Signed-off-by: Hector Martin <[e-mail]>
> ---
>  .../devicetree/bindings/arm/apple.yaml        | 64 +++++++++++++++++++
>  MAINTAINERS                                   | 10 +++
>  2 files changed, 74 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/apple.yaml
> 

Reviewed-by: Rob Herring <[e-mail]>

Patch

diff --git a/Documentation/devicetree/bindings/arm/apple.yaml b/Documentation/devicetree/bindings/arm/apple.yaml
new file mode 100644
index 000000000000..1e772c85206c
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/apple.yaml
@@ -0,0 +1,64 @@ 
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/apple.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple ARM Machine Device Tree Bindings
+
+maintainers:
+  - Hector Martin <[e-mail]>
+
+description: |
+  ARM platforms using SoCs designed by Apple Inc., branded "Apple Silicon".
+
+  This currently includes devices based on the "M1" SoC, starting with the
+  three Mac models released in late 2020:
+
+  - Mac mini (M1, 2020)
+  - MacBook Pro (13-inch, M1, 2020)
+  - MacBook Air (M1, 2020)
+
+  The compatible property should follow this format:
+
+  compatible = "apple,<targettype>", "apple,<socid>", "apple,arm-platform";
+
+  <targettype> represents the board/device and comes from the `target-type`
+  property of the root node of the Apple Device Tree, lowercased. It can be
+  queried on macOS using the following command:
+
+  $ ioreg -d2 -l | grep target-type
+
+  <socid> is the lowercased SoC ID. Apple uses at least *five* different
+  names for their SoCs:
+
+  - Marketing name ("M1")
+  - Internal name ("H13G")
+  - Codename ("Tonga")
+  - SoC ID ("T8103")
+  - Package/IC part number ("APL1102")
+
+  Devicetrees should use the lowercased SoC ID, to avoid confusion if
+  multiple SoCs share the same marketing name. This can be obtained from
+  the `compatible` property of the arm-io node of the Apple Device Tree,
+  which can be queried as follows on macOS:
+
+  $ ioreg -n arm-io | grep compatible
+
+properties:
+  $nodename:
+    const: "/"
+  compatible:
+    oneOf:
+      - description: Apple M1 SoC based platforms
+        items:
+          - enum:
+              - apple,j274 # Mac mini (M1, 2020)
+              - apple,j293 # MacBook Pro (13-inch, M1, 2020)
+              - apple,j313 # MacBook Air (M1, 2020)
+          - const: apple,t8103
+          - const: apple,arm-platform
+
+additionalProperties: true
+
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index d92f85ca831d..aec14fbd61b8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1637,6 +1637,16 @@  F:	arch/arm/mach-alpine/
 F:	arch/arm64/boot/dts/amazon/
 F:	drivers/*/*alpine*
 
+ARM/APPLE MACHINE SUPPORT
+M:	Hector Martin <[e-mail]>
+L:	[e-mail] (moderated for non-subscribers)
+S:	Maintained
+W:	https://asahilinux.org
+B:	https://github.com/AsahiLinux/linux/issues
+C:	irc://chat.freenode.net/asahi-dev
+T:	git https://github.com/AsahiLinux/linux.git
+F:	Documentation/devicetree/bindings/arm/apple.yaml
+
 ARM/ARTPEC MACHINE SUPPORT
 M:	Jesper Nilsson <[e-mail]>
 M:	Lars Persson <[e-mail]>