From: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
To: Grant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <robherring2@gmail.com>,
Stephen Warren <swarren@wwwdotorg.org>,
Matt Porter <matt.porter@linaro.org>,
Koen Kooi <koen@dominion.thruhere.net>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Alison Chaiken <Alison_Chaiken@mentor.com>,
Dinh Nguyen <dinh.linux@gmail.com>, Jan Lubbe <jluebbe@lasnet.de>,
Alexander Sverdlin <alexander.sverdlin@nsn.com>,
Michael Stickel <ms@mycable.de>,
Guenter Roeck <linux@roeck-us.net>,
Dirk Behme <dirk.behme@gmail.com>,
Alan Tull <delicious.quinoa@gmail.com>,
Sascha Hauer <s.hauer@pengutronix.de>,
Michael Bohan <mbohan@codeaurora.org>,
Ionut Nicu <ioan.nicu.ext@nsn.com>,
Michal Simek <monstr@monstr.eu>,
Matt Ranostay <mranostay@gmail.com>,
Joel Becker <jlbec@evilplan.org>,
devicetree@vger.kernel.org, Wolfram Sang <wsa@the-dreams.de>,
linux-i2c@vger.kernel.org, Mark Brown <broonie@kernel.org>,
linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org,
Pete Popov <pete.popov@konsulko.com>,
Dan Malek <dan.malek@konsulko.com>,
Georgi Vlaev <georgi.vlaev@konsulko.com>,
Pantelis Antoniou <pantelis.antoniou@konsulko.com>,
Pantelis Antoniou <panto@antoniou-consulting.com>
Subject: [PATCH v8 8/8] OF: spi: Add OF notifier handler
Date: Tue, 28 Oct 2014 22:36:05 +0200 [thread overview]
Message-ID: <1414528565-10907-9-git-send-email-pantelis.antoniou@konsulko.com> (raw)
In-Reply-To: <1414528565-10907-1-git-send-email-pantelis.antoniou@konsulko.com>
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 <pantelis.antoniou@konsulko.com>
---
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
prev parent reply other threads:[~2014-10-28 20:36 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-28 20:35 [PATCH v8 0/8] Device Tree Overlays - 8th time's the charm Pantelis Antoniou
2014-10-28 20:35 ` [PATCH v8 1/8] OF: Introduce DT overlay support. (v2) Pantelis Antoniou
2014-11-13 23:36 ` Grant Likely
2014-11-17 14:35 ` Pantelis Antoniou
2014-11-17 22:54 ` Grant Likely
2014-10-28 20:35 ` [PATCH v8 2/8] OF: selftest: Add overlay self-test " Pantelis Antoniou
2014-10-28 20:36 ` [PATCH v8 3/8] OF: DT-Overlay configfs interface (v2) Pantelis Antoniou
2014-11-25 10:28 ` Grant Likely
2014-11-25 14:50 ` Pantelis Antoniou
2014-11-26 12:49 ` Grant Likely
2014-10-28 20:36 ` [PATCH v8 4/8] OF: platform: Add OF notifier handler Pantelis Antoniou
2014-11-13 23:29 ` Grant Likely
2014-11-14 15:13 ` Pantelis Antoniou
2014-10-28 20:36 ` [PATCH v8 5/8] of: i2c: Export single device registration method Pantelis Antoniou
2014-11-21 1:46 ` Grant Likely
2014-11-23 16:22 ` Wolfram Sang
2014-10-28 20:36 ` [PATCH v8 6/8] OF: i2c: Add OF notifier handler Pantelis Antoniou
2014-11-21 1:53 ` Grant Likely
2014-11-21 2:03 ` Guenter Roeck
2014-11-21 15:08 ` Grant Likely
2014-11-21 15:11 ` Pantelis Antoniou
2014-11-23 16:23 ` Wolfram Sang
2014-10-28 20:36 ` [PATCH v8 7/8] of: spi: Export single device registration method and accessors Pantelis Antoniou
2014-10-29 7:44 ` Alexander Sverdlin
2014-10-29 8:19 ` Pantelis Antoniou
2014-10-28 20:36 ` Pantelis Antoniou [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1414528565-10907-9-git-send-email-pantelis.antoniou@konsulko.com \
--to=pantelis.antoniou@konsulko.com \
--cc=Alison_Chaiken@mentor.com \
--cc=alexander.sverdlin@nsn.com \
--cc=broonie@kernel.org \
--cc=dan.malek@konsulko.com \
--cc=delicious.quinoa@gmail.com \
--cc=devicetree@vger.kernel.org \
--cc=dinh.linux@gmail.com \
--cc=dirk.behme@gmail.com \
--cc=georgi.vlaev@konsulko.com \
--cc=grant.likely@secretlab.ca \
--cc=gregkh@linuxfoundation.org \
--cc=ioan.nicu.ext@nsn.com \
--cc=jlbec@evilplan.org \
--cc=jluebbe@lasnet.de \
--cc=koen@dominion.thruhere.net \
--cc=linux-i2c@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-spi@vger.kernel.org \
--cc=linux@roeck-us.net \
--cc=matt.porter@linaro.org \
--cc=mbohan@codeaurora.org \
--cc=monstr@monstr.eu \
--cc=mranostay@gmail.com \
--cc=ms@mycable.de \
--cc=panto@antoniou-consulting.com \
--cc=pete.popov@konsulko.com \
--cc=robherring2@gmail.com \
--cc=s.hauer@pengutronix.de \
--cc=swarren@wwwdotorg.org \
--cc=wsa@the-dreams.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).