[PATCH v2 0/2] ASoC: Extended SPDIF support to Allwinner A31 SoCs

[PATCH v2 0/2] ASoC: Extended SPDIF support to Allwinner A31 SoCs

[codekipper-Re5JQEeQqe8AvxtiuMwx3w]

From: Marcus Cooper <codekipper-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

This patch set extends the current support of the Allwinner SPDIF
transceiver to include the A31 SoC.

For now just the SPDIF transmitter has been tested on the Mele I7.

In order for this patch set to be functional then we require changes
to the clocks and the device tree. For those that are interested I've
pushed all the required patches here

https://github.com/codekipper/linux-sunxi/commits/a31-spdif

Thanks in advance,
CK

---
Changes since v1:
 - Corrected mistake in bindings documentation

Marcus Cooper (2):
  ASoC: sunxi: Add bindings for sun6i to SPDIF
  ASoC: sunxi: compatibility for sun6i to SPDIF

 .../devicetree/bindings/sound/sunxi,sun4i-spdif.txt     |  3 +++
 sound/soc/sunxi/sun4i-spdif.c                           | 17 ++++++++++++++++-
 2 files changed, 19 insertions(+), 1 deletion(-)

-- 
2.9.2

[PATCH v2 0/2] ASoC: Extended SPDIF support to Allwinner A31 SoCs

[codekipper]

From: Marcus Cooper <codekipper@gmail.com>

This patch set extends the current support of the Allwinner SPDIF
transceiver to include the A31 SoC.

For now just the SPDIF transmitter has been tested on the Mele I7.

In order for this patch set to be functional then we require changes
to the clocks and the device tree. For those that are interested I've
pushed all the required patches here

https://github.com/codekipper/linux-sunxi/commits/a31-spdif

Thanks in advance,
CK

---
Changes since v1:
 - Corrected mistake in bindings documentation

Marcus Cooper (2):
  ASoC: sunxi: Add bindings for sun6i to SPDIF
  ASoC: sunxi: compatibility for sun6i to SPDIF

 .../devicetree/bindings/sound/sunxi,sun4i-spdif.txt     |  3 +++
 sound/soc/sunxi/sun4i-spdif.c                           | 17 ++++++++++++++++-
 2 files changed, 19 insertions(+), 1 deletion(-)

-- 
2.9.2

[PATCH v2 0/2] ASoC: Extended SPDIF support to Allwinner A31 SoCs

[codekipper at gmail.com]

From: Marcus Cooper <codekipper@gmail.com>

This patch set extends the current support of the Allwinner SPDIF
transceiver to include the A31 SoC.

For now just the SPDIF transmitter has been tested on the Mele I7.

In order for this patch set to be functional then we require changes
to the clocks and the device tree. For those that are interested I've
pushed all the required patches here

https://github.com/codekipper/linux-sunxi/commits/a31-spdif

Thanks in advance,
CK

---
Changes since v1:
 - Corrected mistake in bindings documentation

Marcus Cooper (2):
  ASoC: sunxi: Add bindings for sun6i to SPDIF
  ASoC: sunxi: compatibility for sun6i to SPDIF

 .../devicetree/bindings/sound/sunxi,sun4i-spdif.txt     |  3 +++
 sound/soc/sunxi/sun4i-spdif.c                           | 17 ++++++++++++++++-
 2 files changed, 19 insertions(+), 1 deletion(-)

-- 
2.9.2

[PATCH v2 1/2] ASoC: sunxi: Add bindings for sun6i to SPDIF

[codekipper-Re5JQEeQqe8AvxtiuMwx3w]

From: Marcus Cooper <codekipper-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

The A31 SoC uses the same SPDIF block as found in earlier SoCs, but its
reset is controlled via a separate reset controller.

Signed-off-by: Marcus Cooper <codekipper-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt b/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
index 13503aa..0230c4d 100644
--- a/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
+++ b/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
@@ -9,6 +9,7 @@ Required properties:
 
   - compatible		: should be one of the following:
     - "allwinner,sun4i-a10-spdif": for the Allwinner A10 SoC
+    - "allwinner,sun6i-a31-spdif": for the Allwinner A31 SoC
 
   - reg			: Offset and length of the register set for the device.
 
