Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751857AbaKXWg0 (ORCPT ); Mon, 24 Nov 2014 17:36:26 -0500 Received: from mail-wg0-f50.google.com ([74.125.82.50]:64473 "EHLO mail-wg0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751304AbaKXWeN (ORCPT ); Mon, 24 Nov 2014 17:34:13 -0500 From: Grant Likely To: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Pantelis Antoniou Cc: Rob Herring , Mark Brown , Wolfram Sang , Grant Likely Subject: [PATCH v2 08/14] of/reconfig: Add OF_DYNAMIC notifier for platform_bus_type Date: Mon, 24 Nov 2014 22:33:36 +0000 Message-Id: <1416868422-22103-9-git-send-email-grant.likely@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1416868422-22103-1-git-send-email-grant.likely@linaro.org> References: <1416868422-22103-1-git-send-email-grant.likely@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Pantelis Antoniou Add OF notifier handler needed for creating/destroying platform devices according to dynamic runtime changes in the DT live tree. Signed-off-by: Pantelis Antoniou Signed-off-by: Grant Likely --- drivers/base/platform.c | 1 + drivers/of/platform.c | 55 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/of_platform.h | 6 +++++ 3 files changed, 62 insertions(+) diff --git a/drivers/base/platform.c b/drivers/base/platform.c index b2afc29403f9..233ececd15a3 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -1006,6 +1006,7 @@ int __init platform_bus_init(void) error = bus_register(&platform_bus_type); if (error) device_unregister(&platform_bus); + of_platform_register_reconfig_notifier(); return error; } diff --git a/drivers/of/platform.c b/drivers/of/platform.c index 656cccf0e680..cd87a36495be 100644 --- a/drivers/of/platform.c +++ b/drivers/of/platform.c @@ -550,4 +550,59 @@ void of_platform_depopulate(struct device *parent) } EXPORT_SYMBOL_GPL(of_platform_depopulate); +#ifdef CONFIG_OF_DYNAMIC +static int of_platform_notify(struct notifier_block *nb, + unsigned long action, void *arg) +{ + struct of_reconfig_data *rd = arg; + struct platform_device *pdev_parent, *pdev; + bool children_left; + + switch (of_reconfig_get_state_change(action, rd)) { + case OF_RECONFIG_CHANGE_ADD: + /* verify that the parent is a bus */ + if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS)) + return NOTIFY_OK; /* not for us */ + + /* pdev_parent may be NULL when no bus platform device */ + pdev_parent = of_find_device_by_node(rd->dn->parent); + pdev = of_platform_device_create(rd->dn, NULL, + pdev_parent ? &pdev_parent->dev : NULL); + of_dev_put(pdev_parent); + + if (pdev == NULL) { + pr_err("%s: failed to create for '%s'\n", + __func__, rd->dn->full_name); + /* of_platform_device_create tosses the error code */ + return notifier_from_errno(-EINVAL); + } + break; + + case OF_RECONFIG_CHANGE_REMOVE: + /* find our device by node */ + pdev = of_find_device_by_node(rd->dn); + if (pdev == NULL) + return NOTIFY_OK; /* no? not meant for us */ + + /* unregister takes one ref away */ + of_platform_device_destroy(&pdev->dev, &children_left); + + /* and put the reference of the find */ + of_dev_put(pdev); + break; + } + + return NOTIFY_OK; +} + +static struct notifier_block platform_of_notifier = { + .notifier_call = of_platform_notify, +}; + +void of_platform_register_reconfig_notifier(void) +{ + WARN_ON(of_reconfig_notifier_register(&platform_of_notifier)); +} +#endif /* CONFIG_OF_DYNAMIC */ + #endif /* CONFIG_OF_ADDRESS */ diff --git a/include/linux/of_platform.h b/include/linux/of_platform.h index c2b0627a2317..8a860f096c35 100644 --- a/include/linux/of_platform.h +++ b/include/linux/of_platform.h @@ -84,4 +84,10 @@ static inline int of_platform_populate(struct device_node *root, static inline void of_platform_depopulate(struct device *parent) { } #endif +#ifdef CONFIG_OF_DYNAMIC +extern void of_platform_register_reconfig_notifier(void); +#else +static inline void of_platform_register_reconfig_notifier(void) { } +#endif + #endif /* _LINUX_OF_PLATFORM_H */ -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/