The SSC is currently not usable with the ASoC simple-audio-card, as every SSC audio user has to build a platform driver that may do as little as calling atmel_ssc_set_audio/atmel_ssc_put_audio (which allocates the SSC and registers a DAI with the ASoC subsystem).
So, have that happen automatically, if the #sound-dai-cells property is present in devicetree, which it has to be anyway for simple audio card to work.
Acked-by: Rob Herring robh@kernel.org Signed-off-by: Peter Rosin peda@axentia.se --- .../devicetree/bindings/misc/atmel-ssc.txt | 2 + drivers/misc/atmel-ssc.c | 50 ++++++++++++++++++++++ include/linux/atmel-ssc.h | 1 + 3 files changed, 53 insertions(+)
diff --git a/Documentation/devicetree/bindings/misc/atmel-ssc.txt b/Documentation/devicetree/bindings/misc/atmel-ssc.txt index efc98ea1f23d..f8629bb73945 100644 --- a/Documentation/devicetree/bindings/misc/atmel-ssc.txt +++ b/Documentation/devicetree/bindings/misc/atmel-ssc.txt @@ -24,6 +24,8 @@ Optional properties: this parameter to choose where the clock from. - By default the clock is from TK pin, if the clock from RK pin, this property is needed. + - #sound-dai-cells: Should contain <0>. + - This property makes the SSC into an automatically registered DAI.
Examples: - PDC transfer: diff --git a/drivers/misc/atmel-ssc.c b/drivers/misc/atmel-ssc.c index 0516ecda54d3..b2a0340f277e 100644 --- a/drivers/misc/atmel-ssc.c +++ b/drivers/misc/atmel-ssc.c @@ -20,6 +20,8 @@
#include <linux/of.h>
+#include "../../sound/soc/atmel/atmel_ssc_dai.h" + /* Serialize access to ssc_list and user count */ static DEFINE_SPINLOCK(user_lock); static LIST_HEAD(ssc_list); @@ -145,6 +147,49 @@ static inline const struct atmel_ssc_platform_data * __init platform_get_device_id(pdev)->driver_data; }
+#ifdef CONFIG_SND_ATMEL_SOC_SSC +static int ssc_sound_dai_probe(struct ssc_device *ssc) +{ + struct device_node *np = ssc->pdev->dev.of_node; + int ret; + int id; + + ssc->sound_dai = false; + + if (!of_property_read_bool(np, "#sound-dai-cells")) + return 0; + + id = of_alias_get_id(np, "ssc"); + if (id < 0) + return id; + + ret = atmel_ssc_set_audio(id); + ssc->sound_dai = !ret; + + return ret; +} + +static void ssc_sound_dai_remove(struct ssc_device *ssc) +{ + if (!ssc->sound_dai) + return; + + atmel_ssc_put_audio(of_alias_get_id(ssc->pdev->dev.of_node, "ssc")); +} +#else +static inline int ssc_sound_dai_probe(struct ssc_device *ssc) +{ + if (of_property_read_bool(ssc->pdev->dev.of_node, "#sound-dai-cells")) + return -ENOTSUPP; + + return 0; +} + +static inline void ssc_sound_dai_remove(struct ssc_device *ssc) +{ +} +#endif + static int ssc_probe(struct platform_device *pdev) { struct resource *regs; @@ -204,6 +249,9 @@ static int ssc_probe(struct platform_device *pdev) dev_info(&pdev->dev, "Atmel SSC device at 0x%p (irq %d)\n", ssc->regs, ssc->irq);
+ if (ssc_sound_dai_probe(ssc)) + dev_err(&pdev->dev, "failed to auto-setup ssc for audio\n"); + return 0; }
@@ -211,6 +259,8 @@ static int ssc_remove(struct platform_device *pdev) { struct ssc_device *ssc = platform_get_drvdata(pdev);
+ ssc_sound_dai_remove(ssc); + spin_lock(&user_lock); list_del(&ssc->list); spin_unlock(&user_lock); diff --git a/include/linux/atmel-ssc.h b/include/linux/atmel-ssc.h index 7c0f6549898b..fdb545101ede 100644 --- a/include/linux/atmel-ssc.h +++ b/include/linux/atmel-ssc.h @@ -20,6 +20,7 @@ struct ssc_device { int user; int irq; bool clk_from_rk_pin; + bool sound_dai; };
struct ssc_device * __must_check ssc_request(unsigned int ssc_num);