From bee1138bea15a640aaa9e9bb909af5b2762520e0 Mon Sep 17 00:00:00 2001
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Date: Fri, 21 Sep 2018 06:40:19 -0700
Subject: nvmem: add a notifier chain
Add a blocking notifier chain with four events (add and remove for
both devices and cells) so that users can get notified about the
addition of nvmem resources they're waiting for.
We'll use this instead of the at24 setup callback in the mityomapl138
board file.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
include/linux/nvmem-consumer.h | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
(limited to 'include/linux/nvmem-consumer.h')
diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h
index 27eee3945405..0326b52e906b 100644
--- a/include/linux/nvmem-consumer.h
+++ b/include/linux/nvmem-consumer.h
@@ -14,6 +14,7 @@
#include <linux/err.h>
#include <linux/errno.h>
+#include <linux/notifier.h>
struct device;
struct device_node;
@@ -47,6 +48,13 @@ struct nvmem_cell_lookup {
struct list_head node;
};
+enum {
+ NVMEM_ADD = 1,
+ NVMEM_REMOVE,
+ NVMEM_CELL_ADD,
+ NVMEM_CELL_REMOVE,
+};
+
#if IS_ENABLED(CONFIG_NVMEM)
/* Cell based interface */
@@ -80,6 +88,9 @@ void nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries,
void nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries,
size_t nentries);
+int nvmem_register_notifier(struct notifier_block *nb);
+int nvmem_unregister_notifier(struct notifier_block *nb);
+
#else
static inline struct nvmem_cell *nvmem_cell_get(struct device *dev,
@@ -179,6 +190,16 @@ nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries) {}
static inline void
nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries) {}
+static inline int nvmem_register_notifier(struct notifier_block *nb)
+{
+ return -ENOSYS;
+}
+
+static inline int nvmem_unregister_notifier(struct notifier_block *nb)
+{
+ return -ENOSYS;
+}
+
#endif /* CONFIG_NVMEM */
#if IS_ENABLED(CONFIG_NVMEM) && IS_ENABLED(CONFIG_OF)
--
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