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serial: samsung: alloc dma stucture in ourport

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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@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Robert Baldyga 2014-12-10 12:49:23 +01:00 committed by Greg Kroah-Hartman
parent 7bb6b2f65e
commit 658c9d2b73
1 changed files with 12 additions and 0 deletions
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12
drivers/tty/serial/samsung.c
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@ -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)) {