@@ -25,6 +26,8 @@ Required properties:
 	"apb"		  clock for the spdif bus.
 	"spdif"		  clock for spdif controller.
 
+  - resets		: reset specifier for the ahb reset (A31 and newer only)
+
 Example:
 
 spdif: spdif@01c21000 {
-- 
2.9.2

[PATCH v2 1/2] ASoC: sunxi: Add bindings for sun6i to SPDIF

[codekipper]

From: Marcus Cooper <codekipper@gmail.com>

The A31 SoC uses the same SPDIF block as found in earlier SoCs, but its
reset is controlled via a separate reset controller.

Signed-off-by: Marcus Cooper <codekipper@gmail.com>
---
 Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt b/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
index 13503aa..0230c4d 100644
--- a/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
+++ b/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
@@ -9,6 +9,7 @@ Required properties:
 
   - compatible		: should be one of the following:
     - "allwinner,sun4i-a10-spdif": for the Allwinner A10 SoC
+    - "allwinner,sun6i-a31-spdif": for the Allwinner A31 SoC
 
   - reg			: Offset and length of the register set for the device.
 
@@ -25,6 +26,8 @@ Required properties:
 	"apb"		  clock for the spdif bus.
 	"spdif"		  clock for spdif controller.
 
+  - resets		: reset specifier for the ahb reset (A31 and newer only)
+
 Example:
 
 spdif: spdif@01c21000 {
-- 
2.9.2

[PATCH v2 1/2] ASoC: sunxi: Add bindings for sun6i to SPDIF

[codekipper at gmail.com]

From: Marcus Cooper <codekipper@gmail.com>

The A31 SoC uses the same SPDIF block as found in earlier SoCs, but its
reset is controlled via a separate reset controller.

Signed-off-by: Marcus Cooper <codekipper@gmail.com>
---
 Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt b/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
index 13503aa..0230c4d 100644
--- a/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
+++ b/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
@@ -9,6 +9,7 @@ Required properties:
 
   - compatible		: should be one of the following:
     - "allwinner,sun4i-a10-spdif": for the Allwinner A10 SoC
+    - "allwinner,sun6i-a31-spdif": for the Allwinner A31 SoC
 
   - reg			: Offset and length of the register set for the device.
 
@@ -25,6 +26,8 @@ Required properties:
 	"apb"		  clock for the spdif bus.
 	"spdif"		  clock for spdif controller.
 
+  - resets		: reset specifier for the ahb reset (A31 and newer only)
+
 Example:
 
 spdif: spdif at 01c21000 {
-- 
2.9.2

Applied "ASoC: sunxi: Add bindings for sun6i to SPDIF" to the asoc tree

[Mark Brown]

The patch

   ASoC: sunxi: Add bindings for sun6i to SPDIF

has been applied to the asoc tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From fbb016a25dd0f4160df90bb1319e64e8209c7619 Mon Sep 17 00:00:00 2001
From: Marcus Cooper <codekipper@gmail.com>
Date: Sat, 30 Jul 2016 17:56:37 +0200
Subject: [PATCH] ASoC: sunxi: Add bindings for sun6i to SPDIF

The A31 SoC uses the same SPDIF block as found in earlier SoCs, but its
reset is controlled via a separate reset controller.

Signed-off-by: Marcus Cooper <codekipper@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt b/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
index 13503aa505a9..0230c4d20506 100644
--- a/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
+++ b/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
@@ -9,6 +9,7 @@ Required properties:
 
   - compatible		: should be one of the following:
     - "allwinner,sun4i-a10-spdif": for the Allwinner A10 SoC
+    - "allwinner,sun6i-a31-spdif": for the Allwinner A31 SoC
 
   - reg			: Offset and length of the register set for the device.
 
