Source of mailbox-test.c - linux-imx - PHYTEC BitBucket (Stash)

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    struct resource *res;
    resource_size_t size;
    int ret;
​
    tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL);
    if (!tdev)
        return -ENOMEM;
​
    /* It's okay for MMIO to be NULL */
    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    size = resource_size(res);
    tdev->tx_mmio = devm_ioremap_resource(&pdev->dev, res);
    if (PTR_ERR(tdev->tx_mmio) == -EBUSY)
    if (PTR_ERR(tdev->tx_mmio) == -EBUSY) {
        /* if reserved area in SRAM, try just ioremap */
        size = resource_size(res);
        tdev->tx_mmio = devm_ioremap(&pdev->dev, res->start, size);
    else if (IS_ERR(tdev->tx_mmio))
    } else if (IS_ERR(tdev->tx_mmio)) {
        tdev->tx_mmio = NULL;
    }
​
    /* If specified, second reg entry is Rx MMIO */
    res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
    size = resource_size(res);
    tdev->rx_mmio = devm_ioremap_resource(&pdev->dev, res);
    if (PTR_ERR(tdev->rx_mmio) == -EBUSY)
    if (PTR_ERR(tdev->rx_mmio) == -EBUSY) {
        size = resource_size(res);
        tdev->rx_mmio = devm_ioremap(&pdev->dev, res->start, size);
    else if (IS_ERR(tdev->rx_mmio))
    } else if (IS_ERR(tdev->rx_mmio)) {
        tdev->rx_mmio = tdev->tx_mmio;
    }
​
    tdev->tx_channel = mbox_test_request_channel(pdev, "tx");
    tdev->rx_channel = mbox_test_request_channel(pdev, "rx");
​
    if (!tdev->tx_channel && !tdev->rx_channel)
        return -EPROBE_DEFER;
​
    /* If Rx is not specified but has Rx MMIO, then Rx = Tx */
    if (!tdev->rx_channel && (tdev->rx_mmio != tdev->tx_mmio))
        tdev->rx_channel = tdev->tx_channel;