From patchwork Fri Jun 16 13:59:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomi Valkeinen X-Patchwork-Id: 13282809 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 83A56C0015E for ; Fri, 16 Jun 2023 14:00:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344435AbjFPOAN (ORCPT ); Fri, 16 Jun 2023 10:00:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51072 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241049AbjFPOAL (ORCPT ); Fri, 16 Jun 2023 10:00:11 -0400 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 017E53592; Fri, 16 Jun 2023 07:00:09 -0700 (PDT) Received: from desky.lan (91-154-35-171.elisa-laajakaista.fi [91.154.35.171]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 476D5D51; Fri, 16 Jun 2023 15:59:34 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1686923976; bh=BFIupWS4CVXEqMxoTUIQ4cTSs9SkNGSf7BOw6gildpE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pF2O0kca9l8tuNGLwfMQXRQLe3TJkn7rrajGHouRa7VqOWchqzm/CYvFYD594ooXd 15cN3pxpdnKHTDGq+ZUV9lBy4tT+4vKhg9dbgsMIO1G/rRrXJwwSy4G4sOvqCpRI4p Yx6WJdo/itle2T4q2MqkOoRDj2fax+0g08sJUxno= From: Tomi Valkeinen To: linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org, Luca Ceresoli , Andy Shevchenko , Matti Vaittinen , Laurent Pinchart , Sakari Ailus Cc: Wolfram Sang , Rob Herring , Krzysztof Kozlowski , Mauro Carvalho Chehab , Peter Rosin , Liam Girdwood , Mark Brown , Michael Tretter , Hans Verkuil , Mike Pagano , =?utf-8?q?Krzysztof_Ha=C5=82asa?= , Marek Vasut , Satish Nagireddy , Tomi Valkeinen , Rob Herring Subject: [PATCH v14 01/18] dt-bindings: i2c: Add I2C Address Translator (ATR) Date: Fri, 16 Jun 2023 16:59:05 +0300 Message-Id: <20230616135922.442979-2-tomi.valkeinen@ideasonboard.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230616135922.442979-1-tomi.valkeinen@ideasonboard.com> References: <20230616135922.442979-1-tomi.valkeinen@ideasonboard.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org 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 Acked-by: Wolfram Sang Reviewed-by: Rob Herring --- .../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..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 + +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 +...