[v1,11/14] nvmem: core: export nvmem device size

Commit Message

Michael Walle Aug. 25, 2022, 9:44 p.m. UTC

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 <[e-mail]>
---
 drivers/nvmem/core.c           | 13 +++++++++++++
 include/linux/nvmem-consumer.h |  6 ++++++
 2 files changed, 19 insertions(+)

Patch

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index cbfbe6264e6c..f46ae358fe88 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -2031,6 +2031,19 @@  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 761b8ef78adc..6b2a80a5fdd5 100644
--- a/include/linux/nvmem-consumer.h
+++ b/include/linux/nvmem-consumer.h
@@ -90,6 +90,7 @@  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);
 
@@ -219,6 +220,11 @@  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;