linux-kernel - [PATCH v12 1/8] dt-bindings: i2c: Add I2C Address Translator (ATR)

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Message-Id: <20230425072601.51031-2-tomi.valkeinen@ideasonboard.com>
Date:   Tue, 25 Apr 2023 10:25:54 +0300
From:   Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Wolfram Sang <wsa@...nel.org>,
        Luca Ceresoli <luca.ceresoli@...tlin.com>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Matti Vaittinen <Matti.Vaittinen@...rohmeurope.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Peter Rosin <peda@...ntia.se>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Michael Tretter <m.tretter@...gutronix.de>,
        Hans Verkuil <hverkuil@...all.nl>,
        Mike Pagano <mpagano@...too.org>,
        Krzysztof Hałasa <khalasa@...p.pl>,
        Marek Vasut <marex@...x.de>,
        Satish Nagireddy <satish.nagireddy@...cruise.com>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: [PATCH v12 1/8] dt-bindings: i2c: Add I2C Address Translator (ATR)

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@...asonboard.com>
Acked-by: Wolfram Sang <wsa@...nel.org>
---
 .../devicetree/bindings/i2c/i2c-atr.yaml      | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/i2c-atr.yaml

diff --git a/Documentation/devicetree/bindings/i2c/i2c-atr.yaml b/Documentation/devicetree/bindings/i2c/i2c-atr.yaml
new file mode 100644
index 000000000000..470cc6c9af35
--- /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@...asonboard.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/uint16-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
+...
-- 
2.34.1