[media] media: atmel-isi: add primary DT support

Atmel Image Sensor Interface (ISI) SoC Camera Subsystem

----------------------------------------------

Required properties:

- compatible: must be "atmel,at91sam9g45-isi"

- reg: physical base address and length of the registers set for the device;

- interrupts: should contain IRQ line for the ISI;

- clocks: list of clock specifiers, corresponding to entries in

          the clock-names property;

- clock-names: must contain "isi_clk", which is the isi peripherial clock.

ISI supports a single port node with parallel bus. It should contain one

'port' child node with child 'endpoint' node. Please refer to the bindings

defined in Documentation/devicetree/bindings/media/video-interfaces.txt.

Example:

	isi: isi@f0034000 {

		compatible = "atmel,at91sam9g45-isi";

		reg = <0xf0034000 0x4000>;

		interrupts = <37 IRQ_TYPE_LEVEL_HIGH 5>;

		clocks = <&isi_clk>;

		clock-names = "isi_clk";

		pinctrl-names = "default";

		pinctrl-0 = <&pinctrl_isi>;

		port {

			#address-cells = <1>;

			#size-cells = <0>;

			isi_0: endpoint {

				remote-endpoint = <&ov2640_0>;

				bus-width = <8>;

			};

		};

	};

	i2c1: i2c@f0018000 {

		ov2640: camera@0x30 {

			compatible = "omnivision,ov2640";

			reg = <0x30>;

			port {

				ov2640_0: endpoint {

					remote-endpoint = <&isi_0>;

					bus-width = <8>;

				};

			};

		};

	};

#include <media/atmel-isi.h>

#include <media/soc_camera.h>

#include <media/soc_mediabus.h>

#include <media/v4l2-of.h>

#include <media/videobuf2-dma-contig.h>

#define MAX_BUFFER_NUM			32

#define VID_LIMIT_BYTES			(16 * 1024 * 1024)

#define MIN_FRAME_RATE			15

#define FRAME_INTERVAL_MILLI_SEC	(1000 / MIN_FRAME_RATE)

#define ISI_DEFAULT_MCLK_FREQ		25000000

/* Frame buffer descriptor */

struct fbd {

	return 0;

}

static int atmel_isi_probe_dt(struct atmel_isi *isi,

			struct platform_device *pdev)

{

	struct device_node *np= pdev->dev.of_node;

	struct v4l2_of_endpoint ep;

	int err;

	/* Default settings for ISI */

	isi->pdata.full_mode = 1;

	isi->pdata.mck_hz = ISI_DEFAULT_MCLK_FREQ;

	isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL;

	np = of_graph_get_next_endpoint(np, NULL);

	if (!np) {

		dev_err(&pdev->dev, "Could not find the endpoint\n");

		return -EINVAL;

	}

	err = v4l2_of_parse_endpoint(np, &ep);

	if (err) {

		dev_err(&pdev->dev, "Could not parse the endpoint\n");

		goto err_probe_dt;

	}

	switch (ep.bus.parallel.bus_width) {

	case 8:

		isi->pdata.data_width_flags = ISI_DATAWIDTH_8;

		break;

	case 10:

		isi->pdata.data_width_flags =

				ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10;

		break;

	default:

		dev_err(&pdev->dev, "Unsupported bus width: %d\n",

				ep.bus.parallel.bus_width);

		err = -EINVAL;

		goto err_probe_dt;

	}

err_probe_dt:

	of_node_put(np);

	return err;

}

static int atmel_isi_probe(struct platform_device *pdev)

{

	unsigned int irq;

	struct isi_platform_data *pdata;

	pdata = dev->platform_data;

	if (!pdata || !pdata->data_width_flags) {

	if ((!pdata || !pdata->data_width_flags) && !pdev->dev.of_node) {

		dev_err(&pdev->dev,

			"No config available for Atmel ISI\n");

		return -EINVAL;

	if (IS_ERR(isi->pclk))

		return PTR_ERR(isi->pclk);

	if (pdata) {

		memcpy(&isi->pdata, pdata, sizeof(isi->pdata));

	} else {

		ret = atmel_isi_probe_dt(isi, pdev);

		if (ret)

			return ret;

	}

	isi->active = NULL;

	spin_lock_init(&isi->lock);

	INIT_LIST_HEAD(&isi->video_buffer_list);

	return ret;

}

static const struct of_device_id atmel_isi_of_match[] = {

	{ .compatible = "atmel,at91sam9g45-isi" },

	{ }

};

MODULE_DEVICE_TABLE(of, atmel_isi_of_match);

static struct platform_driver atmel_isi_driver = {

	.remove		= atmel_isi_remove,

	.driver		= {

		.name = "atmel_isi",

		.owner = THIS_MODULE,

		.of_match_table = of_match_ptr(atmel_isi_of_match),

	},

};