linux-kernel - [PATCH v7 4/7] nvmem: core: Notify when a new layout is registered

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Message-Id: <20230801182132.1058707-5-miquel.raynal@bootlin.com>
Date:   Tue,  1 Aug 2023 20:21:29 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Robert Marko <robert.marko@...tura.hr>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Michael Walle <michael@...le.cc>,
        <linux-kernel@...r.kernel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Chen-Yu Tsai <wenst@...omium.org>,
        Daniel Golle <daniel@...rotopia.org>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH v7 4/7] nvmem: core: Notify when a new layout is registered

Tell listeners a new layout was introduced and is now available.

Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 drivers/nvmem/core.c           | 4 ++++
 include/linux/nvmem-consumer.h | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 4e81e0aaf433..0406fbc7b750 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -776,12 +776,16 @@ int __nvmem_layout_register(struct nvmem_layout *layout, struct module *owner)
 	list_add(&layout->node, &nvmem_layouts);
 	spin_unlock(&nvmem_layout_lock);
 
+	blocking_notifier_call_chain(&nvmem_notifier, NVMEM_LAYOUT_ADD, layout);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(__nvmem_layout_register);
 
 void nvmem_layout_unregister(struct nvmem_layout *layout)
 {
+	blocking_notifier_call_chain(&nvmem_notifier, NVMEM_LAYOUT_REMOVE, layout);
+
 	spin_lock(&nvmem_layout_lock);
 	list_del(&layout->node);
 	spin_unlock(&nvmem_layout_lock);
diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h
index fa030d93b768..859d41431e2f 100644
--- a/include/linux/nvmem-consumer.h
+++ b/include/linux/nvmem-consumer.h
@@ -43,6 +43,8 @@ enum {
 	NVMEM_REMOVE,
 	NVMEM_CELL_ADD,
 	NVMEM_CELL_REMOVE,
+	NVMEM_LAYOUT_ADD,
+	NVMEM_LAYOUT_REMOVE,
 };
 
 #if IS_ENABLED(CONFIG_NVMEM)
-- 
2.34.1