drivers: nvmem: Export nvmem_add_cells()

Not all platforms use device tree. It is useful to be able to add
cells to a NVMEM device from code. Export nvmem_add_cells() so making
this possible.

This required changing the parameters a bit, so that just the cells
and the number of cells are passed, not the whole nvmem config
structure.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 28 insertions, 7 deletions

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index b05aa8e81303..b1c95ef78544 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -353,18 +353,27 @@ static int nvmem_cell_info_to_nvmem_cell(struct nvmem_device *nvmem,
         return 0;
 }
 
-static int nvmem_add_cells(struct nvmem_device *nvmem,
-                           const struct nvmem_config *cfg)
+/**
+ * nvmem_add_cells() - Add cell information to an nvmem device
+ *
+ * @nvmem: nvmem device to add cells to.
+ * @info: nvmem cell info to add to the device
+ * @ncells: number of cells in info
+ *
+ * Return: 0 or negative error code on failure.
+ */
+int nvmem_add_cells(struct nvmem_device *nvmem,
+                    const struct nvmem_cell_info *info,
+                    int ncells)
 {
         struct nvmem_cell **cells;
-        const struct nvmem_cell_info *info = cfg->cells;
         int i, rval;
 
-        cells = kcalloc(cfg->ncells, sizeof(*cells), GFP_KERNEL);
+        cells = kcalloc(ncells, sizeof(*cells), GFP_KERNEL);
         if (!cells)
                 return -ENOMEM;
 
-        for (i = 0; i < cfg->ncells; i++) {
+        for (i = 0; i < ncells; i++) {
                 cells[i] = kzalloc(sizeof(**cells), GFP_KERNEL);
                 if (!cells[i]) {
                         rval = -ENOMEM;
@@ -380,7 +389,7 @@ static int nvmem_add_cells(struct nvmem_device *nvmem,
                 nvmem_cell_add(cells[i]);
         }
 
-        nvmem->ncells = cfg->ncells;
+        nvmem->ncells = ncells;
         /* remove tmp array */
         kfree(cells);
 
@@ -393,6 +402,7 @@ err:
 
         return rval;
 }
+EXPORT_SYMBOL_GPL(nvmem_add_cells);
 
 /*
  * nvmem_setup_compat() - Create an additional binary entry in
@@ -509,7 +519,7 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
         }
 
         if (config->cells)
-                nvmem_add_cells(nvmem, config);
+                nvmem_add_cells(nvmem, config->cells, config->ncells);
 
         return nvmem;
 
diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
index f89598bc4e1c..24def6ad09bb 100644
--- a/include/linux/nvmem-provider.h
+++ b/include/linux/nvmem-provider.h
@@ -77,6 +77,9 @@ struct nvmem_device *devm_nvmem_register(struct device *dev,
 
 int devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem);
 
+int nvmem_add_cells(struct nvmem_device *nvmem,
+                    const struct nvmem_cell_info *info,
+                    int ncells);
 #else
 
 static inline struct nvmem_device *nvmem_register(const struct nvmem_config *c)
@@ -99,6 +102,14 @@ static inline int
 devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem)
 {
         return nvmem_unregister(nvmem);
+
+}
+
+static inline int nvmem_add_cells(struct nvmem_device *nvmem,
+                                  const struct nvmem_cell_info *info,
+                                  int ncells)
+{
+        return -ENOSYS;
 }
 
 #endif /* CONFIG_NVMEM */