serial: sirf: move to use generic dma dt-binding to get dma channels

instead of using sirf specific dma channel property like "sirf,uart-dma-rx-channel"
and "sirf,uart-dma-tx-channel", here we move to use generic dma dt-binding to get
the channel like:
- sirf,uart-dma-rx-channel = <21>;
- sirf,uart-dma-tx-channel = <2>;
+ dmas = <&dmac1 5>, <&dmac0 2>;
+ dma-names = "rx", "tx";

and we move dma_request_channel() to dma_request_slave_channel(), we don't need to
call sirfsoc dma filter function sirfsoc_dma_filter_id() again.

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 0 insertions, 5 deletions

diff --git a/drivers/tty/serial/sirfsoc_uart.h b/drivers/tty/serial/sirfsoc_uart.h
index b7d679c0881b..8a6eddad2f3c 100644
--- a/drivers/tty/serial/sirfsoc_uart.h
+++ b/drivers/tty/serial/sirfsoc_uart.h
@@ -392,9 +392,6 @@ struct sirfsoc_uart_register sirfsoc_uart = {
 /* Indicate how many buffers used */
 #define SIRFSOC_RX_LOOP_BUF_CNT		2
 
-/* Indicate if DMA channel valid */
-#define IS_DMA_CHAN_VALID(x)	((x) != -1)
-#define UNVALID_DMA_CHAN	-1
 /* For Fast Baud Rate Calculation */
 struct sirfsoc_baudrate_to_regv {
 	unsigned int baud_rate;
@@ -423,8 +420,6 @@ struct sirfsoc_uart_port {
 	/* for SiRFmarco, there are SET/CLR for UART_INT_EN */
 	bool				is_marco;
 	struct sirfsoc_uart_register	*uart_reg;
-	int				rx_dma_no;
-	int				tx_dma_no;
 	struct dma_chan			*rx_dma_chan;
 	struct dma_chan			*tx_dma_chan;
 	dma_addr_t			tx_dma_addr;