From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 AE72DC43381 for ; Fri, 22 Mar 2019 13:47:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 86CE3218B0 for ; Fri, 22 Mar 2019 13:47:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728539AbfCVNrJ (ORCPT ); Fri, 22 Mar 2019 09:47:09 -0400 Received: from imap1.codethink.co.uk ([176.9.8.82]:50038 "EHLO imap1.codethink.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728005AbfCVNrJ (ORCPT ); Fri, 22 Mar 2019 09:47:09 -0400 Received: from [167.98.27.226] (helo=ct-lt-1124) by imap1.codethink.co.uk with esmtpsa (Exim 4.84_2 #1 (Debian)) id 1h7KVm-0000ab-MB; Fri, 22 Mar 2019 13:47:06 +0000 Received: from tpreston by ct-lt-1124 with local (Exim 4.89) (envelope-from ) id 1h7KVm-0007IE-AO; Fri, 22 Mar 2019 13:47:06 +0000 From: Thomas Preston To: rjw@rjwysocki.net, lenb@kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Thomas Preston Subject: [PATCH] Documentation: acpi: Add an example for PRP0001 Date: Fri, 22 Mar 2019 13:47:05 +0000 Message-Id: <20190322134705.27994-1-thomas.preston@codethink.co.uk> X-Mailer: git-send-email 2.11.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add an example for the magic PRP0001 device ID which allows matching ACPI devices against drivers using OF Device Tree compatible property. It wasn't clear to me that PRP0001 could be used in _CID. Signed-off-by: Thomas Preston --- Documentation/acpi/enumeration.txt | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/Documentation/acpi/enumeration.txt b/Documentation/acpi/enumeration.txt index 7bcf9c3d9fbe..391db643065a 100644 --- a/Documentation/acpi/enumeration.txt +++ b/Documentation/acpi/enumeration.txt @@ -410,6 +410,33 @@ Specifically, the device IDs returned by _HID and preceding PRP0001 in the _CID return package will be checked first. Also in that case the bus type the device will be enumerated to depends on the device ID returned by _HID. +For example, the following ACPI sample might be used to enumerate an lm75-type +I2C temperature sensor and match it to the driver using the Device Tree +namespace link: + + Device (TMP0) + { + Name (_HID, "TITMP75") /* _HID will appear in sysfs */ + Name (_CID, "PRP0001") + Name (_DSD, Package() { + ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), + Package () { + Package (2) { "compatible", "ti,tmp75" }, + } + }) + Method (_CRS, 0, Serialized) + { + Name (SBUF, ResourceTemplate () + { + I2cSerialBusV2 (0x48, ControllerInitiated, + 400000, AddressingMode7Bit, + "\\_SB.PCI0.I2C1", 0x00, + ResourceConsumer, , Exclusive,) + }) + Return (SBUF) + } + } + It is valid to define device objects with a _HID returning PRP0001 and without the "compatible" property in the _DSD or a _CID as long as one of their ancestors provides a _DSD with a valid "compatible" property. Such device -- 2.11.0