@@ -25,6 +26,8 @@ Required properties:
 	"apb"		  clock for the spdif bus.
 	"spdif"		  clock for spdif controller.
 
+  - resets		: reset specifier for the ahb reset (A31 and newer only)
+
 Example:
 
 spdif: spdif@01c21000 {
-- 
2.8.1

Applied "ASoC: sunxi: Add bindings for sun6i to SPDIF" to the asoc tree

[Mark Brown]

The patch

   ASoC: sunxi: Add bindings for sun6i to SPDIF

has been applied to the asoc tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From fbb016a25dd0f4160df90bb1319e64e8209c7619 Mon Sep 17 00:00:00 2001
From: Marcus Cooper <codekipper@gmail.com>
Date: Sat, 30 Jul 2016 17:56:37 +0200
Subject: [PATCH] ASoC: sunxi: Add bindings for sun6i to SPDIF

The A31 SoC uses the same SPDIF block as found in earlier SoCs, but its
reset is controlled via a separate reset controller.

Signed-off-by: Marcus Cooper <codekipper@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt b/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
index 13503aa505a9..0230c4d20506 100644
--- a/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
+++ b/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
@@ -9,6 +9,7 @@ Required properties:
 
   - compatible		: should be one of the following:
     - "allwinner,sun4i-a10-spdif": for the Allwinner A10 SoC
+    - "allwinner,sun6i-a31-spdif": for the Allwinner A31 SoC
 
   - reg			: Offset and length of the register set for the device.
 
@@ -25,6 +26,8 @@ Required properties:
 	"apb"		  clock for the spdif bus.
 	"spdif"		  clock for spdif controller.
 
+  - resets		: reset specifier for the ahb reset (A31 and newer only)
+
 Example:
 
 spdif: spdif@01c21000 {
-- 
2.8.1

Applied "ASoC: sunxi: Add bindings for sun6i to SPDIF" to the asoc tree

[Mark Brown]

The patch

   ASoC: sunxi: Add bindings for sun6i to SPDIF

has been applied to the asoc tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From fbb016a25dd0f4160df90bb1319e64e8209c7619 Mon Sep 17 00:00:00 2001
From: Marcus Cooper <codekipper@gmail.com>
Date: Sat, 30 Jul 2016 17:56:37 +0200
Subject: [PATCH] ASoC: sunxi: Add bindings for sun6i to SPDIF

The A31 SoC uses the same SPDIF block as found in earlier SoCs, but its
reset is controlled via a separate reset controller.

Signed-off-by: Marcus Cooper <codekipper@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt b/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
index 13503aa505a9..0230c4d20506 100644
--- a/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
+++ b/Documentation/devicetree/bindings/sound/sunxi,sun4i-spdif.txt
@@ -9,6 +9,7 @@ Required properties:
 
   - compatible		: should be one of the following:
     - "allwinner,sun4i-a10-spdif": for the Allwinner A10 SoC
+    - "allwinner,sun6i-a31-spdif": for the Allwinner A31 SoC
 
   - reg			: Offset and length of the register set for the device.
 
@@ -25,6 +26,8 @@ Required properties:
 	"apb"		  clock for the spdif bus.
 	"spdif"		  clock for spdif controller.
 
+  - resets		: reset specifier for the ahb reset (A31 and newer only)
+
 Example:
 
 spdif: spdif at 01c21000 {
-- 
2.8.1

[PATCH v2 2/2] ASoC: sunxi: compatibility for sun6i to SPDIF

[codekipper-Re5JQEeQqe8AvxtiuMwx3w]

From: Marcus Cooper <codekipper-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

The A31 SoC uses the same SPDIF block as found in earlier SoCs, but its
reset is controlled via a separate reset controller.

The DMA also complains when the maxburst is set to 4 so it's been adjusted
to 8 which suites both the older and newer SoCs.

