On Mon, Jul 04, 2011 at 09:38:26AM +0200, Uwe Kleine-K?nig wrote:

On Mon, Jul 04, 2011 at 08:58:20AM +0200, Sascha Hauer wrote:

quoted

On Sun, Jul 03, 2011 at 03:56:00PM +0800, Shawn Guo wrote:

quoted

It adds device tree probe support for imx tty/serial driver.

Signed-off-by: Jeremy Kerr <redacted>
Signed-off-by: Jason Liu <redacted>
Signed-off-by: Shawn Guo <redacted>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Alan Cox <redacted>
Cc: Grant Likely <redacted>
---
 .../bindings/tty/serial/fsl-imx-uart.txt           |   19 +++++
 drivers/tty/serial/imx.c                           |   82 +++++++++++++++++---
 2 files changed, 91 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..a9c0406
--- /dev/null
+++ b/Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt

@@ -0,0 +1,19 @@
+* Freescale i.MX Universal Asynchronous Receiver/Transmitter (UART)
+
+Required properties:
+- compatible : Should be "fsl,<soc>-uart"
+- reg : Address and length of the register set for the device
+- interrupts : Should contain uart interrupt
+
+Optional properties:
+- fsl,uart-has-rtscts : Indicate the uart has rts and cts
+- fsl,irda-mode : Indicate the uart supports irda mode
+
+Example:
+
+uart at 73fbc000 {
+	compatible = "fsl,imx51-uart", "fsl,imx21-uart";
+	reg = <0x73fbc000 0x4000>;
+	interrupts = <31>;
+	fsl,uart-has-rtscts;
+};

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 983f3bd..483c447 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_device.h>
 
 #include <asm/io.h>
 #include <asm/irq.h>

@@ -239,6 +241,12 @@ static struct platform_device_id imx_uart_devtype[] = {
 	}
 };
 
+static struct of_device_id imx_uart_dt_ids[] = {
+	{ .compatible = "fsl,imx1-uart", .data = &imx_uart_devdata[IMX1_UART], },
+	{ .compatible = "fsl,imx21-uart", .data = &imx_uart_devdata[IMX2_UART], },
+	{ /* sentinel */ },
+};

Isn't this table a bit too small? What about the other SoCs?

I'd expect that using fsl,imx21-uart on imx51 would result in a working
port, but it feels stange and if that's the intention the example above
needs fixing.

Here is what I have in dts file for uart.  The 'compatible' tells
that it's a imx51-uart and compatible with imx21-uart.

uart0: uart at 73fbc000 {
	compatible = "fsl,imx51-uart", "fsl,imx21-uart";
	reg = <0x73fbc000 0x4000>;
	interrupts = <31>;
	fsl,uart-has-rtscts;
};

I did not buy it until I got convinced by Grant here [1].  We do not
need this long table until there are some soc specific thing to
distinguish.  Currently, they are all compatible with imx21-uart and
share imx_uart_devdata[IMX2_UART].

{ .compatible = "fsl,imx21-uart", .data = &imx_uart_devdata[IMX2_UART], },
{ .compatible = "fsl,imx25-uart", .data = &imx_uart_devdata[IMX2_UART], },
{ .compatible = "fsl,imx27-uart", .data = &imx_uart_devdata[IMX2_UART], },
{ .compatible = "fsl,imx31-uart", .data = &imx_uart_devdata[IMX2_UART], },
{ .compatible = "fsl,imx35-uart", .data = &imx_uart_devdata[IMX2_UART], },
{ .compatible = "fsl,imx50-uart", .data = &imx_uart_devdata[IMX2_UART], },
{ .compatible = "fsl,imx51-uart", .data = &imx_uart_devdata[IMX2_UART], },
{ .compatible = "fsl,imx53-uart", .data = &imx_uart_devdata[IMX2_UART], },

[1] http://permalink.gmane.org/gmane.linux.network/198935

-- 
Regards,
Shawn