linux-kernel - [PATCH 2/3] tty: serial: meson: retrieve port FIFO size from DT

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Message-Id: <20210315083459.359773-3-narmstrong@baylibre.com>
Date:   Mon, 15 Mar 2021 09:34:58 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     gregkh@...uxfoundation.org
Cc:     devicetree@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>
Subject: [PATCH 2/3] 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.

Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/tty/serial/meson_uart.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
index 69eeef9edfa5..7244b12aefab 100644
--- a/drivers/tty/serial/meson_uart.c
+++ b/drivers/tty/serial/meson_uart.c
@@ -717,6 +717,7 @@ 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;
 	int id = -1;
 
@@ -743,6 +744,8 @@ static int meson_uart_probe(struct platform_device *pdev)
 	if (!res_irq)
 		return -ENODEV;
 
+	of_property_read_u32(pdev->dev.of_node, "amlogic,uart-fifosize", &fifosize);
+
 	if (meson_ports[pdev->id]) {
 		dev_err(&pdev->dev, "port %d already allocated\n", pdev->id);
 		return -EBUSY;
@@ -772,7 +775,7 @@ 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);
-- 
2.25.1