Signed-off-by: Marcus Cooper <codekipper-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 sound/soc/sunxi/sun4i-spdif.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sunxi/sun4i-spdif.c b/sound/soc/sunxi/sun4i-spdif.c
index 0b04fb0..88fbb3a 100644
--- a/sound/soc/sunxi/sun4i-spdif.c
+++ b/sound/soc/sunxi/sun4i-spdif.c
@@ -29,6 +29,7 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/reset.h>
 #include <sound/dmaengine_pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
@@ -162,6 +163,7 @@ struct sun4i_spdif_dev {
 	struct platform_device *pdev;
 	struct clk *spdif_clk;
 	struct clk *apb_clk;
+	struct reset_control *rst;
 	struct snd_soc_dai_driver cpu_dai_drv;
 	struct regmap *regmap;
 	struct snd_dmaengine_dai_dma_data dma_params_tx;
@@ -411,6 +413,7 @@ static const struct snd_soc_dapm_route dit_routes[] = {
 
 static const struct of_device_id sun4i_spdif_of_match[] = {
 	{ .compatible = "allwinner,sun4i-a10-spdif", },
+	{ .compatible = "allwinner,sun6i-a31-spdif", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, sun4i_spdif_of_match);
@@ -482,11 +485,23 @@ static int sun4i_spdif_probe(struct platform_device *pdev)
 	}
 
 	host->dma_params_tx.addr = res->start + SUN4I_SPDIF_TXFIFO;
-	host->dma_params_tx.maxburst = 4;
+	host->dma_params_tx.maxburst = 8;
 	host->dma_params_tx.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 
 	platform_set_drvdata(pdev, host);
 
+	if (of_device_is_compatible(pdev->dev.of_node,
+				    "allwinner,sun6i-a31-spdif")) {
+		host->rst = devm_reset_control_get_optional(&pdev->dev, NULL);
+		if (IS_ERR(host->rst) && PTR_ERR(host->rst) == -EPROBE_DEFER) {
+			ret = -EPROBE_DEFER;
+			dev_err(&pdev->dev, "Failed to get reset: %d\n", ret);
+			goto err_disable_apb_clk;
+		}
+		if (!IS_ERR(host->rst))
+			reset_control_deassert(host->rst);
+	}
+
 	ret = devm_snd_soc_register_component(&pdev->dev,
 				&sun4i_spdif_component, &sun4i_spdif_dai, 1);
 	if (ret)
-- 
2.9.2

[PATCH v2 2/2] ASoC: sunxi: compatibility for sun6i to SPDIF

[codekipper]

From: Marcus Cooper <codekipper@gmail.com>

The A31 SoC uses the same SPDIF block as found in earlier SoCs, but its
reset is controlled via a separate reset controller.

The DMA also complains when the maxburst is set to 4 so it's been adjusted
to 8 which suites both the older and newer SoCs.

Signed-off-by: Marcus Cooper <codekipper@gmail.com>
---
 sound/soc/sunxi/sun4i-spdif.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sunxi/sun4i-spdif.c b/sound/soc/sunxi/sun4i-spdif.c
index 0b04fb0..88fbb3a 100644
--- a/sound/soc/sunxi/sun4i-spdif.c
+++ b/sound/soc/sunxi/sun4i-spdif.c
@@ -29,6 +29,7 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/reset.h>
 #include <sound/dmaengine_pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
@@ -162,6 +163,7 @@ struct sun4i_spdif_dev {
 	struct platform_device *pdev;
 	struct clk *spdif_clk;
 	struct clk *apb_clk;
+	struct reset_control *rst;
 	struct snd_soc_dai_driver cpu_dai_drv;
 	struct regmap *regmap;
 	struct snd_dmaengine_dai_dma_data dma_params_tx;
@@ -411,6 +413,7 @@ static const struct snd_soc_dapm_route dit_routes[] = {
 
 static const struct of_device_id sun4i_spdif_of_match[] = {
 	{ .compatible = "allwinner,sun4i-a10-spdif", },
+	{ .compatible = "allwinner,sun6i-a31-spdif", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, sun4i_spdif_of_match);
@@ -482,11 +485,23 @@ static int sun4i_spdif_probe(struct platform_device *pdev)
 	}
 
 	host->dma_params_tx.addr = res->start + SUN4I_SPDIF_TXFIFO;
-	host->dma_params_tx.maxburst = 4;
+	host->dma_params_tx.maxburst = 8;
 	host->dma_params_tx.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 
 	platform_set_drvdata(pdev, host);
 
