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>

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;
 

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),

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,