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ASoC: Tegra I2S: Add device tree binding 

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Stephen Warren 2011-11-29 18:36:48 -07:00 committed by Mark Brown
parent b00adf76a6
commit bf55499e6e
2 changed files with 39 additions and 5 deletions
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17
Documentation/devicetree/bindings/sound/tegra20-i2s.txt Normal file
View File

@ -0,0 +1,17 @@
NVIDIA Tegra 20 I2S controller
Required properties:
- compatible : "nvidia,tegra20-i2s"
- reg : Should contain I2S registers location and length
- interrupts : Should contain I2S interrupt
- nvidia,dma-request-selector : The Tegra DMA controller's phandle and
request selector for this I2S controller
Example:
i2s@70002800 {
compatible = "nvidia,tegra20-i2s";
reg = <0x70002800 0x200>;
interrupts = < 45 >;
nvidia,dma-request-selector = < &apbdma 2 >;
};

27
sound/soc/tegra/tegra_i2s.c
View File

@ -36,6 +36,7 @@
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/of.h>
#include <mach/iomap.h>
#include <sound/core.h>
#include <sound/pcm.h>
@ -331,6 +332,8 @@ static __devinit int tegra_i2s_platform_probe(struct platform_device *pdev)
{
struct tegra_i2s * i2s;
struct resource *mem, *memregion, *dmareq;
u32 of_dma[2];
u32 dma_ch;
int ret;
i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra_i2s), GFP_KERNEL);
@ -360,9 +363,16 @@ static __devinit int tegra_i2s_platform_probe(struct platform_device *pdev)
dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (!dmareq) {
dev_err(&pdev->dev, "No DMA resource\n");
ret = -ENODEV;
goto err_clk_put;
if (of_property_read_u32_array(pdev->dev.of_node,
"nvidia,dma-request-selector",
of_dma, 2) < 0) {
dev_err(&pdev->dev, "No DMA resource\n");
ret = -ENODEV;
goto err_clk_put;
}
dma_ch = of_dma[1];
} else {
dma_ch = dmareq->start;
}
memregion = devm_request_mem_region(&pdev->dev, mem->start,
@ -383,12 +393,12 @@ static __devinit int tegra_i2s_platform_probe(struct platform_device *pdev)
i2s->capture_dma_data.addr = mem->start + TEGRA_I2S_FIFO2;
i2s->capture_dma_data.wrap = 4;
i2s->capture_dma_data.width = 32;
i2s->capture_dma_data.req_sel = dmareq->start;
i2s->capture_dma_data.req_sel = dma_ch;
i2s->playback_dma_data.addr = mem->start + TEGRA_I2S_FIFO1;
i2s->playback_dma_data.wrap = 4;
i2s->playback_dma_data.width = 32;
i2s->playback_dma_data.req_sel = dmareq->start;
i2s->playback_dma_data.req_sel = dma_ch;
i2s->reg_ctrl = TEGRA_I2S_CTRL_FIFO_FORMAT_PACKED;
@ -422,10 +432,16 @@ static int __devexit tegra_i2s_platform_remove(struct platform_device *pdev)
return 0;
}
static const struct of_device_id tegra_i2s_of_match[] __devinitconst = {
{ .compatible = "nvidia,tegra20-i2s", },
{},
};
static struct platform_driver tegra_i2s_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
.of_match_table = tegra_i2s_of_match,
},
.probe = tegra_i2s_platform_probe,
.remove = __devexit_p(tegra_i2s_platform_remove),
@ -436,3 +452,4 @@ MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
MODULE_DESCRIPTION("Tegra I2S ASoC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
MODULE_DEVICE_TABLE(of, tegra_i2s_of_match);