msm_serial: Add devicetree support

* Qualcomm MSM UART

Required properties:

- compatible :

	- "qcom,msm-uart", and one of "qcom,msm-hsuart" or

	  "qcom,msm-lsuart".

- reg : offset and length of the register set for the device

	for the hsuart operating in compatible mode, there should be a

	second pair describing the gsbi registers.

- interrupts : should contain the uart interrupt.

There are two different UART blocks used in MSM devices,

"qcom,msm-hsuart" and "qcom,msm-lsuart".  The msm-serial driver is

able to handle both of these, and matches against the "qcom,msm-uart"

as the compatibility.

The registers for the "qcom,msm-hsuart" device need to specify both

register blocks, even for the common driver.

Example:

	uart@19c400000 {

		compatible = "qcom,msm-hsuart", "qcom,msm-uart";

		reg = <0x19c40000 0x1000>,

		      <0x19c00000 0x1000>;

		interrupts = <195>;

	};

# define SUPPORT_SYSRQ

#endif

#include <linux/atomic.h>

#include <linux/hrtimer.h>

#include <linux/module.h>

#include <linux/io.h>

#include <linux/clk.h>

#include <linux/platform_device.h>

#include <linux/delay.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include "msm_serial.h"

	.cons = MSM_CONSOLE,

};

static atomic_t msm_uart_next_id = ATOMIC_INIT(0);

static int __init msm_serial_probe(struct platform_device *pdev)

{

	struct msm_port *msm_port;

	struct uart_port *port;

	int irq;

	if (pdev->id == -1)

		pdev->id = atomic_inc_return(&msm_uart_next_id) - 1;

	if (unlikely(pdev->id < 0 || pdev->id >= UART_NR))

		return -ENXIO;

	return 0;

}

static struct of_device_id msm_match_table[] = {

	{ .compatible = "qcom,msm-uart" },

	{}

};

static struct platform_driver msm_platform_driver = {

	.remove = msm_serial_remove,

	.driver = {

		.name = "msm_serial",

		.owner = THIS_MODULE,

		.of_match_table = msm_match_table,

	},

};