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[v13,1/8] dt-bindings: i2c: Add I2C Address Translator (ATR)

Message ID 20230426115114.156696-2-tomi.valkeinen@ideasonboard.com
State Superseded
Headers show
Series [v13,1/8] dt-bindings: i2c: Add I2C Address Translator (ATR) | expand

Commit Message

Tomi Valkeinen April 26, 2023, 11:51 a.m. UTC 
Add bindings for I2C Address Translator. Only one property is added,
'i2c-alias-pool', which can be used in the bindings for the device that
supports ATR.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Acked-by: Wolfram Sang <wsa@kernel.org>
---
 .../devicetree/bindings/i2c/i2c-atr.yaml      | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/i2c-atr.yaml

Comments

Rob Herring April 27, 2023, 4:41 p.m. UTC | #1 
On Wed, 26 Apr 2023 14:51:07 +0300, Tomi Valkeinen wrote:
> Add bindings for I2C Address Translator. Only one property is added,
> 'i2c-alias-pool', which can be used in the bindings for the device that
> supports ATR.
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> Acked-by: Wolfram Sang <wsa@kernel.org>
> ---
>  .../devicetree/bindings/i2c/i2c-atr.yaml      | 34 +++++++++++++++++++
>  1 file changed, 34 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/i2c/i2c-atr.yaml
> 

Reviewed-by: Rob Herring <robh@kernel.org>
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Patch

diff --git a/Documentation/devicetree/bindings/i2c/i2c-atr.yaml b/Documentation/devicetree/bindings/i2c/i2c-atr.yaml
new file mode 100644
index 000000000000..1939ab339bfc
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-atr.yaml
@@ -0,0 +1,34 @@ 
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/i2c-atr.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Common i2c address translator properties
+
+maintainers:
+  - Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
+
+description:
+  An I2C Address Translator (ATR) is a device with an I2C slave parent
+  ("upstream") port and N I2C master child ("downstream") ports, and
+  forwards transactions from upstream to the appropriate downstream port
+  with a modified slave address. The address used on the parent bus is
+  called the "alias" and is (potentially) different from the physical
+  slave address of the child bus. Address translation is done by the
+  hardware.
+
+properties:
+  i2c-alias-pool:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description:
+      I2C alias pool is a pool of I2C addresses on the main I2C bus that can be
+      used to access the remote peripherals on the serializer's I2C bus. The
+      addresses must be available, not used by any other peripheral. Each
+      remote peripheral is assigned an alias from the pool, and transactions to
+      that address will be forwarded to the remote peripheral, with the address
+      translated to the remote peripheral's real address. This property is not
+      needed if there are no I2C addressable remote peripherals.
+
+additionalProperties: true
+...