+	if (of_device_is_compatible(pdev->dev.of_node,
+				    "allwinner,sun6i-a31-spdif")) {
+		host->rst = devm_reset_control_get_optional(&pdev->dev, NULL);
+		if (IS_ERR(host->rst) && PTR_ERR(host->rst) == -EPROBE_DEFER) {
+			ret = -EPROBE_DEFER;
+			dev_err(&pdev->dev, "Failed to get reset: %d\n", ret);
+			goto err_disable_apb_clk;
+		}
+		if (!IS_ERR(host->rst))
+			reset_control_deassert(host->rst);
+	}
+
 	ret = devm_snd_soc_register_component(&pdev->dev,
 				&sun4i_spdif_component, &sun4i_spdif_dai, 1);
 	if (ret)
-- 
2.9.2

[PATCH v2 2/2] ASoC: sunxi: compatibility for sun6i to SPDIF

[codekipper at gmail.com]

From: Marcus Cooper <codekipper@gmail.com>

The A31 SoC uses the same SPDIF block as found in earlier SoCs, but its
reset is controlled via a separate reset controller.

The DMA also complains when the maxburst is set to 4 so it's been adjusted
to 8 which suites both the older and newer SoCs.

Signed-off-by: Marcus Cooper <codekipper@gmail.com>
---
 sound/soc/sunxi/sun4i-spdif.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sunxi/sun4i-spdif.c b/sound/soc/sunxi/sun4i-spdif.c
index 0b04fb0..88fbb3a 100644
--- a/sound/soc/sunxi/sun4i-spdif.c
+++ b/sound/soc/sunxi/sun4i-spdif.c
@@ -29,6 +29,7 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/reset.h>
 #include <sound/dmaengine_pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
@@ -162,6 +163,7 @@ struct sun4i_spdif_dev {
 	struct platform_device *pdev;
 	struct clk *spdif_clk;
 	struct clk *apb_clk;
+	struct reset_control *rst;
 	struct snd_soc_dai_driver cpu_dai_drv;
 	struct regmap *regmap;
 	struct snd_dmaengine_dai_dma_data dma_params_tx;
@@ -411,6 +413,7 @@ static const struct snd_soc_dapm_route dit_routes[] = {
 
 static const struct of_device_id sun4i_spdif_of_match[] = {
 	{ .compatible = "allwinner,sun4i-a10-spdif", },
+	{ .compatible = "allwinner,sun6i-a31-spdif", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, sun4i_spdif_of_match);
@@ -482,11 +485,23 @@ static int sun4i_spdif_probe(struct platform_device *pdev)
 	}
 
 	host->dma_params_tx.addr = res->start + SUN4I_SPDIF_TXFIFO;
-	host->dma_params_tx.maxburst = 4;
+	host->dma_params_tx.maxburst = 8;
 	host->dma_params_tx.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 
 	platform_set_drvdata(pdev, host);
 
+	if (of_device_is_compatible(pdev->dev.of_node,
+				    "allwinner,sun6i-a31-spdif")) {
+		host->rst = devm_reset_control_get_optional(&pdev->dev, NULL);
+		if (IS_ERR(host->rst) && PTR_ERR(host->rst) == -EPROBE_DEFER) {
+			ret = -EPROBE_DEFER;
+			dev_err(&pdev->dev, "Failed to get reset: %d\n", ret);
+			goto err_disable_apb_clk;
+		}
+		if (!IS_ERR(host->rst))
+			reset_control_deassert(host->rst);
+	}
+
 	ret = devm_snd_soc_register_component(&pdev->dev,
 				&sun4i_spdif_component, &sun4i_spdif_dai, 1);
 	if (ret)
-- 
2.9.2