Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755643Ab3HOK6O (ORCPT ); Thu, 15 Aug 2013 06:58:14 -0400 Received: from co9ehsobe002.messaging.microsoft.com ([207.46.163.25]:15641 "EHLO co9outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755378Ab3HOK6L (ORCPT ); Thu, 15 Aug 2013 06:58:11 -0400 X-Forefront-Antispam-Report: CIP:70.37.183.190;KIP:(null);UIP:(null);IPV:NLI;H:mail.freescale.net;RD:none;EFVD:NLI X-SpamScore: 3 X-BigFish: VS3(zzzz1f42h208ch1ee6h1de0h1fdah2073h1202h1e76h1d1ah1d2ah1fc6h1082kzz1de098h8275bh1de097hz2dh2a8h668h839hd24he5bhf0ah1288h12a5h12a9h12bdh12e5h137ah139eh13b6h1441h1504h1537h162dh1631h1758h1898h18e1h1946h19b5h1ad9h1b0ah1b2fh1fb3h1d0ch1d2eh1d3fh1dfeh1dffh1e23h1fe8h1ff5h1155h) From: Dong Aisheng To: , CC: , , , Subject: [PATCH 1/3] of: add device node status update APIs Date: Thu, 15 Aug 2013 18:55:31 +0800 Message-ID: <1376564133-11286-2-git-send-email-b29396@freescale.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1376564133-11286-1-git-send-email-b29396@freescale.com> References: <1376564133-11286-1-git-send-email-b29396@freescale.com> MIME-Version: 1.0 Content-Type: text/plain X-OriginatorOrg: freescale.com X-FOPE-CONNECTOR: Id%0$Dn%*$RO%0$TLS%0$FQDN%$TlsDn% Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3331 Lines: 118 Used for convineniently update the device node status. Signed-off-by: Dong Aisheng --- drivers/of/base.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/of.h | 5 +++ 2 files changed, 79 insertions(+), 0 deletions(-) diff --git a/drivers/of/base.c b/drivers/of/base.c index 5c54279..f944a54 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -1424,6 +1424,80 @@ int of_update_property(struct device_node *np, struct property *newprop) return 0; } +/* update the node status property to be "enabled" or "disabled" */ +static int of_node_status_update(struct device_node *np, bool enable) +{ + struct property *oldprop; + struct property *newprop; + int ret; + + if (of_device_is_available(np) == enable) + return 0; + + oldprop = of_find_property(np, "status", NULL); + + if (enable) { + /* for disabled node, there must be a status property with "disabled" state */ + ret = of_remove_property(np, oldprop); + } else { + newprop = kzalloc(sizeof(*newprop), GFP_KERNEL); + if (!newprop) + return -ENOMEM; + + newprop->name = kstrdup("status", GFP_KERNEL); + newprop->value = kstrdup("disabled", GFP_KERNEL); + newprop->length = 9; + if (!newprop->name || !newprop->value) { + kfree(newprop->name); + kfree(newprop->value); + kfree(newprop); + return -ENOMEM; + } + + ret = of_update_property(np, newprop); + } + + pr_debug("%s: %s --> %s %s\n", np->full_name, enable ? + "disabled" : "enabled", enable ? "enabled" : "disabled", + ret ? "failed" : "okay"); + + return ret; +} + +int of_node_status_disable(struct device_node *np) +{ + return of_node_status_update(np, 0); +} + +int of_node_status_enable(struct device_node *np) +{ + return of_node_status_update(np, 1); +} + +int of_node_status_disable_by_path(const char *path) +{ + struct device_node *np; + + pr_debug("disable node: %s\n", path); + np = of_find_node_by_path(path); + if (!np) + return -ENODEV; + + return of_node_status_update(np, 0); +} + +int of_node_status_enable_by_path(const char *path) +{ + struct device_node *np; + + pr_debug("enable node: %s\n", path); + np = of_find_node_by_path(path); + if (!np) + return -ENODEV; + + return of_node_status_update(np, 1); +} + #if defined(CONFIG_OF_DYNAMIC) /* * Support for dynamic device trees. diff --git a/include/linux/of.h b/include/linux/of.h index 1fd08ca..61b35fe 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -292,6 +292,11 @@ extern int of_add_property(struct device_node *np, struct property *prop); extern int of_remove_property(struct device_node *np, struct property *prop); extern int of_update_property(struct device_node *np, struct property *newprop); +extern int of_node_status_disable(struct device_node *np); +extern int of_node_status_enable(struct device_node *np); +extern int of_node_status_disable_by_path(const char *path); +extern int of_node_status_enable_by_path(const char *path); + /* For updating the device tree at runtime */ #define OF_RECONFIG_ATTACH_NODE 0x0001 #define OF_RECONFIG_DETACH_NODE 0x0002 -- 1.7.1 -- 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/