linux-kernel - [PATCH 2/3] nvmem: core: export nvmem device size

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Date:   Tue, 18 Jul 2023 18:06:51 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Michael Walle <michael@...le.cc>,
        Christian Marangi <ansuelsmth@...il.com>,
        devicetree@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] nvmem: core: export nvmem device size

From: Michael Walle <michael@...le.cc>

Export the size of the nvmem device. NVMEM layout drivers might need it
and might not have access to the device which is registering the NVMEM
device.

Signed-off-by: Michael Walle <michael@...le.cc>
---
 drivers/nvmem/core.c           | 13 +++++++++++++
 include/linux/nvmem-consumer.h |  6 ++++++
 2 files changed, 19 insertions(+)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index a0c9153cda28..57ccd4422e01 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -2224,6 +2224,19 @@ const char *nvmem_dev_name(struct nvmem_device *nvmem)
 }
 EXPORT_SYMBOL_GPL(nvmem_dev_name);
 
+/**
+ * nvmem_device_size() - Get the size of a given nvmem device.
+ *
+ * @nvmem: nvmem device.
+ *
+ * Return: size of the nvmem device.
+ */
+size_t nvmem_device_size(struct nvmem_device *nvmem)
+{
+	return nvmem->size;
+}
+EXPORT_SYMBOL_GPL(nvmem_device_size);
+
 static int __init nvmem_init(void)
 {
 	return bus_register(&nvmem_bus_type);
diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h
index fa030d93b768..3270ad81e140 100644
--- a/include/linux/nvmem-consumer.h
+++ b/include/linux/nvmem-consumer.h
@@ -77,6 +77,7 @@ ssize_t nvmem_device_cell_read(struct nvmem_device *nvmem,
 			   struct nvmem_cell_info *info, void *buf);
 int nvmem_device_cell_write(struct nvmem_device *nvmem,
 			    struct nvmem_cell_info *info, void *buf);
+size_t nvmem_device_size(struct nvmem_device *nvmem);
 
 const char *nvmem_dev_name(struct nvmem_device *nvmem);
 
@@ -206,6 +207,11 @@ static inline int nvmem_device_write(struct nvmem_device *nvmem,
 	return -EOPNOTSUPP;
 }
 
+static inline size_t nvmem_device_size(struct nvmem_device *nvmem)
+{
+	return 0;
+}
+
 static inline const char *nvmem_dev_name(struct nvmem_device *nvmem)
 {
 	return NULL;
-- 
2.35.3