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serial: samsung: get fifosize via device tree

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UART modules on some SoCs only differ in the fifosize of each
UART channel. Its useless to duplicate the drv_data structure
or create a compatible name for such a change.

We can get fifosize via the device tree nodes (not mandating it).

Also updates the documentation.

Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Naveen Krishna Chatradhi 2014-07-14 17:07:16 +05:30 committed by Greg Kroah-Hartman
parent b1261c86fe
commit 135f07c325
2 changed files with 13 additions and 3 deletions
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4
Documentation/devicetree/bindings/serial/samsung_uart.txt
View file

@ -29,6 +29,9 @@ Required properties:
[1] Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
[2] Documentation/devicetree/bindings/clock/clock-bindings.txt
Optional properties:
- samsung,uart-fifosize: The fifo size supported by the UART channel
Note: Each Samsung UART should have an alias correctly numbered in the
"aliases" node, according to serialN format, where N is the port number
(non-negative decimal integer) as specified by User's Manual of respective
@ -51,4 +54,5 @@ Example:
"clk_uart_baud3";
clocks = <&clocks PCLK_UART1>, <&clocks PCLK_UART1>,
<&clocks SCLK_UART>;
samsung,uart-fifosize = <16>;
};

12
drivers/tty/serial/samsung.c
View file

@ -1295,9 +1295,15 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
dev_get_platdata(&pdev->dev) :
ourport->drv_data->def_cfg;
ourport->port.fifosize = (ourport->info->fifosize) ?
ourport->info->fifosize :
ourport->drv_data->fifosize[index];
if (pdev->dev.of_node)
of_property_read_u32(pdev->dev.of_node,
"samsung,uart-fifosize", &ourport->port.fifosize);
if (!ourport->port.fifosize) {
ourport->port.fifosize = (ourport->info->fifosize) ?
ourport->info->fifosize :
ourport->drv_data->fifosize[index];
}
probe_index++;