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Subject[PATCH 1/3] serial/imx: add device tree support
Date
It adds device tree data parsing support for imx tty/serial driver.

Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
Signed-off-by: Jason Liu <jason.hui@linaro.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
---
.../bindings/tty/serial/fsl-imx-uart.txt | 21 +++++
drivers/tty/serial/imx.c | 81 +++++++++++++++++---
2 files changed, 92 insertions(+), 10 deletions(-)
create mode 100644 Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt

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..7648e17
--- /dev/null
+++ b/Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt
@@ -0,0 +1,21 @@
+* Freescale i.MX Universal Asynchronous Receiver/Transmitter (UART)
+
+Required properties:
+- compatible : should be "fsl,<soc>-uart", "fsl,imx-uart"
+- reg : address and length of the register set for the device
+- interrupts : should contain uart interrupt
+- id : should be the port ID defined by soc
+
+Optional properties:
+- fsl,has-rts-cts : indicate it has rts-cts
+- fsl,irda-mode : support irda mode
+
+Example:
+
+uart@73fbc000 {
+ compatible = "fsl,imx51-uart", "fsl,imx-uart";
+ reg = <0x73fbc000 0x4000>;
+ interrupts = <31>;
+ id = <1>;
+ fsl,has-rts-cts;
+};
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index a544731..2769353 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -45,6 +45,8 @@
#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>
@@ -1223,6 +1225,63 @@ 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;
+ const __be32 *line;
+
+ if (!node)
+ return -ENODEV;
+
+ line = of_get_property(node, "id", NULL);
+ if (!line)
+ return -ENODEV;
+
+ sport->port.line = be32_to_cpup(line) - 1;
+
+ 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;
+
+ return 0;
+}
+
+static struct of_device_id imx_uart_dt_ids[] = {
+ { .compatible = "fsl,imx-uart" },
+ {},
+};
+#else
+static int serial_imx_probe_dt(struct imx_port *sport,
+ struct platform_device *pdev)
+{
+ return -ENODEV;
+}
+#define imx_uart_dt_ids NULL
+#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;
+
+ if (pdata->flags & IMXUART_IRDA)
+ sport->use_irda = 1;
+
+ sport->port.line = pdev->id;
+
+ return 0;
+}
+
static int serial_imx_probe(struct platform_device *pdev)
{
struct imx_port *sport;
@@ -1235,6 +1294,12 @@ 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;
@@ -1259,7 +1324,6 @@ 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;
@@ -1273,17 +1337,13 @@ 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)
@@ -1344,6 +1404,7 @@ static struct platform_driver serial_imx_driver = {
.driver = {
.name = "imx-uart",
.owner = THIS_MODULE,
+ .of_match_table = imx_uart_dt_ids,
},
};

--
1.7.4.1


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