From: Marcus Cooper <codekip...@gmail.com>
Newer SoCs have additional functionality so a quirks structure
has been added to handle them. So far we've seen the use of a
reset controller, a different address for the TXFIFO and varying
register changes.
This patch prepares the driver for these changes and adds the
reset specifier.
Signed-off-by: Marcus Cooper <codekip...@gmail.com>
---
.../devicetree/bindings/sound/sun4i-i2s.txt | 2 +
sound/soc/sunxi/sun4i-i2s.c | 47 ++++++++++++++++++++--
2 files changed, 45 insertions(+), 4 deletions(-)
diff --git a/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
b/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
index 7a2c0945fd22..494a881ccd21 100644
--- a/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
+++ b/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
@@ -18,6 +18,8 @@ Required properties:
- "apb" : clock for the I2S bus interface
- "mod" : module clock for the I2S controller
- #sound-dai-cells : Must be equal to 0
+- resets: reset specifier for the ahb reset (A31 and newer only)
+
Example:
diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
index f24d19526603..80fe4f1d6e3b 100644
--- a/sound/soc/sunxi/sun4i-i2s.c
+++ b/sound/soc/sunxi/sun4i-i2s.c
@@ -14,9 +14,11 @@
#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/module.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
+#include <linux/reset.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>
@@ -92,6 +94,7 @@ struct sun4i_i2s {
struct clk *bus_clk;
struct clk *mod_clk;
struct regmap *regmap;
+ struct reset_control *rst;
unsigned int mclk_freq;
@@ -104,6 +107,13 @@ struct sun4i_i2s_clk_div {
u8 val;
};
+struct sun4i_i2s_quirks {
+ unsigned int reg_dac_txdata; /* TX FIFO offset for DMA config */
+ bool has_reset;
+ const struct regmap_config *sun4i_i2s_regmap;
+ const struct snd_soc_dai_ops *ops;
+};
+
static const struct sun4i_i2s_clk_div sun4i_i2s_bclk_div[] = {
{ .div = 2, .val = 0 },
{ .div = 4, .val = 1 },
@@ -541,7 +551,6 @@ static struct snd_soc_dai_driver sun4i_i2s_dai = {
.rates = SNDRV_PCM_RATE_8000_192000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
- .ops = &sun4i_i2s_dai_ops,
.symmetric_rates = 1,
};
@@ -655,6 +664,7 @@ static int sun4i_i2s_probe(struct platform_device *pdev)
{
struct sun4i_i2s *i2s;
struct resource *res;
+ const struct sun4i_i2s_quirks *quirks;
void __iomem *regs;
int irq, ret;
@@ -680,8 +690,14 @@ static int sun4i_i2s_probe(struct platform_device *pdev)
return PTR_ERR(i2s->bus_clk);
}
+ quirks = of_device_get_match_data(&pdev->dev);
+ if (quirks == NULL) {
+ dev_err(&pdev->dev, "Failed to determine the quirks to use\n");
+ return -ENODEV;
+ }
+
i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
- &sun4i_i2s_regmap_config);
+ quirks->sun4i_i2s_regmap);
if (IS_ERR(i2s->regmap)) {
dev_err(&pdev->dev, "Regmap initialisation failed\n");
return PTR_ERR(i2s->regmap);
@@ -692,13 +708,25 @@ static int sun4i_i2s_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "Can't get our mod clock\n");
return PTR_ERR(i2s->mod_clk);
}
+
- i2s->playback_dma_data.addr = res->start + SUN4I_I2S_FIFO_TX_REG;
+ i2s->playback_dma_data.addr = res->start + quirks->reg_dac_txdata;
i2s->playback_dma_data.maxburst = 4;
i2s->capture_dma_data.addr = res->start + SUN4I_I2S_FIFO_RX_REG;
i2s->capture_dma_data.maxburst = 4;
+ if (quirks->has_reset) {
+ i2s->rst = devm_reset_control_get_optional(&pdev->dev, NULL);
+ if (IS_ERR(i2s->rst) && PTR_ERR(i2s->rst) == -EPROBE_DEFER) {
+ ret = -EPROBE_DEFER;
+ dev_err(&pdev->dev, "Failed to get reset: %d\n", ret);
+ goto err_pm_disable;
+ }
+ if (!IS_ERR(i2s->rst))
+ reset_control_deassert(i2s->rst);
+ }
+
pm_runtime_enable(&pdev->dev);
if (!pm_runtime_enabled(&pdev->dev)) {
ret = sun4i_i2s_runtime_resume(&pdev->dev);
@@ -706,6 +734,8 @@ static int sun4i_i2s_probe(struct platform_device *pdev)
goto err_pm_disable;
}
+ /* Register ops with dai */
+ sun4i_i2s_dai.ops = quirks->ops;
ret = devm_snd_soc_register_component(&pdev->dev,
&sun4i_i2s_component,
&sun4i_i2s_dai, 1);
@@ -742,8 +772,17 @@ static int sun4i_i2s_remove(struct platform_device *pdev)
return 0;
}
+static const struct sun4i_i2s_quirks sun4i_a10_i2s_quirks = {
+ .reg_dac_txdata = SUN4I_I2S_FIFO_TX_REG,
+ .sun4i_i2s_regmap = &sun4i_i2s_regmap_config,
+ .ops = &sun4i_i2s_dai_ops,
+};
+
static const struct of_device_id sun4i_i2s_match[] = {
- { .compatible = "allwinner,sun4i-a10-i2s", },
+ {
+ .compatible = "allwinner,sun4i-a10-i2s",
+ .data = &sun4i_a10_i2s_quirks,
+ },
{}
};
MODULE_DEVICE_TABLE(of, sun4i_i2s_match);
--
2.11.0
