From patchwork Mon Aug 12 18:49:44 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leonard Crestez X-Patchwork-Id: 1145864 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=devicetree-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=nxp.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 466lJm5mRyz9sNp for ; Tue, 13 Aug 2019 04:50:00 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726541AbfHLSt6 (ORCPT ); Mon, 12 Aug 2019 14:49:58 -0400 Received: from inva021.nxp.com ([92.121.34.21]:51522 "EHLO inva021.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726488AbfHLSt6 (ORCPT ); Mon, 12 Aug 2019 14:49:58 -0400 Received: from inva021.nxp.com (localhost [127.0.0.1]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 49584200696; Mon, 12 Aug 2019 20:49:55 +0200 (CEST) Received: from inva024.eu-rdc02.nxp.com (inva024.eu-rdc02.nxp.com [134.27.226.22]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 31398200692; Mon, 12 Aug 2019 20:49:55 +0200 (CEST) Received: from fsr-ub1864-112.ea.freescale.net (fsr-ub1864-112.ea.freescale.net [10.171.82.98]) by inva024.eu-rdc02.nxp.com (Postfix) with ESMTP id C3EC12060E; Mon, 12 Aug 2019 20:49:53 +0200 (CEST) From: Leonard Crestez To: Stephen Boyd , MyungJoo Ham , Kyungmin Park , Rob Herring Cc: Shawn Guo , Michael Turquette , Chanwoo Choi , =?utf-8?b?QXJ0dXIgxZp3aWdvxYQ=?= , Saravana Kannan , Krzysztof Kozlowski , Alexandre Bailon , Georgi Djakov , Dong Aisheng , Abel Vesa , Jacky Bai , Anson Huang , Fabio Estevam , Viresh Kumar , Will Deacon , Mark Rutland , devicetree@vger.kernel.org, linux-pm@vger.kernel.org, linux-imx@nxp.com, kernel@pengutronix.de, linux-arm-kernel@lists.infradead.org Subject: [PATCH 0/7] PM / devfreq: Add initial imx support Date: Mon, 12 Aug 2019 21:49:44 +0300 Message-Id: X-Mailer: git-send-email 2.17.1 X-Virus-Scanned: ClamAV using ClamSMTP Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org This adds devfreq support for imx8mm, covering dynamic scaling of internal NOC and DDR Controller Scaling for simple busses (NIC/NOC) is done through the clk framework while DRAM scaling is performed in firmware with an "imx-ddrc" wrapper for devfreq. Changes since RFCv3: * Implement passive support and set NOC parent to DDRC * Drop scaling AHB/AXI for now (NOC/DDRC use most power anyway) * Split into two devreq drivers (and bindings) because the ddrc is really a distinct piece of hardware. * Stop relying on clk_min_rate * Fetch info about dram clk parents from firmware instead of hardcoding in driver. This can more easily support additional rates. * Perform DRAM frequency inside devfreq instead of clk, mostly due to objections to earlier RFCs for "imx8m-dram-clk" * Link: https://patchwork.kernel.org/cover/11056779/ * Link: https://patchwork.kernel.org/patch/11049429/ Stephen: It would be very helpful if you could comment on the dram frequency switching code. I moved it outside of clk but now I have to use provider APIs outside of drivers/clk for parent manipulation. Few other drivers do that so maybe it's OK? Scaling buses can cause problems for devices with realtime bandwith requirements such as display, the intention is to use the interconnect framework to make DEV_PM_QOS_MIN_FREQUENCY to devfreq. There are separate patches for that: * https://patchwork.kernel.org/patch/11084279/ * https://patchwork.kernel.org/cover/11078671/ Leonard Crestez (7): clk: imx8m: Set CLK_GET_RATE_NOCACHE on dram_alt/apb dt-bindings: devfreq: Add bindings for generic imx buses PM / devfreq: Add generic imx bus driver dt-bindings: devfreq: Add bindings for imx ddr controller PM / devfreq: Add dynamic scaling for imx ddr controller PM / devfreq: imx-ddrc: Measure bandwidth with perf arm64: dts: imx8mm: Add devfreq nodes .../devicetree/bindings/devfreq/imx-ddrc.yaml | 53 ++ .../devicetree/bindings/devfreq/imx.yaml | 50 ++ arch/arm64/boot/dts/freescale/imx8mm.dtsi | 51 +- drivers/clk/imx/clk-imx8mm.c | 6 +- drivers/clk/imx/clk-imx8mn.c | 6 +- drivers/clk/imx/clk-imx8mq.c | 7 +- drivers/devfreq/Kconfig | 12 + drivers/devfreq/Makefile | 1 + drivers/devfreq/imx-ddrc.c | 511 ++++++++++++++++++ drivers/devfreq/imx-devfreq.c | 148 +++++ 10 files changed, 837 insertions(+), 8 deletions(-) create mode 100644 Documentation/devicetree/bindings/devfreq/imx-ddrc.yaml create mode 100644 Documentation/devicetree/bindings/devfreq/imx.yaml create mode 100644 drivers/devfreq/imx-ddrc.c create mode 100644 drivers/devfreq/imx-devfreq.c