Source of spi-tegra20-slink.c - linux-imx

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        ret = -ENODEV;
        goto exit_free_master;
    }
    tspi->phys = r->start;
    tspi->base = devm_ioremap_resource(&pdev->dev, r);
    if (IS_ERR(tspi->base)) {
        ret = PTR_ERR(tspi->base);
        goto exit_free_master;
    }
​
    /* disabled clock may cause interrupt storm upon request */
    tspi->clk = devm_clk_get(&pdev->dev, NULL);
    if (IS_ERR(tspi->clk)) {
        ret = PTR_ERR(tspi->clk);
        dev_err(&pdev->dev, "Can not get clock %d\n", ret);
        goto exit_free_master;
    }
    ret = clk_prepare(tspi->clk);
    if (ret < 0) {
        dev_err(&pdev->dev, "Clock prepare failed %d\n", ret);
        goto exit_free_master;
    }
    ret = clk_enable(tspi->clk);
    if (ret < 0) {
        dev_err(&pdev->dev, "Clock enable failed %d\n", ret);
        goto exit_free_master;
    }
​
    spi_irq = platform_get_irq(pdev, 0);
    tspi->irq = spi_irq;
    ret = request_threaded_irq(tspi->irq, tegra_slink_isr,
            tegra_slink_isr_thread, IRQF_ONESHOT,
            dev_name(&pdev->dev), tspi);
    if (ret < 0) {
        dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n",
                    tspi->irq);
        goto exit_free_master;
    }
​
    tspi->clk = devm_clk_get(&pdev->dev, NULL);
    if (IS_ERR(tspi->clk)) {
        dev_err(&pdev->dev, "can not get clock\n");
        ret = PTR_ERR(tspi->clk);
        goto exit_free_irq;
        goto exit_clk_disable;
    }
​
    tspi->rst = devm_reset_control_get_exclusive(&pdev->dev, "spi");
    if (IS_ERR(tspi->rst)) {
        dev_err(&pdev->dev, "can not get reset\n");
        ret = PTR_ERR(tspi->rst);
        goto exit_free_irq;
    }
​
    tspi->max_buf_size = SLINK_FIFO_DEPTH << 2;
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​
exit_pm_disable:
    pm_runtime_disable(&pdev->dev);
    if (!pm_runtime_status_suspended(&pdev->dev))
        tegra_slink_runtime_suspend(&pdev->dev);
    tegra_slink_deinit_dma_param(tspi, false);
exit_rx_dma_free:
    tegra_slink_deinit_dma_param(tspi, true);
exit_free_irq:
    free_irq(spi_irq, tspi);
exit_clk_disable:
    clk_disable(tspi->clk);
exit_free_master:
    spi_master_put(master);
    return ret;
}
​
static int tegra_slink_remove(struct platform_device *pdev)
{
    struct spi_master *master = platform_get_drvdata(pdev);
    struct tegra_slink_data *tspi = spi_master_get_devdata(master);
​
    free_irq(tspi->irq, tspi);
​
    clk_disable(tspi->clk);
​
    if (tspi->tx_dma_chan)
        tegra_slink_deinit_dma_param(tspi, false);
​
    if (tspi->rx_dma_chan)
        tegra_slink_deinit_dma_param(tspi, true);
​
    pm_runtime_disable(&pdev->dev);
    if (!pm_runtime_status_suspended(&pdev->dev))
        tegra_slink_runtime_suspend(&pdev->dev);
​