spi/of: Add OF notifier handler

Add OF notifier handler needed for creating/destroying spi devices
according to dynamic runtime changes in the DT live tree. This code is
enabled when CONFIG_OF_DYNAMIC is selected.

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Cc: <linux-spi@vger.kernel.org>

1 files changed, 84 insertions, 0 deletions

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index a3557c57d4f7..bf1cab0fad66 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -2317,6 +2317,86 @@ EXPORT_SYMBOL_GPL(spi_write_then_read);
 
 /*-------------------------------------------------------------------------*/
 
+#if IS_ENABLED(CONFIG_OF_DYNAMIC)
+static int __spi_of_device_match(struct device *dev, void *data)
+{
+        return dev->of_node == data;
+}
+
+/* must call put_device() when done with returned spi_device device */
+static struct spi_device *of_find_spi_device_by_node(struct device_node *node)
+{
+        struct device *dev = bus_find_device(&spi_bus_type, NULL, node,
+                                                __spi_of_device_match);
+        return dev ? to_spi_device(dev) : NULL;
+}
+
+static int __spi_of_master_match(struct device *dev, const void *data)
+{
+        return dev->of_node == data;
+}
+
+/* the spi masters are not using spi_bus, so we find it with another way */
+static struct spi_master *of_find_spi_master_by_node(struct device_node *node)
+{
+        struct device *dev;
+
+        dev = class_find_device(&spi_master_class, NULL, node,
+                                __spi_of_master_match);
+        if (!dev)
+                return NULL;
+
+        /* reference got in class_find_device */
+        return container_of(dev, struct spi_master, dev);
+}
+
+static int of_spi_notify(struct notifier_block *nb, unsigned long action,
+                         void *arg)
+{
+        struct of_reconfig_data *rd = arg;
+        struct spi_master *master;
+        struct spi_device *spi;
+
+        switch (of_reconfig_get_state_change(action, arg)) {
+        case OF_RECONFIG_CHANGE_ADD:
+                master = of_find_spi_master_by_node(rd->dn->parent);
+                if (master == NULL)
+                        return NOTIFY_OK;       /* not for us */
+
+                spi = of_register_spi_device(master, rd->dn);
+                put_device(&master->dev);
+
+                if (IS_ERR(spi)) {
+                        pr_err("%s: failed to create for '%s'\n",
+                                        __func__, rd->dn->full_name);
+                        return notifier_from_errno(PTR_ERR(spi));
+                }
+                break;
+
+        case OF_RECONFIG_CHANGE_REMOVE:
+                /* find our device by node */
+                spi = of_find_spi_device_by_node(rd->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);
+                break;
+        }
+
+        return NOTIFY_OK;
+}
+
+static struct notifier_block spi_of_notifier = {
+        .notifier_call = of_spi_notify,
+};
+#else /* IS_ENABLED(CONFIG_OF_DYNAMIC) */
+extern struct notifier_block spi_of_notifier;
+#endif /* IS_ENABLED(CONFIG_OF_DYNAMIC) */
+
 static int __init spi_init(void)
 {
         int     status;
@@ -2334,6 +2414,10 @@ static int __init spi_init(void)
         status = class_register(&spi_master_class);
         if (status < 0)
                 goto err2;
+
+        if (IS_ENABLED(CONFIG_OF))
+                WARN_ON(of_reconfig_notifier_register(&spi_of_notifier));
+
         return 0;
 
 err2: