tty: serial: meson: retrieve port FIFO size from DT

Now the DT bindings has a property to get the FIFO size for a particular port,
retrieve it and use to setup the FIFO interrupts threshold.

Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20210518075833.3736038-3-narmstrong@baylibre.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
index d7f5503..efee393 100644 (file)
--- a/drivers/tty/serial/meson_uart.c
+++ b/drivers/tty/serial/meson_uart.c
@@ -715,6 +715,7 @@ static int meson_uart_probe(struct platform_device *pdev)
 {
        struct resource *res_mem, *res_irq;
        struct uart_port *port;
+       u32 fifosize = 64; /* Default is 64, 128 for EE UART_0 */
        int ret = 0;
 
        if (pdev->dev.of_node)
@@ -742,6 +743,8 @@ static int meson_uart_probe(struct platform_device *pdev)
        if (!res_irq)
                return -ENODEV;
 
+       of_property_read_u32(pdev->dev.of_node, "fifo-size", &fifosize);
+
        if (meson_ports[pdev->id]) {
                dev_err(&pdev->dev, "port %d already allocated\n", pdev->id);
                return -EBUSY;
@@ -771,7 +774,7 @@ static int meson_uart_probe(struct platform_device *pdev)
        port->type = PORT_MESON;
        port->x_char = 0;
        port->ops = &meson_uart_ops;
-       port->fifosize = 64;
+       port->fifosize = fifosize;
 
        meson_ports[pdev->id] = port;
        platform_set_drvdata(pdev, port);