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ASoC: axi-i2s: let both capture and playback be optional 

Both the capture and playback channels are optional in the axi_i2s IP
block. Reflect this in the driver by enabling only the channel(s) that
have a DMA.

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Luca Ceresoli 2019-03-07 22:44:55 +01:00 committed by Mark Brown
parent 7d7b25d05e
commit 7bf7d05548
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 48 additions and 20 deletions
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68
sound/soc/adi/axi-i2s.c
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@ -43,6 +43,9 @@ struct axi_i2s {
struct clk *clk;
struct clk *clk_ref;
bool has_capture;
bool has_playback;
struct snd_soc_dai_driver dai_driver;
struct snd_dmaengine_dai_dma_data capture_dma_data;
@ -136,8 +139,10 @@ static int axi_i2s_dai_probe(struct snd_soc_dai *dai)
{
struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
snd_soc_dai_init_dma_data(dai, &i2s->playback_dma_data,
&i2s->capture_dma_data);
snd_soc_dai_init_dma_data(
dai,
i2s->has_playback ? &i2s->playback_dma_data : NULL,
i2s->has_capture ? &i2s->capture_dma_data : NULL);
return 0;
}
@ -151,18 +156,6 @@ static const struct snd_soc_dai_ops axi_i2s_dai_ops = {
static struct snd_soc_dai_driver axi_i2s_dai = {
.probe = axi_i2s_dai_probe,
.playback = {
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_KNOT,
.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE,
},
.capture = {
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_KNOT,
.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE,
},
.ops = &axi_i2s_dai_ops,
.symmetric_rates = 1,
};
@ -178,6 +171,19 @@ static const struct regmap_config axi_i2s_regmap_config = {
.max_register = AXI_I2S_REG_STATUS,
};
static void axi_i2s_parse_of(struct axi_i2s *i2s, const struct device_node *np)
{
struct property *dma_names;
const char *dma_name;
of_property_for_each_string(np, "dma-names", dma_names, dma_name) {
if (strcmp(dma_name, "rx") == 0)
i2s->has_capture = true;
if (strcmp(dma_name, "tx") == 0)
i2s->has_playback = true;
}
}
static int axi_i2s_probe(struct platform_device *pdev)
{
struct resource *res;
@ -191,6 +197,8 @@ static int axi_i2s_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, i2s);
axi_i2s_parse_of(i2s, pdev->dev.of_node);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
@ -213,13 +221,29 @@ static int axi_i2s_probe(struct platform_device *pdev)
if (ret)
return ret;
i2s->playback_dma_data.addr = res->start + AXI_I2S_REG_TX_FIFO;
i2s->playback_dma_data.addr_width = 4;
i2s->playback_dma_data.maxburst = 1;
if (i2s->has_playback) {
axi_i2s_dai.playback.channels_min = 2;
axi_i2s_dai.playback.channels_max = 2;
axi_i2s_dai.playback.rates = SNDRV_PCM_RATE_KNOT;
axi_i2s_dai.playback.formats =
SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE;
i2s->capture_dma_data.addr = res->start + AXI_I2S_REG_RX_FIFO;
i2s->capture_dma_data.addr_width = 4;
i2s->capture_dma_data.maxburst = 1;
i2s->playback_dma_data.addr = res->start + AXI_I2S_REG_TX_FIFO;
i2s->playback_dma_data.addr_width = 4;
i2s->playback_dma_data.maxburst = 1;
}
if (i2s->has_capture) {
axi_i2s_dai.capture.channels_min = 2;
axi_i2s_dai.capture.channels_max = 2;
axi_i2s_dai.capture.rates = SNDRV_PCM_RATE_KNOT;
axi_i2s_dai.capture.formats =
SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE;
i2s->capture_dma_data.addr = res->start + AXI_I2S_REG_RX_FIFO;
i2s->capture_dma_data.addr_width = 4;
i2s->capture_dma_data.maxburst = 1;
}
i2s->ratnum.num = clk_get_rate(i2s->clk_ref) / 2 / AXI_I2S_BITS_PER_FRAME;
i2s->ratnum.den_step = 1;
@ -240,6 +264,10 @@ static int axi_i2s_probe(struct platform_device *pdev)
if (ret)
goto err_clk_disable;
dev_info(&pdev->dev, "probed, capture %s, playback %s\n",
i2s->has_capture ? "enabled" : "disabled",
i2s->has_playback ? "enabled" : "disabled");
return 0;
err_clk_disable: