On 07/25/2014 09:33 AM, Nicolin Chen wrote:
The Asynchronous Sample Rate Converter (ASRC) converts the sampling rate of a signal associated with an input clock into a signal associated with a different output clock. The driver currently works as a Front End of DPCM with other Back Ends DAI links such as ESAI<->CS42888 and SSI<->WM8962 and SAI. It converts the original sample rate to a common rate supported by Back Ends for playback while converts the common rate of Back Ends to a desired rate for capture. It has 3 pairs to support three different substreams within totally 10 channels.
(...)
+Required properties:
- compatible : Compatible list, must contain "fsl,imx35-asrc" or
- "fsl,imx53-asrc".
- reg : Offset and length of the register set for the device.
- interrupts : Contains the spdif interrupt.
- dmas : Generic dma devicetree binding as described in
Documentation/devicetree/bindings/dma/dma.txt.
- dma-names : Six dmas have to be defined: "rxa", "rxb", "rxc", "txa", "txb",
and "txc".
- clocks : Contains an entry for each entry in clock-names.
- clock-names : Includes the following entries:
- "mem" Peripheral access clock to access registers.
- "ipg" Peripheral clock to driver module.
- "asrck_<0-f>" Clock sources for input and output clock.
- big-endian : If this property is absent, the native endian mode will
be in use as default, or the big endian mode will be in usefor all the device registers.
- fsl,asrc-rate : Defines a mutual sample rate used by Back End DAI link.
- fsl,asrc-width : Defines a mutual sample width used by Back End DAI link.
indentation for the properties....
- compatible : Should be "fsl,imx35-asrc" or "fsl,imx53-asrc". - reg : Offset and length of the register set for the device. ....
(...)
+static const struct platform_device_id fsl_asrc_devtype[] = {
- {
.name = "imx35-asrc",.driver_data = IMX35_ASRC,- }, {
.name = "imx53-asrc",.driver_data = IMX53_ASRC,- }, {
/* sentinel */- }
+}; +MODULE_DEVICE_TABLE(platform, fsl_asrc_devtype);
+static const struct of_device_id fsl_asrc_ids[] = {
- {
.compatible = "fsl,imx35-asrc",.data = &fsl_asrc_devtype[IMX35_ASRC],- }, {
.compatible = "fsl,imx53-asrc",.data = &fsl_asrc_devtype[IMX53_ASRC],- }, {
/* sentinel */- }
+}; +MODULE_DEVICE_TABLE(of, fsl_asrc_ids);
move these ids after probe/remove... every driver follows same thing...
+static irqreturn_t fsl_asrc_isr(int irq, void *dev_id) +{
- struct fsl_asrc *asrc_priv = (struct fsl_asrc *)dev_id;
- struct device *dev = &asrc_priv->pdev->dev;
- enum asrc_pair_index index;
- u32 status;
- regmap_read(asrc_priv->regmap, REG_ASRSTR, &status);
- /* Clean overload error */
- regmap_write(asrc_priv->regmap, REG_ASRSTR, ASRSTR_AOLE);
- /*
* We here use dev_dbg() for all exceptions because ASRC itself does* not care if FIFO overflowed or underrun while a warning in the* interrupt would result a ridged conversion.*/- for (index = ASRC_PAIR_A; index < ASRC_PAIR_MAX_NUM; index++) {
if (!asrc_priv->pair[index])continue;if (status & ASRSTR_ATQOL) {asrc_priv->pair[index]->error |= ASRC_TASK_Q_OVERLOAD;dev_dbg(dev, "ASRC Task Queue FIFO overload");
missed terminating new line (\n)...
}if (status & ASRSTR_AOOL(index)) {asrc_priv->pair[index]->error |= ASRC_OUTPUT_TASK_OVERLOAD;pair_dbg("Output Task Overload");
same
}if (status & ASRSTR_AIOL(index)) {asrc_priv->pair[index]->error |= ASRC_INPUT_TASK_OVERLOAD;pair_dbg("Input Task Overload");
same
}if (status & ASRSTR_AODO(index)) {asrc_priv->pair[index]->error |= ASRC_OUTPUT_BUFFER_OVERFLOW;pair_dbg("Output Data Buffer has overflowed");
same
}if (status & ASRSTR_AIDU(index)) {asrc_priv->pair[index]->error |= ASRC_INPUT_BUFFER_UNDERRUN;pair_dbg("Input Data Buffer has underflowed");
same..
}- }
- return IRQ_HANDLED;
+}
(...)
+/**
- Configure input and output thresholds
- */
+static int fsl_asrc_set_watermarks(struct fsl_asrc_pair *pair, u32 in, u32 out) +{
static void for function..?
- struct fsl_asrc *asrc_priv = pair->asrc_priv;
- enum asrc_pair_index index = pair->index;
- regmap_update_bits(asrc_priv->regmap, REG_ASRMCR(index),
ASRMCRi_EXTTHRSHi_MASK |ASRMCRi_INFIFO_THRESHOLD_MASK |ASRMCRi_OUTFIFO_THRESHOLD_MASK,ASRMCRi_EXTTHRSHi |ASRMCRi_INFIFO_THRESHOLD(in) |ASRMCRi_OUTFIFO_THRESHOLD(out));- return 0;
+}
(...)
+static const struct dev_pm_ops fsl_asrc_pm = {
- SET_RUNTIME_PM_OPS(fsl_asrc_runtime_suspend, fsl_asrc_runtime_resume, NULL)
- SET_SYSTEM_SLEEP_PM_OPS(fsl_asrc_suspend, fsl_asrc_resume)
+};
move device ids to here...
+static struct platform_driver fsl_asrc_driver = {
- .probe = fsl_asrc_probe,
- .driver = {
.name = "fsl-asrc",.of_match_table = fsl_asrc_ids,.pm = &fsl_asrc_pm,- },
+}; +module_platform_driver(fsl_asrc_driver);
Thanks...