From patchwork Thu Jan 21 10:18:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 12035459 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D57D2C433DB for ; Thu, 21 Jan 2021 10:18:19 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1B9EC221F8 for ; Thu, 21 Jan 2021 10:18:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1B9EC221F8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bootlin.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=VHm1HLS0GuNnmtDhVXykqLxrb/QV061XXCH+p4k8RW4=; b=y1VcUkgbAngMwTBK3+ONLoD/f gfVhFoQy7gFYChujh7V1aN4FWtrfE+FGfFFXp3fZPvg0fOx5udYtMRld0GVWPuVVDkWl57NvILzOL LAt7h/v6I6oPrphVFPaeTyb8MSr7evG8zuNbD1GQwuizggb+fIQQfT2LBjNsk8r8BcyMShlXKixW9 mh43SbwU/cpKyooMDVWkVco0KCJawFT8bXc9m2kalpEY7myUOl7HKCqInoB7lUL9kGlzfZOFv43UB 7nR/GV+Kof59FVA8zywit1M4gUM2jQZLPf5tPj67C5khwWihi8JXBDRSTf9Xec2ytJ1iB0shYUbQK UmhJnCD6w==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l2X2g-0002sp-6Y; Thu, 21 Jan 2021 10:18:18 +0000 Received: from relay7-d.mail.gandi.net ([217.70.183.200]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1l2X2d-0002rT-HY for linux-i3c@lists.infradead.org; Thu, 21 Jan 2021 10:18:17 +0000 X-Originating-IP: 86.201.233.230 Received: from localhost.localdomain (lfbn-tou-1-151-230.w86-201.abo.wanadoo.fr [86.201.233.230]) (Authenticated sender: miquel.raynal@bootlin.com) by relay7-d.mail.gandi.net (Postfix) with ESMTPSA id 21E4920005; Thu, 21 Jan 2021 10:18:13 +0000 (UTC) From: Miquel Raynal To: Alexandre Belloni , linux-i3c@lists.infradead.org, Rob Herring , Subject: [PATCH v5 1/6] dt-bindings: i3c: Convert the bus description to yaml Date: Thu, 21 Jan 2021 11:18:03 +0100 Message-Id: <20210121101808.14654-2-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210121101808.14654-1-miquel.raynal@bootlin.com> References: <20210121101808.14654-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210121_051815_763955_63317E5C X-CRM114-Status: GOOD ( 26.20 ) X-BeenThere: linux-i3c@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Miquel Raynal , Rajeev Huralikoppi , Conor Culhane , Thomas Petazzoni , Nicolas Pitre Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org Attempting a conversion of the i3c.txt file to yaml schema with minimal content changes. Signed-off-by: Miquel Raynal Reviewed-by: Rob Herring --- Documentation/devicetree/bindings/i3c/i3c.txt | 140 -------------- .../devicetree/bindings/i3c/i3c.yaml | 179 ++++++++++++++++++ 2 files changed, 179 insertions(+), 140 deletions(-) delete mode 100644 Documentation/devicetree/bindings/i3c/i3c.txt create mode 100644 Documentation/devicetree/bindings/i3c/i3c.yaml diff --git a/Documentation/devicetree/bindings/i3c/i3c.txt b/Documentation/devicetree/bindings/i3c/i3c.txt deleted file mode 100644 index 4ffe059f0fec..000000000000 --- a/Documentation/devicetree/bindings/i3c/i3c.txt +++ /dev/null @@ -1,140 +0,0 @@ -Generic device tree bindings for I3C busses -=========================================== - -This document describes generic bindings that should be used to describe I3C -busses in a device tree. - -Required properties -------------------- - -- #address-cells - should be <3>. Read more about addresses below. -- #size-cells - should be <0>. -- compatible - name of the I3C master controller driving the I3C bus - -For other required properties e.g. to describe register sets, -clocks, etc. check the binding documentation of the specific driver. -The node describing an I3C bus should be named i3c-master. - -Optional properties -------------------- - -These properties may not be supported by all I3C master drivers. Each I3C -master bindings should specify which of them are supported. - -- i3c-scl-hz: frequency of the SCL signal used for I3C transfers. - When undefined the core sets it to 12.5MHz. - -- i2c-scl-hz: frequency of the SCL signal used for I2C transfers. - When undefined, the core looks at LVR (Legacy Virtual Register) - values of I2C devices described in the device tree to determine - the maximum I2C frequency. - -I2C devices -=========== - -Each I2C device connected to the bus should be described in a subnode. All -properties described in Documentation/devicetree/bindings/i2c/i2c.txt are -valid here, but several new properties have been added. - -New constraint on existing properties: --------------------------------------- -- reg: contains 3 cells - + first cell : still encoding the I2C address. 