Signed-off-by: Jeremy Kerr <jeremy.k...@canonical.com>
Signed-off-by: Jason Liu <jason....@linaro.org>
---
.../bindings/tty/serial/fsl-imx-uart.txt | 19 +++++
drivers/tty/serial/imx.c | 78 +++++++++++++++++---
2 files changed, 87 insertions(+), 10 deletions(-)
diff --git a/Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt
b/Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt
new file mode 100644
index 0000000..b7ece32
--- /dev/null
+++ b/Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt
@@ -0,0 +1,19 @@
+* UART (Universal Asynchronous Receiver/Transmitter)
+
+Required properties:
+- compatible : "fsl,imx51-uart".
+- reg : Offset and length of the register set for the device.
+- interrupts : should contain uart interrupt.
+- fsl,has-rts-cts : indicate it has rts-cts.
+- uart-clock : the uart clock input information.
+
+Example:
+
+imx-uart@bc000 {
+ compatible = "fsl,imx51-uart";
+ reg = <0xbc000 0x1000>;
+ interrupts = <0x1f>;
+ fsl,has-rts-cts;
+ uart-clock = <&uart0_clk>, "uart";
+};
+
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index dfcf4b1..568550d 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -47,6 +47,8 @@
#include <linux/delay.h>
#include <linux/rational.h>
#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
#include <asm/io.h>
#include <asm/irq.h>
@@ -1224,6 +1226,53 @@ static int serial_imx_resume(struct platform_device *dev)
return 0;
}
+#ifdef CONFIG_OF
+static int serial_imx_probe_dt(struct imx_port *sport,
+ struct platform_device *pdev)
+{
+ struct device_node *node = pdev->dev.of_node;
+ static int line;
+
+ if (!node)
+ return -ENODEV;
+
+ if (of_get_property(node, "fsl,has-rts-cts", NULL))
+ sport->have_rtscts = 1;
+
+ if (of_get_property(node, "fsl,irda-mode", NULL))
+ sport->use_irda = 1;
+
+ sport->port.line = line++;
+
+ return 0;
+}
+#else
+static int serial_imx_probe_dt(struct imx_port *sport,
+ struct platform_device *pdev)
+{
+ return -ENODEV;
+}
+#endif
+
+static int serial_imx_probe_pdata(struct imx_port *sport,
+ struct platform_device *pdev)
+{
+ struct imxuart_platform_data *pdata = pdev->dev.platform_data;
+
+ if (!pdata)
+ return 0;
+
+ if (pdata->flags & IMXUART_HAVE_RTSCTS)
+ sport->have_rtscts = 1;
+
+#ifdef CONFIG_IRDA
+ if (pdata->flags & IMXUART_IRDA)
+ sport->use_irda = 1;
+#endif
+ sport->port.line = pdev->id;
+
+ return 0;
+}
static int serial_imx_probe(struct platform_device *pdev)
{
struct imx_port *sport;
@@ -1236,6 +1285,12 @@ static int serial_imx_probe(struct platform_device *pdev)
if (!sport)
return -ENOMEM;
+ ret = serial_imx_probe_dt(sport, pdev);
+ if (ret == -ENODEV)
+ ret = serial_imx_probe_pdata(sport, pdev);
+ if (ret)
+ goto free;
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
ret = -ENODEV;
@@ -1260,7 +1315,6 @@ static int serial_imx_probe(struct platform_device *pdev)
sport->port.fifosize = 32;
sport->port.ops = &imx_pops;
sport->port.flags = UPF_BOOT_AUTOCONF;
- sport->port.line = pdev->id;
init_timer(&sport->timer);
sport->timer.function = imx_timeout;
sport->timer.data = (unsigned long)sport;
@@ -1274,17 +1328,13 @@ static int serial_imx_probe(struct platform_device
*pdev)
sport->port.uartclk = clk_get_rate(sport->clk);
- imx_ports[pdev->id] = sport;
+ if (imx_ports[sport->port.line]) {
+ ret = -EBUSY;
+ goto clkput;
+ }
+ imx_ports[sport->port.line] = sport;
pdata = pdev->dev.platform_data;
- if (pdata && (pdata->flags & IMXUART_HAVE_RTSCTS))
- sport->have_rtscts = 1;
-
-#ifdef CONFIG_IRDA
- if (pdata && (pdata->flags & IMXUART_IRDA))
- sport->use_irda = 1;
-#endif
-
if (pdata && pdata->init) {
ret = pdata->init(pdev);
if (ret)
@@ -1336,6 +1386,11 @@ static int serial_imx_remove(struct platform_device
*pdev)
return 0;
}
+static struct of_device_id imx_uart_matches[] = {
+ { .compatible = "fsl,imx51-uart" },
+ {},
+};
+
static struct platform_driver serial_imx_driver = {
.probe = serial_imx_probe,
.remove = serial_imx_remove,
@@ -1345,6 +1400,9 @@ static struct platform_driver serial_imx_driver = {
.driver = {
.name = "imx-uart",
.owner = THIS_MODULE,
+#if defined(CONFIG_OF)
+ .of_match_table = imx_uart_matches,
+#endif
},
};
--
1.7.1
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