[PATCH 7/9] dmaengine: Move slave caps to dma_device

[Maxime Ripard <maxime.ripard@free-electrons.com>]

The previous code was relying on the fact that the slave_caps were to be
defined on a per channel basis.

However, this proved to be a bit overkill, since every driver filling these so
far were hardcoding it, disregarding which channel was actually given.

Add these capabilities to the dma_device structure, so that drivers can just
provide them at probe time, and be done with it.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
 include/linux/dmaengine.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index cfcbee145898..e25a365b808c 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -594,6 +594,14 @@ struct dma_tx_state {
  * @fill_align: alignment shift for memset operations
  * @dev_id: unique device ID
  * @dev: struct device reference for dma mapping api
+ * @src_addr_widths: bit mask of src addr widths the device supports
+ * @dst_addr_widths: bit mask of dst addr widths the device supports
+ * @directions: bit mask of slave direction the device supports since
+ * 	the enum dma_transfer_direction is not defined as bits for
+ * 	each type of direction, the dma controller should fill (1 <<
+ * 	<TYPE>) and same should be checked by controller as well
+ * @residue_granularity: granularity of the transfer residue reported
+ *	by tx_status
  * @device_alloc_chan_resources: allocate resources and return the
  *	number of allocated descriptors
  * @device_free_chan_resources: release DMA channel's resources
@@ -643,6 +651,11 @@ struct dma_device {
 	int dev_id;
 	struct device *dev;
 
+	u32 src_addr_widths;
+	u32 dst_addr_widths;
+	u32 directions;
+	enum dma_residue_granularity residue_granularity;
+
 	int (*device_alloc_chan_resources)(struct dma_chan *chan);
 	void (*device_free_chan_resources)(struct dma_chan *chan);
 
@@ -783,6 +796,11 @@ static inline int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_cap
 	if (!test_bit(DMA_SLAVE, device->cap_mask.bits))
 		return -ENXIO;
 
+	caps->src_addr_widths = device->src_addr_widths;
+	caps->dst_addr_widths = device->dst_addr_widths;
+	caps->directions = device->directions;
+	caps->residue_granularity = device->residue_granularity;
+
 	caps->cmd_pause = !!device->device_pause;
 	caps->cmd_terminate = !!device->device_terminate_all;
 
-- 
2.1.0