ASoC: sunxi: compatibility 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.

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>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 16 insertions, 1 deletions

diff --git a/sound/soc/sunxi/sun4i-spdif.c b/sound/soc/sunxi/sun4i-spdif.c
index 0b04fb02125c..88fbb3a1e660 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)