From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: ARC-Seal: i=1; a=rsa-sha256; t=1524756579; cv=none; d=google.com; s=arc-20160816; b=vjFQWrDXVlBcA4pkM8Hb6aD9gvFnRuOdoi4pftFyNfrT1WM+zpmRdug5n5WHlzQ7s7 4O3OPfH1fJB+M0UyjPum8nLp1Ox/YOp9+Iza6OuBBSX5V9JTGrfom5tlTvMEaIDHInM+ 9HtXapk1MPpyrLJkCwqTbfjTDAmajg2ueXER7wz+xIX6JU0+otUXcfg9aeA//RYw1tlG SeAZLnZDYK4jXHJf8AH9OiZZWkf+OyUf6j11I8zZ3n/0WQSOpeXzpfjdtUzuI+l20FHt 5PLUM8Wji1fLGiN7gIM0QtPjdpckM2yG38El5UBU3l5Vys3iY3/8NX3rfgiQ+SyZUwoJ EvLA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature:arc-authentication-results; bh=WnQuJXVTSeMq7JNTlBOZGHl3KR8ySUXtb6WxGSGIr1I=; b=0ERnY85KqGy5pUWm6DBQ6XryWAZwl1CFSWrYKSBkhov6HF6flOSu7qqjJKEwbRTUXw W78eyfvbD+rL9nbQskR/lhTVYdKv6gEpPJ8uBPTuF5ayewt42F6lxlISfjEf6tqqUCDF Ji1nAUpPF9lt0tQ3s4vwnOGCNqxzRNlRr1reD1WwafoFd9WvVjJkYT90QqpFeGrstUaV wSL1D1aCaB3z6QS6fPVv2TKdk5ckGvRwtf+rSJSMMihtDyC02ZfWyZUkLV3KNTHloFu/ O0mXXc9bSFhMgAbLCGm9My2fw7YAuKkfhpo23sQUdCiKba+GEkyKiwi0zZjso0lkUjlH MsyA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@bgdev-pl.20150623.gappssmtp.com header.s=20150623 header.b=Z3Vk8S4x; spf=neutral (google.com: 209.85.220.65 is neither permitted nor denied by best guess record for domain of brgl@bgdev.pl) smtp.mailfrom=brgl@bgdev.pl Authentication-Results: mx.google.com; dkim=pass header.i=@bgdev-pl.20150623.gappssmtp.com header.s=20150623 header.b=Z3Vk8S4x; spf=neutral (google.com: 209.85.220.65 is neither permitted nor denied by best guess record for domain of brgl@bgdev.pl) smtp.mailfrom=brgl@bgdev.pl X-Google-Smtp-Source: AIpwx49lUdv9rFxYtt8BWEIkmBcmwZ6QfG8YcGdOLhE4Bz20ITMR9aegchkisBIFVmbTwsentmgI9g== From: Bartosz Golaszewski To: Sekhar Nori , Kevin Hilman , David Lechner , Michael Turquette , Stephen Boyd , Arnd Bergmann , Greg Kroah-Hartman , Rob Herring , Mark Rutland , Yoshinori Sato , Rich Felker , Frank Rowand , "Rafael J . Wysocki" , Jarkko Sakkinen , Dmitry Torokhov , Arend van Spriel , Heikki Krogerus , Michal Suchanek , Jan Kiszka , Andy Shevchenko , Marc Zyngier , Peter Rosin Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH RFC PoC 2/2] misc: implement a dummy early platform driver Date: Thu, 26 Apr 2018 17:29:20 +0200 Message-Id: <20180426152920.21569-3-brgl@bgdev.pl> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180426152920.21569-1-brgl@bgdev.pl> References: <20180426152920.21569-1-brgl@bgdev.pl> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1598823155281818966?= X-GMAIL-MSGID: =?utf-8?q?1598823155281818966?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Bartosz Golaszewski Implement a very simple early platform driver. Its purpose is to show how such drivers can be registered and to emit a message when probed. It can be then added to the device tree or machine code to verify that the early platform devices work as expected. Signed-off-by: Bartosz Golaszewski --- drivers/misc/Kconfig | 8 +++++++ drivers/misc/Makefile | 1 + drivers/misc/dummy-early.c | 46 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 55 insertions(+) create mode 100644 drivers/misc/dummy-early.c diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 5d713008749b..99cde8aefdb0 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -91,6 +91,14 @@ config DUMMY_IRQ The sole purpose of this module is to help with debugging of systems on which spurious IRQs would happen on disabled IRQ vector. +config DUMMY_EARLY + bool "Dummy early platform driver" + select EARLYDEV + default n + help + This module's only function is to register itself with the early + platform device framework and be probed early in the boot process. + config IBM_ASM tristate "Device driver for IBM RSA service processor" depends on X86 && PCI && INPUT diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 20be70c3f118..84ad0225eb14 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_INTEL_MID_PTI) += pti.o obj-$(CONFIG_ATMEL_SSC) += atmel-ssc.o obj-$(CONFIG_ATMEL_TCLIB) += atmel_tclib.o obj-$(CONFIG_DUMMY_IRQ) += dummy-irq.o +obj-$(CONFIG_DUMMY_EARLY) += dummy-early.o obj-$(CONFIG_ICS932S401) += ics932s401.o obj-$(CONFIG_LKDTM) += lkdtm/ obj-$(CONFIG_TIFM_CORE) += tifm_core.o diff --git a/drivers/misc/dummy-early.c b/drivers/misc/dummy-early.c new file mode 100644 index 000000000000..f00fb1fbd5fa --- /dev/null +++ b/drivers/misc/dummy-early.c @@ -0,0 +1,46 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2018 Texas Instruments + * + * Author: + * Bartosz Golaszewski + * + * Dummy testing driver whose only purpose is to be registered and probed + * using the early platform device mechanism. + */ + +#include +#include +#include +#include +#include + +static int dummy_early_probe(struct platform_device *pdev) +{ + if (earlydev_probing_early()) + dev_notice(&pdev->dev, "dummy-early driver probed early!\n"); + else + dev_notice(&pdev->dev, "dummy-early driver probed late!\n"); + + return 0; +} + +static const struct of_device_id dummy_early_of_match[] = { + { .compatible = "none,dummy-early", }, + { }, +}; + +static struct earlydev_driver dummy_early_driver = { + .plat_drv = { + .probe = dummy_early_probe, + .driver = { + .name = "dummy-early", + .of_match_table = dummy_early_of_match, + }, + } +}; +earlydev_platform_driver(dummy_early_driver); + +MODULE_AUTHOR("Bartosz Golaszewski "); +MODULE_DESCRIPTION("Dummy early platform device driver"); +MODULE_LICENSE("GPL v2"); -- 2.17.0