// SPDX-License-Identifier: GPL-2.0+
/*
 * Media driver for Freescale i.MX5/6 SOC
 *
 * Open Firmware parsing.
 *
 * Copyright (c) 2016 Mentor Graphics Inc.
 */
#include <linux/of_platform.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-subdev.h>
#include <media/videobuf2-dma-contig.h>
#include <linux/of_graph.h>
#include <video/imx-ipu-v3.h>
#include "imx-media.h"

static int imx_media_of_add_csi(struct imx_media_dev *imxmd,
                                struct device_node *csi_np)
{
        struct v4l2_async_connection *asd;
        int ret = 0;

        if (!of_device_is_available(csi_np)) {
                dev_dbg(imxmd->md.dev, "%s: %pOFn not enabled\n", __func__,
                        csi_np);
                return -ENODEV;
        }

        /* add CSI fwnode to async notifier */
        asd = v4l2_async_nf_add_fwnode(&imxmd->notifier,
                                       of_fwnode_handle(csi_np),
                                       struct v4l2_async_connection);
        if (IS_ERR(asd)) {
                ret = PTR_ERR(asd);
                if (ret == -EEXIST)
                        dev_dbg(imxmd->md.dev, "%s: already added %pOFn\n",
                                __func__, csi_np);
        }

        return ret;
}

int imx_media_add_of_subdevs(struct imx_media_dev *imxmd,
                             struct device_node *np)
{
        struct device_node *csi_np;
        int i, ret;

        for (i = 0; ; i++) {
                csi_np = of_parse_phandle(np, "ports", i);
                if (!csi_np)
                        break;

                ret = imx_media_of_add_csi(imxmd, csi_np);
                of_node_put(csi_np);
                if (ret) {
                        /* unavailable or already added is not an error */
                        if (ret == -ENODEV || ret == -EEXIST) {
                                continue;
                        }

                        /* other error, can't continue */
                        return ret;
                }
        }

        return 0;
}
EXPORT_SYMBOL_GPL(imx_media_add_of_subdevs);