1 files changed, 21 insertions, 2 deletions

diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h
index 1fd7c4467e5a..aefc378f8dc9 100644
--- a/include/linux/mfd/core.h
+++ b/include/linux/mfd/core.h
@@ -33,9 +33,10 @@ struct mfd_cell {
         /* driver-specific data for MFD-aware "cell" drivers */
         void                    *driver_data;
 
-        /* platform_data can be used to either pass data to "generic"
-           driver or as a hook to mfd_cell for the "cell" drivers */
+        /* platform_data can be used to pass data to "generic" drivers */
         void                    *platform_data;
+
+        /* unused */
         size_t                  data_size;
 
         /*
@@ -55,6 +56,24 @@ struct mfd_cell {
         bool                    pm_runtime_no_callbacks;
 };
 
+/*
+ * Given a platform device that's been created by mfd_add_devices(), fetch
+ * the mfd_cell that created it.
+ */
+static inline const struct mfd_cell *mfd_get_cell(struct platform_device *pdev)
+{
+        return pdev->dev.platform_data;
+}
+
+/*
+ * Given a platform device that's been created by mfd_add_devices(), fetch
+ * the .platform_data entry from the mfd_cell that created it.
+ */
+static inline void *mfd_get_data(struct platform_device *pdev)
+{
+        return mfd_get_cell(pdev)->platform_data;
+}
+
 extern int mfd_add_devices(struct device *parent, int id,
                            const struct mfd_cell *cells, int n_devs,
                            struct resource *mem_base,