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authorShawn Guo <shawn.guo@linaro.org>2012-05-11 22:24:17 +0800
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-05-12 11:04:59 +0100
commit08641c7c74dddfcd726512edfaa3b4cbe42e523e (patch)
treea90c3c70a2dc4a57d3f227d9b93c8f953eed9f34 /sound/soc/mxs/mxs-saif.c
parent4da3fe7851f9288c2479186d390b0de28d51bdb0 (diff)
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>
Diffstat (limited to 'sound/soc/mxs/mxs-saif.c')
-rw-r--r--sound/soc/mxs/mxs-saif.c72
1 files changed, 54 insertions, 18 deletions
diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c
index 356aad83c1fe..064274880673 100644
--- a/sound/soc/mxs/mxs-saif.c
+++ b/sound/soc/mxs/mxs-saif.c
@@ -18,6 +18,8 @@
#include <linux/module.h>
#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
@@ -622,34 +624,54 @@ static irqreturn_t mxs_saif_irq(int irq, void *dev_id)
static int __devinit mxs_saif_probe(struct platform_device *pdev)
{
+ struct device_node *np = pdev->dev.of_node;
struct resource *iores, *dmares;
struct mxs_saif *saif;
struct mxs_saif_platform_data *pdata;
int ret = 0;
- if (pdev->id >= ARRAY_SIZE(mxs_saif))
+
+ if (!np && pdev->id >= ARRAY_SIZE(mxs_saif))
return -EINVAL;
saif = devm_kzalloc(&pdev->dev, sizeof(*saif), GFP_KERNEL);
if (!saif)
return -ENOMEM;
- mxs_saif[pdev->id] = saif;
- saif->id = pdev->id;
-
- pdata = pdev->dev.platform_data;
- if (pdata && !pdata->master_mode) {
- saif->master_id = pdata->master_id;
- if (saif->master_id < 0 ||
- saif->master_id >= ARRAY_SIZE(mxs_saif) ||
- saif->master_id == saif->id) {
- dev_err(&pdev->dev, "get wrong master id\n");
- return -EINVAL;
+ if (np) {
+ struct device_node *master;
+ saif->id = of_alias_get_id(np, "saif");
+ if (saif->id < 0)
+ return saif->id;
+ /*
+ * If there is no "fsl,saif-master" phandle, it's a saif
+ * master. Otherwise, it's a slave and its phandle points
+ * to the master.
+ */
+ master = of_parse_phandle(np, "fsl,saif-master", 0);
+ if (!master) {
+ saif->master_id = saif->id;
+ } else {
+ saif->master_id = of_alias_get_id(master, "saif");
+ if (saif->master_id < 0)
+ return saif->master_id;
}
} else {
- saif->master_id = saif->id;
+ saif->id = pdev->id;
+ pdata = pdev->dev.platform_data;
+ if (pdata && !pdata->master_mode)
+ saif->master_id = pdata->master_id;
+ else
+ saif->master_id = saif->id;
+ }
+
+ if (saif->master_id < 0 || saif->master_id >= ARRAY_SIZE(mxs_saif)) {
+ dev_err(&pdev->dev, "get wrong master id\n");
+ return -EINVAL;
}
+ mxs_saif[saif->id] = saif;
+
saif->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(saif->clk)) {
ret = PTR_ERR(saif->clk);
@@ -669,12 +691,19 @@ static int __devinit mxs_saif_probe(struct platform_device *pdev)
dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (!dmares) {
- ret = -ENODEV;
- dev_err(&pdev->dev, "failed to get dma resource: %d\n",
- ret);
- goto failed_get_resource;
+ /*
+ * TODO: This is a temporary solution and should be changed
+ * to use generic DMA binding later when the helplers get in.
+ */
+ ret = of_property_read_u32(np, "fsl,saif-dma-channel",
+ &saif->dma_param.chan_num);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to get dma channel\n");
+ goto failed_get_resource;
+ }
+ } else {
+ saif->dma_param.chan_num = dmares->start;
}
- saif->dma_param.chan_num = dmares->start;
saif->irq = platform_get_irq(pdev, 0);
if (saif->irq < 0) {
@@ -735,6 +764,12 @@ static int __devexit mxs_saif_remove(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id mxs_saif_dt_ids[] = {
+ { .compatible = "fsl,imx28-saif", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mxs_saif_dt_ids);
+
static struct platform_driver mxs_saif_driver = {
.probe = mxs_saif_probe,
.remove = __devexit_p(mxs_saif_remove),
@@ -742,6 +777,7 @@ static struct platform_driver mxs_saif_driver = {
.driver = {
.name = "mxs-saif",
.owner = THIS_MODULE,
+ .of_match_table = mxs_saif_dt_ids,
},
};