Source of trf7970a.c - linux-imx - PHYTEC BitBucket (Stash)

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    }
​
    of_property_read_u32(np, "clock-frequency", &clk_freq);
    if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) &&
        (clk_freq != TRF7970A_13MHZ_CLOCK_FREQUENCY)) {
        dev_err(trf->dev,
            "clock-frequency (%u Hz) unsupported\n", clk_freq);
        return -EINVAL;
    }
​
    if (clk_freq == TRF7970A_27MHZ_CLOCK_FREQUENCY) {
        trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_27MHZ;
        dev_dbg(trf->dev, "trf7970a configured for 27MHz crystal\n");
    } else {
        trf->modulator_sys_clk_ctrl = 0;
    }
​
    ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL,
                    trf7970a_irq,
                    IRQF_TRIGGER_RISING | IRQF_ONESHOT,
                    "trf7970a", trf);
    if (ret) {
        dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret);
        return ret;
    }
​
    mutex_init(&trf->lock);