mfd: add platform_data to mfd_cell

Adding platform_data to mfd_cell allows passing of platform data directly
to the platform_device created for each cell and thus reuse of existing
drivers.
On the other side it can be used as a hook to mfd_cell itself
removing the need in mfd_get_cell method.

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Acked-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>

3 files changed, 12 insertions, 7 deletions

diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
index 50207700140c..ad4e4d16a36a 100644
--- a/drivers/mfd/mfd-core.c
+++ b/drivers/mfd/mfd-core.c
@@ -32,7 +32,7 @@ static int mfd_add_device(struct platform_device *parent,
         pdev->dev.parent = &parent->dev;
 
         ret = platform_device_add_data(pdev,
-                        cell, sizeof(struct mfd_cell));
+                        cell->platform_data, cell->data_size);
         if (ret)
                 goto fail_device;
 
diff --git a/drivers/mfd/tc6393xb.c b/drivers/mfd/tc6393xb.c
index 94e55e8e7ce6..9908aaa4881a 100644
--- a/drivers/mfd/tc6393xb.c
+++ b/drivers/mfd/tc6393xb.c
@@ -466,6 +466,10 @@ static int __devinit tc6393xb_probe(struct platform_device *dev)
                 tc6393xb_attach_irq(dev);
 
         tc6393xb_cells[TC6393XB_CELL_NAND].driver_data = tcpd->nand_data;
+        tc6393xb_cells[TC6393XB_CELL_NAND].platform_data =
+                &tc6393xb_cells[TC6393XB_CELL_NAND];
+        tc6393xb_cells[TC6393XB_CELL_NAND].data_size =
+                sizeof(tc6393xb_cells[TC6393XB_CELL_NAND]);
 
         retval = mfd_add_devices(dev,
                         tc6393xb_cells, ARRAY_SIZE(tc6393xb_cells),
diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h
index b7cbb9968339..ea45d4a5a2ac 100644
--- a/include/linux/mfd/core.h
+++ b/include/linux/mfd/core.h
@@ -29,7 +29,13 @@ struct mfd_cell {
         int                     (*suspend)(struct platform_device *dev);
         int                     (*resume)(struct platform_device *dev);
 
-        void                    *driver_data; /* driver-specific data */
+        /* 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 */
+        void                    *platform_data;
+        size_t                  data_size;
 
         /*
          * This resources can be specified relatievly to the parent device.
@@ -39,11 +45,6 @@ struct mfd_cell {
         const struct resource   *resources;
 };
 
-static inline struct mfd_cell *mfd_get_cell(struct platform_device *pdev)
-{
-        return (struct mfd_cell *)pdev->dev.platform_data;
-}
-
 extern int mfd_add_devices(struct platform_device *parent,
                            const struct mfd_cell *cells, int n_devs,
                            struct resource *mem_base,