From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754849AbbFQNm6 (ORCPT ); Wed, 17 Jun 2015 09:42:58 -0400 Received: from mail-wi0-f171.google.com ([209.85.212.171]:38693 "EHLO mail-wi0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752907AbbFQNmw (ORCPT ); Wed, 17 Jun 2015 09:42:52 -0400 From: Tomeu Vizoso To: linux-arm-kernel@lists.infradead.org Cc: Tomeu Vizoso , Alexander Holler , Alexandre Courbot , Andrzej Hajda , Arnd Bergmann , Dmitry Torokhov , Grant Likely , Greg Kroah-Hartman , Ian Campbell , Javier Martinez Canillas , Krzysztof Kozlowski , Kumar Gala , Len Brown , Linus Walleij , linux-kernel@vger.kernel.org, Lv Zheng , Mark Brown , Mark Rutland , Pawel Moll , "Rafael J. Wysocki" , Robert Moore , Rob Herring , Russell King , Stephen Warren , =?UTF-8?q?Terje=20Bergstr=C3=B6m?= , Thierry Reding Subject: [PATCH 00/13] Discover and probe dependencies Date: Wed, 17 Jun 2015 15:42:10 +0200 Message-Id: <1434548543-22949-1-git-send-email-tomeu.vizoso@collabora.com> X-Mailer: git-send-email 2.4.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, this is another attempt at preventing deferred probe from obscuring why your devices aren't probing and from delaying to the end of the boot process the probe of the device you care the most. The major differences with my previous approach [0] are: * Dependencies are probed before the target is probed, so we don't have nested probe() calls, avoiding a series of deadlock situations. * Dependencies could be stored and reused for other purposes such as for passing resources to drivers ala devm_probe, or for warning when a device is going to be unbound and has dependencies active, etc. * I have tried to keep it firmware-agnostic. The previous approach (on-demand probing) could be done like this as well, but would require adding fwnode APIs to all affected subsystems first. I have only implemented the class.get_dependencies() callback for the GPIO subsystem and for the host1x bus because that's all that was needed on my Tegra Chromebook to avoid deferred probes, but if this approach is deemed worthwhile I will add more implementations so that deferred probes are avoided on the other boards I have access to. [0] http://thread.gmane.org/gmane.linux.kernel.gpio/8465 Thanks, Tomeu Tomeu Vizoso (13): gpiolib: Fix docs for gpiochip_add_pingroup_range driver-core: defer all probes until late_initcall ARM: tegra: Add gpio-ranges property pinctrl: tegra: Only set the gpio range if needed driver core: fix docbook for device_private.device of/platform: Set fwnode field for new devices driver-core: Add class.get_dependencies() callback gpio: sysfs: implement class.get_dependencies() gpu: host1x: implement class.get_dependencies() driver-core: add for_each_class() device property: add fwnode_get_parent() device property: add fwnode_get_name() driver-core: probe dependencies before probing arch/arm/boot/dts/tegra114.dtsi | 1 + arch/arm/boot/dts/tegra124.dtsi | 1 + arch/arm/boot/dts/tegra20.dtsi | 1 + arch/arm/boot/dts/tegra30.dtsi | 1 + drivers/base/base.h | 4 +- drivers/base/class.c | 16 +++++ drivers/base/dd.c | 128 +++++++++++++++++++++++++++++++++++++++- drivers/base/property.c | 38 ++++++++++++ drivers/gpio/gpiolib-sysfs.c | 81 +++++++++++++++++++++++++ drivers/gpio/gpiolib.c | 2 +- drivers/gpu/host1x/dev.c | 47 +++++++++++++++ drivers/of/platform.c | 1 + drivers/pinctrl/pinctrl-tegra.c | 19 +++++- include/acpi/acpi_bus.h | 5 ++ include/linux/acpi.h | 5 ++ include/linux/device.h | 6 ++ include/linux/fwnode.h | 5 ++ include/linux/property.h | 4 ++ 18 files changed, 361 insertions(+), 4 deletions(-) -- 2.4.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: tomeu.vizoso@collabora.com (Tomeu Vizoso) Date: Wed, 17 Jun 2015 15:42:10 +0200 Subject: [PATCH 00/13] Discover and probe dependencies Message-ID: <1434548543-22949-1-git-send-email-tomeu.vizoso@collabora.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi, this is another attempt at preventing deferred probe from obscuring why your devices aren't probing and from delaying to the end of the boot process the probe of the device you care the most. The major differences with my previous approach [0] are: * Dependencies are probed before the target is probed, so we don't have nested probe() calls, avoiding a series of deadlock situations. * Dependencies could be stored and reused for other purposes such as for passing resources to drivers ala devm_probe, or for warning when a device is going to be unbound and has dependencies active, etc. * I have tried to keep it firmware-agnostic. The previous approach (on-demand probing) could be done like this as well, but would require adding fwnode APIs to all affected subsystems first. I have only implemented the class.get_dependencies() callback for the GPIO subsystem and for the host1x bus because that's all that was needed on my Tegra Chromebook to avoid deferred probes, but if this approach is deemed worthwhile I will add more implementations so that deferred probes are avoided on the other boards I have access to. [0] http://thread.gmane.org/gmane.linux.kernel.gpio/8465 Thanks, Tomeu Tomeu Vizoso (13): gpiolib: Fix docs for gpiochip_add_pingroup_range driver-core: defer all probes until late_initcall ARM: tegra: Add gpio-ranges property pinctrl: tegra: Only set the gpio range if needed driver core: fix docbook for device_private.device of/platform: Set fwnode field for new devices driver-core: Add class.get_dependencies() callback gpio: sysfs: implement class.get_dependencies() gpu: host1x: implement class.get_dependencies() driver-core: add for_each_class() device property: add fwnode_get_parent() device property: add fwnode_get_name() driver-core: probe dependencies before probing arch/arm/boot/dts/tegra114.dtsi | 1 + arch/arm/boot/dts/tegra124.dtsi | 1 + arch/arm/boot/dts/tegra20.dtsi | 1 + arch/arm/boot/dts/tegra30.dtsi | 1 + drivers/base/base.h | 4 +- drivers/base/class.c | 16 +++++ drivers/base/dd.c | 128 +++++++++++++++++++++++++++++++++++++++- drivers/base/property.c | 38 ++++++++++++ drivers/gpio/gpiolib-sysfs.c | 81 +++++++++++++++++++++++++ drivers/gpio/gpiolib.c | 2 +- drivers/gpu/host1x/dev.c | 47 +++++++++++++++ drivers/of/platform.c | 1 + drivers/pinctrl/pinctrl-tegra.c | 19 +++++- include/acpi/acpi_bus.h | 5 ++ include/linux/acpi.h | 5 ++ include/linux/device.h | 6 ++ include/linux/fwnode.h | 5 ++ include/linux/property.h | 4 ++ 18 files changed, 361 insertions(+), 4 deletions(-) -- 2.4.1