gpio: syscon: rockchip: add GRF GPIO support for rk3328

Rockchip RK3328 GRF (General Register Files) GPIO controller.

In Rockchip RK3328, the output only GPIO_MUTE pin, originally for codec mute

control, can also be used for general purpose. It is manipulated by the

GRF_SOC_CON10 register in GRF. Aside from the GPIO_MUTE pin, the HDMI pins can

also be set in the same way.

Currently this GPIO controller only supports the mute pin. If needed in the

future, the HDMI pins support can also be added.

Required properties:

- compatible: Should contain "rockchip,rk3328-grf-gpio".

- gpio-controller: Marks the device node as a gpio controller.

- #gpio-cells: Should be 2. The first cell is the pin number and

  the second cell is used to specify the gpio polarity:

    0 = Active high,

    1 = Active low.

Example:

	grf: syscon@ff100000 {

		compatible = "rockchip,rk3328-grf", "syscon", "simple-mfd";

		grf_gpio: grf-gpio {

			compatible = "rockchip,rk3328-grf-gpio";

			gpio-controller;

			#gpio-cells = <2>;

		};

	};

Note: The grf_gpio node should be declared as the child of the GRF (General

Register File) node. The GPIO_MUTE pin is referred to as <&grf_gpio 0>.

	.dat_bit_offset	= 0x40 * 8 + 8,

};

static void rockchip_gpio_set(struct gpio_chip *chip, unsigned int offset,

			      int val)

{

	struct syscon_gpio_priv *priv = gpiochip_get_data(chip);

	unsigned int offs;

	u8 bit;

	u32 data;

	int ret;

	offs = priv->dreg_offset + priv->data->dat_bit_offset + offset;

	bit = offs % SYSCON_REG_BITS;

	data = (val ? BIT(bit) : 0) | BIT(bit + 16);

	ret = regmap_write(priv->syscon,

			   (offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE,

			   data);

	if (ret < 0)

		dev_err(chip->parent, "gpio write failed ret(%d)\n", ret);

}

static const struct syscon_gpio_data rockchip_rk3328_gpio_mute = {

	/* RK3328 GPIO_MUTE is an output only pin at GRF_SOC_CON10[1] */

	.flags		= GPIO_SYSCON_FEAT_OUT,

	.bit_count	= 1,

	.dat_bit_offset = 0x0428 * 8 + 1,

	.set		= rockchip_gpio_set,

};

#define KEYSTONE_LOCK_BIT BIT(0)

static void keystone_gpio_set(struct gpio_chip *chip, unsigned offset, int val)

		.compatible	= "ti,keystone-dsp-gpio",

		.data		= &keystone_dsp_gpio,

	},

	{

		.compatible	= "rockchip,rk3328-grf-gpio",

		.data		= &rockchip_rk3328_gpio_mute,

	},

	{ }

};

MODULE_DEVICE_TABLE(of, syscon_gpio_ids);