Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754041AbdDCQoe (ORCPT ); Mon, 3 Apr 2017 12:44:34 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:42114 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753022AbdDCQoc (ORCPT ); Mon, 3 Apr 2017 12:44:32 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 90AC160DDD Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=pprakash@codeaurora.org Subject: Re: [PATCH 0/2] Make cppc acpi driver aware of pcc subspace ids To: George Cherian , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, devel@acpica.org References: <1490941442-11954-1-git-send-email-george.cherian@cavium.com> Cc: ashwin.chaugule@linaro.org, rjw@rjwysocki.net, lenb@kernel.org, jassisinghbrar@gmail.com, robert.moore@intel.com, lv.zheng@intel.com From: "Prakash, Prashanth" Message-ID: Date: Mon, 3 Apr 2017 10:44:29 -0600 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <1490941442-11954-1-git-send-email-george.cherian@cavium.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 594 Lines: 14 Hi George, On 3/31/2017 12:24 AM, George Cherian wrote: > The current cppc acpi driver works with only one pcc subspace id. > It maintains and registers only one pcc channel even if the acpi table has > different pcc subspace ids. The series tries to address the same by making > cppc acpi driver aware of multiple possible pcc subspace ids. The current ACPI 6.1 spec restricts the CPPC to a single PCC subspace. See section: 8.4.7.1.9 Using PCC Registers, which states "If the PCC register space is used, all PCC registers must be defined to be in the same subspace." -- Thanks, Prashanth