From patchwork Mon Jan 26 16:16:17 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 5710961 X-Patchwork-Delegate: geert@linux-m68k.org Return-Path: X-Original-To: patchwork-linux-sh@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 6D64B9F2ED for ; Mon, 26 Jan 2015 16:18:12 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 7A499200FF for ; Mon, 26 Jan 2015 16:18:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8D25F2012B for ; Mon, 26 Jan 2015 16:18:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756275AbbAZQQh (ORCPT ); Mon, 26 Jan 2015 11:16:37 -0500 Received: from baptiste.telenet-ops.be ([195.130.132.51]:44661 "EHLO baptiste.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756202AbbAZQQd (ORCPT ); Mon, 26 Jan 2015 11:16:33 -0500 Received: from ayla.of.borg ([84.193.93.87]) by baptiste.telenet-ops.be with bizsmtp id kgGH1p0121t5w8s01gGHh4; Mon, 26 Jan 2015 17:16:29 +0100 Received: from ramsan.of.borg ([192.168.97.29] helo=ramsan) by ayla.of.borg with esmtp (Exim 4.82) (envelope-from ) id 1YFmKm-0005YN-MG; Mon, 26 Jan 2015 17:16:16 +0100 Received: from geert by ramsan with local (Exim 4.82) (envelope-from ) id 1YFmKp-0005JL-5W; Mon, 26 Jan 2015 17:16:19 +0100 From: Geert Uytterhoeven To: Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Grant Likely , Arnd Bergmann , Kevin Hilman , Ulf Hansson , "Rafael J. Wysocki" , Felipe Balbi Cc: Olof Johansson , Simon Horman , Magnus Damm , Greg Kroah-Hartman , devicetree@vger.kernel.org, linux-sh@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH v4 5/5] drivers: bus: Add Simple Power-Managed Bus Driver Date: Mon, 26 Jan 2015 17:16:17 +0100 Message-Id: <1422288977-20353-6-git-send-email-geert+renesas@glider.be> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1422288977-20353-1-git-send-email-geert+renesas@glider.be> References: <1422288977-20353-1-git-send-email-geert+renesas@glider.be> Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add a driver for transparent busses that don't need a real driver, but where the bus controller is part of a PM domain, or under the control of a functional clock. Typically, the bus controller's PM domain and/or clock must be enabled for child devices connected to the bus (either on-SoC or externally) to function. Hence the sole purpose of this driver is to enable its clock and PM domain (if exist(s)), which are specified in the DT and managed from platform and PM domain code, and to probe for child devices. Due to the child-parent relationship with devices connected to the bus, PM domain and clock state transitions are handled in the correct order. Signed-off-by: Geert Uytterhoeven Tested-by: Ulrich Hecht --- v4: - Bind against the generic "simple-pm-bus" instead of "renesas,bsc", - Explicitly call of_platform_populate() after pm_runtime_enable() to enforce ordering, instead of depending on claimed compatibility with "simple-bus", v3: - Add Tested-by, v2: - Rename from "Renesas Bus State Controller Driver" (renesas-bsc) to "Simple Power-Managed Bus Driver" (simple-pm-bus), - Change module license to GPL v2, - Change email address to geert+renesas@glider.be. --- drivers/bus/Kconfig | 13 ++++++++++ drivers/bus/Makefile | 1 + drivers/bus/simple-pm-bus.c | 58 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 72 insertions(+) create mode 100644 drivers/bus/simple-pm-bus.c diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig index 626960819e6df16c..7e9c2674af81d6e9 100644 --- a/drivers/bus/Kconfig +++ b/drivers/bus/Kconfig @@ -58,6 +58,19 @@ config OMAP_OCP2SCP OCP2SCP and in OMAP5, both USB PHY and SATA PHY is connected via OCP2SCP. +config SIMPLE_PM_BUS + bool "Simple Power-Managed Bus Driver" + depends on OF && PM + depends on ARCH_SHMOBILE || COMPILE_TEST + help + Driver for transparent busses that don't need a real driver, but + where the bus controller is part of a PM domain, or under the control + of a functional clock, and thus relies on runtime PM for managing + this PM domain and/or clock. + An example of such a bus controller is the Renesas Bus State + Controller (BSC, sometimes called "LBSC within Bus Bridge", or + "External Bus Interface") as found on several Renesas ARM SoCs. + config VEXPRESS_CONFIG bool "Versatile Express configuration bus" default y if ARCH_VEXPRESS diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile index 3cfaf2c7f25ac4f0..e023a2bec664d900 100644 --- a/drivers/bus/Makefile +++ b/drivers/bus/Makefile @@ -14,4 +14,5 @@ obj-$(CONFIG_MVEBU_MBUS) += mvebu-mbus.o obj-$(CONFIG_OMAP_INTERCONNECT) += omap_l3_smx.o omap_l3_noc.o obj-$(CONFIG_OMAP_OCP2SCP) += omap-ocp2scp.o +obj-$(CONFIG_SIMPLE_PM_BUS) += simple-pm-bus.o obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress-config.o diff --git a/drivers/bus/simple-pm-bus.c b/drivers/bus/simple-pm-bus.c new file mode 100644 index 0000000000000000..c5eb46cbf388b507 --- /dev/null +++ b/drivers/bus/simple-pm-bus.c @@ -0,0 +1,58 @@ +/* + * Simple Power-Managed Bus Driver + * + * Copyright (C) 2014-2015 Glider bvba + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include +#include +#include +#include + + +static int simple_pm_bus_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + + dev_dbg(&pdev->dev, "%s\n", __func__); + + pm_runtime_enable(&pdev->dev); + + if (np) + of_platform_populate(np, NULL, NULL, &pdev->dev); + + return 0; +} + +static int simple_pm_bus_remove(struct platform_device *pdev) +{ + dev_dbg(&pdev->dev, "%s\n", __func__); + + pm_runtime_disable(&pdev->dev); + return 0; +} + +static const struct of_device_id simple_pm_bus_of_match[] = { + { .compatible = "simple-pm-bus", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, simple_pm_bus_of_match); + +static struct platform_driver simple_pm_bus_driver = { + .probe = simple_pm_bus_probe, + .remove = simple_pm_bus_remove, + .driver = { + .name = "simple-pm-bus", + .of_match_table = simple_pm_bus_of_match, + }, +}; + +module_platform_driver(simple_pm_bus_driver); + +MODULE_DESCRIPTION("Simple Power-Managed Bus Driver"); +MODULE_AUTHOR("Geert Uytterhoeven "); +MODULE_LICENSE("GPL v2");