ASoC: mxs: add device tree support for mxs-saif
Add device tree probe for mxs-saif driver. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Shawn Guo
Mark Brown
parent
4da3fe7851
commit
08641c7c74
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@ -0,0 +1,36 @@
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* Freescale MXS Serial Audio Interface (SAIF)
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Required properties:
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- compatible: Should be "fsl,<chip>-saif"
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- reg: Should contain registers location and length
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- interrupts: Should contain ERROR and DMA interrupts
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- fsl,saif-dma-channel: APBX DMA channel for the SAIF
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Optional properties:
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- fsl,saif-master: phandle to the master SAIF. It's only required for
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the slave SAIF.
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Note: Each SAIF controller should have an alias correctly numbered
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in "aliases" node.
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Example:
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aliases {
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saif0 = &saif0;
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saif1 = &saif1;
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};
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saif0: saif@80042000 {
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compatible = "fsl,imx28-saif";
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reg = <0x80042000 2000>;
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interrupts = <59 80>;
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fsl,saif-dma-channel = <4>;
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};
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saif1: saif@80046000 {
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compatible = "fsl,imx28-saif";
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reg = <0x80046000 2000>;
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interrupts = <58 81>;
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fsl,saif-dma-channel = <5>;
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fsl,saif-master = <&saif0>;
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};
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@ -18,6 +18,8 @@
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/dma-mapping.h>
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@ -622,34 +624,54 @@ static irqreturn_t mxs_saif_irq(int irq, void *dev_id)
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static int __devinit mxs_saif_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct resource *iores, *dmares;
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struct mxs_saif *saif;
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struct mxs_saif_platform_data *pdata;
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int ret = 0;
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if (pdev->id >= ARRAY_SIZE(mxs_saif))
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if (!np && pdev->id >= ARRAY_SIZE(mxs_saif))
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return -EINVAL;
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saif = devm_kzalloc(&pdev->dev, sizeof(*saif), GFP_KERNEL);
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if (!saif)
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return -ENOMEM;
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mxs_saif[pdev->id] = saif;
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saif->id = pdev->id;
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pdata = pdev->dev.platform_data;
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if (pdata && !pdata->master_mode) {
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saif->master_id = pdata->master_id;
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if (saif->master_id < 0 ||
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saif->master_id >= ARRAY_SIZE(mxs_saif) ||
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saif->master_id == saif->id) {
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dev_err(&pdev->dev, "get wrong master id\n");
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return -EINVAL;
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if (np) {
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struct device_node *master;
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saif->id = of_alias_get_id(np, "saif");
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if (saif->id < 0)
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return saif->id;
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/*
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* If there is no "fsl,saif-master" phandle, it's a saif
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* master. Otherwise, it's a slave and its phandle points
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* to the master.
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*/
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master = of_parse_phandle(np, "fsl,saif-master", 0);
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if (!master) {
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saif->master_id = saif->id;
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} else {
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saif->master_id = of_alias_get_id(master, "saif");
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if (saif->master_id < 0)
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return saif->master_id;
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}
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} else {
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saif->master_id = saif->id;
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saif->id = pdev->id;
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pdata = pdev->dev.platform_data;
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if (pdata && !pdata->master_mode)
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saif->master_id = pdata->master_id;
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else
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saif->master_id = saif->id;
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}
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if (saif->master_id < 0 || saif->master_id >= ARRAY_SIZE(mxs_saif)) {
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dev_err(&pdev->dev, "get wrong master id\n");
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return -EINVAL;
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}
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mxs_saif[saif->id] = saif;
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saif->clk = clk_get(&pdev->dev, NULL);
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if (IS_ERR(saif->clk)) {
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ret = PTR_ERR(saif->clk);
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@ -669,12 +691,19 @@ static int __devinit mxs_saif_probe(struct platform_device *pdev)
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dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
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if (!dmares) {
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ret = -ENODEV;
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dev_err(&pdev->dev, "failed to get dma resource: %d\n",
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ret);
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goto failed_get_resource;
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/*
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* TODO: This is a temporary solution and should be changed
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* to use generic DMA binding later when the helplers get in.
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*/
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ret = of_property_read_u32(np, "fsl,saif-dma-channel",
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&saif->dma_param.chan_num);
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if (ret) {
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dev_err(&pdev->dev, "failed to get dma channel\n");
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goto failed_get_resource;
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}
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} else {
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saif->dma_param.chan_num = dmares->start;
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}
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saif->dma_param.chan_num = dmares->start;
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saif->irq = platform_get_irq(pdev, 0);
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if (saif->irq < 0) {
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@ -735,6 +764,12 @@ static int __devexit mxs_saif_remove(struct platform_device *pdev)
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return 0;
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}
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static const struct of_device_id mxs_saif_dt_ids[] = {
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{ .compatible = "fsl,imx28-saif", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, mxs_saif_dt_ids);
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static struct platform_driver mxs_saif_driver = {
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.probe = mxs_saif_probe,
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.remove = __devexit_p(mxs_saif_remove),
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@ -742,6 +777,7 @@ static struct platform_driver mxs_saif_driver = {
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.driver = {
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.name = "mxs-saif",
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.owner = THIS_MODULE,
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.of_match_table = mxs_saif_dt_ids,
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},
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};
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