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Subject[PATCH v3 1/3] nvmem: core: allow to register cells during nvmem registration
Date
Add NVMEM_PRE_ADD notification step which is called before any cells
binding - from lookup table or config, this allows to register cells
in some specific layout (tlv) which should be parsed first and then
registered. So there might be a cell parser driver which can register
lookup table during this notification step.

Signed-off-by: Vadym Kochan <vadym.kochan@plvision.eu>
---
v3:
1) Update core.c changes by extending notification mechanism
by adding new NVMEM_PRE_ADD event id which is called before lookup
table cells binding, this allows for notification handler to
register cells which require nvmem parsing.

drivers/nvmem/core.c | 2 ++
include/linux/nvmem-consumer.h | 1 +
2 files changed, 3 insertions(+)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 6cd3edb2eaf6..c48a69e0ebbe 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -668,6 +668,8 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
goto err_device_del;
}

+ blocking_notifier_call_chain(&nvmem_notifier, NVMEM_PRE_ADD, nvmem);
+
if (config->cells) {
rval = nvmem_add_cells(nvmem, config->cells, config->ncells);
if (rval)
diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h
index 052293f4cbdb..0f7107276756 100644
--- a/include/linux/nvmem-consumer.h
+++ b/include/linux/nvmem-consumer.h
@@ -50,6 +50,7 @@ enum {
NVMEM_REMOVE,
NVMEM_CELL_ADD,
NVMEM_CELL_REMOVE,
+ NVMEM_PRE_ADD,
};

#if IS_ENABLED(CONFIG_NVMEM)
--
2.17.1
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