Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755086AbaJ1Ug6 (ORCPT ); Tue, 28 Oct 2014 16:36:58 -0400 Received: from mail-wg0-f52.google.com ([74.125.82.52]:61484 "EHLO mail-wg0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755044AbaJ1Ugy (ORCPT ); Tue, 28 Oct 2014 16:36:54 -0400 From: Pantelis Antoniou To: Grant Likely Cc: Rob Herring , Stephen Warren , Matt Porter , Koen Kooi , Greg Kroah-Hartman , Alison Chaiken , Dinh Nguyen , Jan Lubbe , Alexander Sverdlin , Michael Stickel , Guenter Roeck , Dirk Behme , Alan Tull , Sascha Hauer , Michael Bohan , Ionut Nicu , Michal Simek , Matt Ranostay , Joel Becker , devicetree@vger.kernel.org, Wolfram Sang , linux-i2c@vger.kernel.org, Mark Brown , linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, Pete Popov , Dan Malek , Georgi Vlaev , Pantelis Antoniou , Pantelis Antoniou Subject: [PATCH v8 8/8] OF: spi: Add OF notifier handler Date: Tue, 28 Oct 2014 22:36:05 +0200 Message-Id: <1414528565-10907-9-git-send-email-pantelis.antoniou@konsulko.com> X-Mailer: git-send-email 1.7.12 In-Reply-To: <1414528565-10907-1-git-send-email-pantelis.antoniou@konsulko.com> References: <1414528565-10907-1-git-send-email-pantelis.antoniou@konsulko.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add OF notifier handler needed for creating/destroying spi devices according to dynamic runtime changes in the DT live tree. Signed-off-by: Pantelis Antoniou --- drivers/spi/spi.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 77 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index f81d799..f62a3e4 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -2363,6 +2363,71 @@ EXPORT_SYMBOL_GPL(spi_write_then_read); /*-------------------------------------------------------------------------*/ +#if IS_ENABLED(CONFIG_OF) + +static int of_spi_notify(struct notifier_block *nb, + unsigned long action, void *arg) +{ + struct device_node *dn; + struct spi_master *master; + struct spi_device *spi; + int state; + + state = of_reconfig_get_state_change(action, arg); + if (state == -1) + return NOTIFY_OK; + + switch (action) { + case OF_RECONFIG_ATTACH_NODE: + case OF_RECONFIG_DETACH_NODE: + dn = arg; + break; + case OF_RECONFIG_ADD_PROPERTY: + case OF_RECONFIG_REMOVE_PROPERTY: + case OF_RECONFIG_UPDATE_PROPERTY: + dn = ((struct of_prop_reconfig *)arg)->dn; + break; + default: + return NOTIFY_OK; + } + + if (state) { + + master = of_find_spi_master_by_node(dn->parent); + if (master == NULL) + return NOTIFY_OK; /* not for us */ + + spi = of_register_spi_device(master, dn); + put_device(&master->dev); + + if (IS_ERR(spi)) { + pr_err("%s: failed to create for '%s'\n", + __func__, dn->full_name); + return notifier_from_errno(PTR_ERR(spi)); + } + + } else { + + /* find our device by node */ + spi = of_find_spi_device_by_node(dn); + if (spi == NULL) + return NOTIFY_OK; /* no? not meant for us */ + + /* unregister takes one ref away */ + spi_unregister_device(spi); + + /* and put the reference of the find */ + put_device(&spi->dev); + + } + + return NOTIFY_OK; +} + +static struct notifier_block spi_of_notifier; + +#endif + static int __init spi_init(void) { int status; @@ -2380,8 +2445,19 @@ static int __init spi_init(void) status = class_register(&spi_master_class); if (status < 0) goto err2; - return 0; +#if IS_ENABLED(CONFIG_OF) + spi_of_notifier.notifier_call = of_spi_notify; + status = of_reconfig_notifier_register(&spi_of_notifier); + if (status) + goto err3; +#endif + + return 0; +#if IS_ENABLED(CONFIG_OF) +err3: + class_unregister(&spi_master_class); +#endif err2: bus_unregister(&spi_bus_type); err1: -- 1.7.12 -- 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/