10 bit addressing is not - supported. Devices with 10 bit address can't be properly passed through - DEFSLVS command. - - + second cell: shall be 0 - - + third cell: shall encode the I3C LVR (Legacy Virtual Register) - bit[31:8]: unused/ignored - bit[7:5]: I2C device index. Possible values - * 0: I2C device has a 50 ns spike filter - * 1: I2C device does not have a 50 ns spike filter but supports high - frequency on SCL - * 2: I2C device does not have a 50 ns spike filter and is not tolerant - to high frequencies - * 3-7: reserved - - bit[4]: tell whether the device operates in FM (Fast Mode) or FM+ mode - * 0: FM+ mode - * 1: FM mode - - bit[3:0]: device type - * 0-15: reserved - -The I2C node unit-address should always match the first cell of the reg -property: @. - -I3C devices -=========== - -All I3C devices are supposed to support DAA (Dynamic Address Assignment), and -are thus discoverable. So, by default, I3C devices do not have to be described -in the device tree. -This being said, one might want to attach extra resources to these devices, -and those resources may have to be described in the device tree, which in turn -means we have to describe I3C devices. - -Another use case for describing an I3C device in the device tree is when this -I3C device has a static I2C address and we want to assign it a specific I3C -dynamic address before the DAA takes place (so that other devices on the bus -can't take this dynamic address). - -The I3C device should be names @,, -where device-type is describing the type of device connected on the bus -(gpio-controller, sensor, ...). - -Required properties -------------------- -- reg: contains 3 cells - + first cell : encodes the static I2C address. Should be 0 if the device does - not have one (0 is not a valid I2C address). - - + second and third cells: should encode the ProvisionalID. The second cell - contains the manufacturer ID left-shifted by 1. - The third cell contains ORing of the part ID - left-shifted by 16, the instance ID left-shifted - by 12 and the extra information. This encoding is - following the PID definition provided by the I3C - specification. - -Optional properties -------------------- -- assigned-address: dynamic address to be assigned to this device. This - property is only valid if the I3C device has a static - address (first cell of the reg property != 0). - - -Example: - - i3c-master@d040000 { - compatible = "cdns,i3c-master"; - clocks = <&coreclock>, <&i3csysclock>; - clock-names = "pclk", "sysclk"; - interrupts = <3 0>; - reg = <0x0d040000 0x1000>; - #address-cells = <3>; - #size-cells = <0>; - i2c-scl-hz = <100000>; - - /* I2C device. */ - nunchuk: nunchuk@52 { - compatible = "nintendo,nunchuk"; - reg = <0x52 0x0 0x10>; - }; - - /* I3C device with a static I2C address. */ - thermal_sensor: sensor@68,39200144004 { - reg = <0x68 0x392 0x144004>; - assigned-address = <0xa>; - }; - - /* - * I3C device without a static I2C address but requiring - * resources described in the DT. - */ - sensor@0,39200154004 { - reg = <0x0 0x392 0x154004>; - clocks = <&clock_provider 0>; - }; - }; diff --git a/Documentation/devicetree/bindings/i3c/i3c.yaml b/Documentation/devicetree/bindings/i3c/i3c.yaml new file mode 100644 index 000000000000..52042aa44d19 --- /dev/null +++ b/Documentation/devicetree/bindings/i3c/i3c.yaml @@ -0,0 +1,179 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/i3c/i3c.