pwm: jz4740: Add support for devicetree

Ingenic JZ47xx PWM Controller

=============================

Required properties:

- compatible: One of:

  * "ingenic,jz4740-pwm"

  * "ingenic,jz4770-pwm"

  * "ingenic,jz4780-pwm"

- #pwm-cells: Should be 3. See pwm.txt in this directory for a description

  of the cells format.

- clocks : phandle to the external clock.

- clock-names : Should be "ext".

Example:

	pwm: pwm@10002000 {

		compatible = "ingenic,jz4740-pwm";

		reg = <0x10002000 0x1000>;

		#pwm-cells = <3>;

		clocks = <&ext>;

		clock-names = "ext";

	};

#include <linux/gpio.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/pwm.h>

	jz4740->chip.ops = &jz4740_pwm_ops;

	jz4740->chip.npwm = NUM_PWM;

	jz4740->chip.base = -1;

	jz4740->chip.of_xlate = of_pwm_xlate_with_flags;

	jz4740->chip.of_pwm_n_cells = 3;

	platform_set_drvdata(pdev, jz4740);

	return pwmchip_remove(&jz4740->chip);

}

#ifdef CONFIG_OF

static const struct of_device_id jz4740_pwm_dt_ids[] = {

	{ .compatible = "ingenic,jz4740-pwm", },

	{ .compatible = "ingenic,jz4770-pwm", },

	{ .compatible = "ingenic,jz4780-pwm", },

	{},

};

MODULE_DEVICE_TABLE(of, jz4740_pwm_dt_ids);

#endif

static struct platform_driver jz4740_pwm_driver = {

	.driver = {

		.name = "jz4740-pwm",

		.of_match_table = of_match_ptr(jz4740_pwm_dt_ids),

	},

	.probe = jz4740_pwm_probe,

	.remove = jz4740_pwm_remove,