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DIR:OUT; SFP:1101; SCL:1; SRVR:AM6PR0402MB3336; H:AM6PR0402MB3334.eurprd04.prod.outlook.com; FPR:; SPF:None; PTR:InfoNoRecords; A:1; MX:1; LANG:en; received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2ae50d11-8def-4e07-c10b-08d534a8a0fd X-MS-Exchange-CrossTenant-originalarrivaltime: 26 Nov 2017 08:35:20.2459 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR0402MB3336 Subject: Re: [RFC] ACPI table HID/CID allocation X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 26 Nov 2017 08:31:04 -0000 Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Andrew=20 =20 > Udit, >=20 > I think it is more like you only need ACPI if you don't have a driver. Ok, then ACPI or say firmware needs to export AML methods, which are known = to OS. > If it is standard bus with standard drivers the OS code can do power mana= gement > without any help from ACPI.=20 In some cases there could be some config registers in IP, which could=20 leads to power down mode, then probably power management could be done without ACPI.=20 If we have clock and regulators doing power management, then ACPI is neede= d. No ?=20 > In general ACPI exists to abstract chipsets that don't > have OS drivers, or mother board layout of power plains, GPIOs, etc. I can think of for power management, without specific driver if such Power saving is limited to internal SOC. For example, say temperature of mother board is read using=20 some sensor connected with SOC over i2c line. And in SOC i2c interface is behind some controller. How do you see to read temperature without having a OS drivers. For power management based on temperature, we may not need a driver. Thanks, Udit