When we have "dmas" property in serial node in device-tree, we do
memory alocation for dma structure which will be used in DMA handling
code.
Based on previous work of Sylwester Nawrocki and Lukasz Czerwinski.
Signed-off-by: Robert Baldyga <r.baldyga@xxxxxxxxxxx>
---
drivers/tty/serial/samsung.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 19273e3..7196a3e 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -1209,6 +1209,18 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
ret = platform_get_irq(platdev, 1);
if (ret > 0)
ourport->tx_irq = ret;
+ /*
+ * DMA is currently supported only on DT platforms, if DMA properties
+ * are specified.
+ */
+ if (platdev->dev.of_node && of_find_property(platdev->dev.of_node,
+ "dmas", NULL)) {
+ ourport->dma = devm_kzalloc(port->dev,
+ sizeof(*ourport->dma),
+ GFP_KERNEL);
+ if (!ourport->dma)
+ return -ENOMEM;
+ }
ourport->clk = clk_get(&platdev->dev, "uart");
if (IS_ERR(ourport->clk)) {
--
1.9.1
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