From patchwork Fri May 11 16:20:27 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 10394699 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 64C12602B1 for ; Fri, 11 May 2018 16:31:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id ECFC828F4E for ; Fri, 11 May 2018 16:31:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E0BD128F50; Fri, 11 May 2018 16:31:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 5012E28F4E for ; Fri, 11 May 2018 16:31:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=Dqd3KyU85GbHy2HZnwFI4qY7f5/yChHqq2dcHorV4VY=; b=fCklyTJ0ogpnNl9ERsvNibswSK G7ntd2xrwhkwcxD88McUbQFehseMaUcHMmOy2JdfHMLPzRFuQLBMQ7If7pqoHjjLNVlLc69tD2VZ3 7rVrU73PtZ13cJEI+VhCOwCvimag/NktP7/V0qyZdX1JMMv1ldtXCm+Quynyw9WoAfF+rRfQIyoBI FAQALvoqy/jrpVX39v3pvsnKAfAYwGkd1LFgKL4ruUC0Sizjy9bOtQHA3OkBas4mm+A4Tj6Bzi6/Y 4jW7GqSFWqBWAe+KSR8Xfi3lW18Up5XPO4AaMRy2yhWHCDkbJP7UBvcAMrZQVH0ussRVRT70RdVs+ rlpFJpbA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fHAxW-0001mx-35; Fri, 11 May 2018 16:31:54 +0000 Received: from mail-wr0-x241.google.com ([2a00:1450:400c:c0c::241]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fHAnv-0002ke-8w for linux-arm-kernel@lists.infradead.org; Fri, 11 May 2018 16:22:01 +0000 Received: by mail-wr0-x241.google.com with SMTP id p18-v6so5904632wrm.1 for ; Fri, 11 May 2018 09:21:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=QOCcji1G0mbLaXC8GN+RiUfyYG0acDdRp+nxrX6SdFw=; b=RSPv8ca5V1wsN2APjZbBNdne20OMd7hwEt1vNR+5mqVo+vHkSdFPLnnzBtad1NRYRj nxvXXDCGvAZnkZDqOC6SUyY6lfUZ/OEmM8bwnqp/TJ08MtwqQRQNaMEx9OY3qkowKfIE tPLQ9iOaTVEup9EykO2k34FwAjLR7p8/EbDLUa3ifu4O6yIs+LXAihGoW71iJ6RsXrwX MML+lQJ9jF+JXNPFJBxu+5vThT7D75Keg0SgiEB09qWoqGepDBnkt9UO+qFFymtXajzp hBQ7s9NsHtiu2gqnJoKfOb2N3OwF7iGFW3D5BfHQmO6881SohTk5HvP09XCkNQUoDvQ8 dhog== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=QOCcji1G0mbLaXC8GN+RiUfyYG0acDdRp+nxrX6SdFw=; b=e1I80f8ND4KK/iZVNYV3V4Q5i+MERhlsVlLiz/B++3eyafRnLwZ31gAVZLbKHIYEwq 1lxFA15ahqPi6yC2NLuJIfDluLgf8xR46gCHTIk7wW+4fNM4UMFvdOZK1hHNSw89nW8J b+6OqC9c9CcEGaGx1VYjL7FBPMS72r5sqVmpIPpCSWnVeqMrAa/TQX0AT8MAJU1kBXFM qkPHe8zxj/Er002IwAE0RR1ktiAV+pFHNdpXGiH6oyfRJoKHFnEMqGw5nul3CJ4WOGEl MSBcHyZoQyXYC7dKYJEhsxSTgD6LRKH0s1VX1o8WecMvl8YTUkkfguy9BMuhZ7GcKDUl jnuA== X-Gm-Message-State: ALKqPwfJ4OvM8LiVdNE0WW3WFIvNtWJ0orlLfy0+oGILtlGyVFFwdqSz 86k6JpGAbBmFipIb3tb0idW1SA== X-Google-Smtp-Source: AB8JxZracqxLhh5F9oN1ARZPa7MTqRLh4lGUnsAXYnLH9A5CpvPQgZ4gPKCS1K6HkmNFyAwnRSBEBQ== X-Received: by 2002:adf:b71a:: with SMTP id l26-v6mr5222330wre.115.1526055707730; Fri, 11 May 2018 09:21:47 -0700 (PDT) Received: from brgl-bgdev.baylibre.local ([90.63.244.31]) by smtp.gmail.com with ESMTPSA id q17-v6sm1429523wmf.3.2018.05.11.09.21.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 11 May 2018 09:21:47 -0700 (PDT) From: Bartosz Golaszewski To: Sekhar Nori , Kevin Hilman , David Lechner , Michael Turquette , Stephen Boyd , Arnd Bergmann , Greg Kroah-Hartman , Mark Rutland , Yoshinori Sato , Rich Felker , Andy Shevchenko , Marc Zyngier , "Rafael J . Wysocki" , Peter Rosin , Jiri Slaby , Thomas Gleixner , Daniel Lezcano , Geert Uytterhoeven , Magnus Damm , Johan Hovold , Rob Herring , Frank Rowand Subject: [PATCH 11/12] misc: implement a dummy early platform driver Date: Fri, 11 May 2018 18:20:27 +0200 Message-Id: <20180511162028.20616-12-brgl@bgdev.pl> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180511162028.20616-1-brgl@bgdev.pl> References: <20180511162028.20616-1-brgl@bgdev.pl> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180511_092159_363430_71CA4878 X-CRM114-Status: GOOD ( 20.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Bartosz Golaszewski MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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 | 82 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 91 insertions(+) create mode 100644 drivers/misc/dummy-early.c diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 5d713008749b..60fef04eb236 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 + 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 d0a8788d5151..6170855853a1 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..eb8f826aea64 --- /dev/null +++ b/drivers/misc/dummy-early.c @@ -0,0 +1,82 @@ +// 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 + +struct dummy_early_data { + int a; + int b; +}; + +static int dummy_early_probe_early(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct dummy_early_data *data; + struct resource *res; + + dev_notice(dev, "dummy-early driver probed early!\n"); + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->a = 123; + data->b = 321; + + dev_dbg(dev, "setting driver data early: a = %d, b = %d\n", + data->a, data->b); + dev_set_drvdata(dev, data); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (res) + dev_dbg(dev, "got early resource: start = 0x%08x, end = 0x%08x\n", + res->start, res->end); + + return 0; +} + +static int dummy_early_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct dummy_early_data *data; + + dev_notice(dev, "dummy-early driver probed late!\n"); + data = dev_get_drvdata(dev); + dev_dbg(dev, "retrieving driver data late: a = %d, b = %d\n", + data->a, data->b); + + return 0; +} + +static const struct of_device_id dummy_early_of_match[] = { + { .compatible = "dummy-early", }, + { }, +}; + +static struct early_platform_driver dummy_early_driver = { + .early_probe = dummy_early_probe_early, + .pdrv = { + .probe = dummy_early_probe, + .driver = { + .name = "dummy-early", + .of_match_table = dummy_early_of_match, + }, + } +}; +module_early_platform_driver(dummy_early_driver); + +MODULE_AUTHOR("Bartosz Golaszewski "); +MODULE_DESCRIPTION("Dummy early platform device driver"); +MODULE_LICENSE("GPL v2");