From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: ARC-Seal: i=1; a=rsa-sha256; t=1524591086; cv=none; d=google.com; s=arc-20160816; b=Xq8iUjGdUqDFaL3CMYcYNgGeusTjTyf23d2dyqb3BOqc1uoo6U/g1g7U6orJ4BcD4C Rj3WFqYVf1mxqcVvWm+E+4DNZbXXYdi49nzmInjmGZtqIjrqGZ0qXSwotuT1QnqxKQ26 Udhi6kpgA2ULkAfU35HDHkdIZhgBHjwQ2ifIkKNMffqpLQN/llv7hjTU8BYFpoAvvZuj xMaL9ss+UngCKkJGWBPOQrIVBPha8Hrk3ASrIoFQA7y2TR5h6PStB+6vNuTUAjmlapKK micVVQcw2E9gUB0vdbyLwQVI9XRZmcKrPtxTCyoDgYCASMagdBh4BdPW4XqA/6iEeNZG cYow== 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=0ZUqEQbTcqpkpDOxGI3/y+orvLxUrN9q0d5bu9mYcL4=; b=M1X3XmLUBg8IFLyGQuYR6lJ8ZYMZB85rKF2PqCHNfYfHs+AhPwDKJLbdPQP5jyI/lH aTiciEPoURcQOmAaRwBfChUG+Gwk14fzxD3fMkyIjBS+9dlkKMk1h8CTC1/17BES4RKm hJxGR+Im1xycyMv62RScELZ73OcgpyN3/7P840txzaK1uOj8x/3nPJfVoWw/Fs+kmIoZ vkFwN3a1OlQDaKCNaVeG7mnEA2osoXkq91uZVqMqeQmPsuTD8Zy88MKPf2Jt2E/iOnc1 MEJwJzsCbBw2d/RPZMyTRn4oUFdS4JPc5PM2Ir/lkB2OXUFQ8l5c8L+187Ti9qOOXLxM tleg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@bgdev-pl.20150623.gappssmtp.com header.s=20150623 header.b=fYhYcZaw; 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=fYhYcZaw; 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: AIpwx4/mcDdFzS+Ewjz8HbUrkpXxrR1dAfIO4yxzKEFP+d1JOWB/fFzX0usGCl3mgPijwgItMT6rqw== 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 Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH 11/11] misc: implement a dummy early platform driver Date: Tue, 24 Apr 2018 19:30:51 +0200 Message-Id: <20180424173051.15099-12-brgl@bgdev.pl> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180424173051.15099-1-brgl@bgdev.pl> References: <20180424173051.15099-1-brgl@bgdev.pl> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1598649623488054868?= X-GMAIL-MSGID: =?utf-8?q?1598649623488054868?= 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 | 40 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 49 insertions(+) create mode 100644 drivers/misc/dummy-early.c diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 5d713008749b..bf9b9b355f81 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 EARLY_PLATFORM_DEVICES + 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..b1d555d72ffb --- /dev/null +++ b/drivers/misc/dummy-early.c @@ -0,0 +1,40 @@ +// 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 + +static int dummy_early_probe(struct platform_device *pdev) +{ + dev_notice(&pdev->dev, "dummy-early driver probed!\n"); + + return 0; +} + +static const struct of_device_id dummy_early_of_match[] = { + { .compatible = "none,dummy-early", }, + { }, +}; + +static struct platform_driver dummy_early_driver = { + .probe = dummy_early_probe, + .driver = { + .name = "dummy-early", + .of_match_table = dummy_early_of_match, + }, +}; +early_platform_driver(dummy_early_driver); + +MODULE_AUTHOR("Bartosz Golaszewski "); +MODULE_DESCRIPTION("Dummy early platform device driver"); +MODULE_LICENSE("GPL v2"); -- 2.17.0