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: I3C bus binding + +maintainers: + - Alexandre Belloni + - Miquel Raynal + +description: | + I3C busses can be described with a node for the primary I3C controller device + and a set of child nodes for each I2C or I3C slave on the bus. Each of them + may, during the life of the bus, request mastership. + +properties: + $nodename: + pattern: "^i3c-master@[0-9a-f]+$" + + "#address-cells": + const: 3 + description: | + Each I2C device connected to the bus should be described in a subnode. + + All I3C devices are supposed to support DAA (Dynamic Address Assignment), + and are thus discoverable. So, by default, I3C devices do not have to be + described in the device tree. This being said, one might want to attach + extra resources to these devices, and those resources may have to be + described in the device tree, which in turn means we have to describe + I3C devices. + + Another use case for describing an I3C device in the device tree is when + this I3C device has a static I2C address and we want to assign it a + specific I3C dynamic address before the DAA takes place (so that other + devices on the bus can't take this dynamic address). + + "#size-cells": + const: 0 + + i3c-scl-hz: + description: | + Frequency of the SCL signal used for I3C transfers. When undefined, the + default value should be 12.5MHz. + + May not be supported by all controllers. + + i2c-scl-hz: + description: | + Frequency of the SCL signal used for I2C transfers. When undefined, the + default should be to look at LVR (Legacy Virtual Register) values of + I2C devices described in the device tree to determine the maximum I2C + frequency. + + May not be supported by all controllers. + +required: + - "#address-cells" + - "#size-cells" + +patternProperties: + "@[0-9a-f]+$": + type: object + description: | + I2C child, should be named: @ + + All properties described in Documentation/devicetree/bindings/i2c/i2c.txt + are valid here, except the reg property whose content is changed. + + properties: + compatible: + description: + Compatible of the I2C device. + + reg: + items: + - items: + - description: | + I2C address. 10 bit addressing is not supported. Devices with + 10-bit address can't be properly passed through DEFSLVS + command. + minimum: 0 + maximum: 0x7f + - const: 0 + - description: | + Shall encode the I3C LVR (Legacy Virtual Register): + bit[31:8]: unused/ignored + bit[7:5]: I2C device index. Possible values: + * 0: I2C device has a 50 ns spike filter + * 1: I2C device does not have a 50 ns spike filter but + supports high frequency on SCL + * 2: I2C device does not have a 50 ns spike filter and is + not tolerant to high frequencies + * 3-7: reserved + bit[4]: tell whether the device operates in FM (Fast Mode) + or FM+ mode: + * 0: FM+ mode + * 1: FM mode + bit[3:0]: device type + * 0-15: reserved + + required: + - compatible + - reg + + "@[0-9a-f]+,[0-9a-f]+$": + type: object + description: | + I3C child, should be named: @, + + properties: + reg: + items: + - items: + - description: | + Encodes the static I2C address. Should be 0 if the device does + not have one (0 is not a valid I2C address). + minimum: 0 + maximum: 0x7f + - description: | + First half of the Provisional ID (following the PID + definition provided by the I3C specification). + + Contains the manufacturer ID left-shifted by 1. + - description: | + Second half of the Provisional ID (following the PID + definition provided by the I3C specification). + + Contains the ORing of the part ID left-shifted by 16, + the instance ID left-shifted by 12 and extra information. + + assigned-address: + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0x1 + maximum: 0xff + description: | + Dynamic address to be assigned to this device. This property is only + valid if the I3C device has a static address (first cell of the reg + property != 0). + + required: + - reg + +additionalProperties: true + +examples: + - | + i3c-master@d040000 { + compatible = "cdns,i3c-master"; + clocks = <&coreclock>, <&i3csysclock>; + clock-names = "pclk", "sysclk"; + interrupts = <3 0>; + reg = <0x0d040000 0x1000>; + #address-cells = <3>; + #size-cells = <0>; + i2c-scl-hz = <100000>; + + /* I2C device. */ + nunchuk: nunchuk@52 { + compatible = "nintendo,nunchuk"; + reg = <0x52 0x0 0x10>; + }; + + /* I3C device with a static I2C address. */ + thermal_sensor: sensor@68,39200144004 { + reg = <0x68 0x392 0x144004>; + assigned-address = <0xa>; + }; + + /* + * I3C device without a static I2C address but requiring + * resources described in the DT. + */ + sensor@0,39200154004 { + reg = <0x0 0x392 0x154004>; + clocks = <&clock_provider 0>; + }; + };