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);

This breaks devicetree compatibility, but in this case that is ok. All affected units are either on my desk, or running an even older version of the driver that is not compatible with the upstreamed version anyway (and when these other units are eventually updated, they will get a fresh dtb as well, so that is not a significant problem either).

All of that is of course assuming that noone else has managed to build something that can use this driver, but that seems extremely improbable.

Signed-off-by: Peter Rosin peda@axentia.se --- .../bindings/sound/axentia,tse850-pcm5142.txt | 11 ++++++++--- sound/soc/atmel/tse850-pcm5142.c | 23 +++------------------- 2 files changed, 11 insertions(+), 23 deletions(-)

diff --git a/Documentation/devicetree/bindings/sound/axentia,tse850-pcm5142.txt b/Documentation/devicetree/bindings/sound/axentia,tse850-pcm5142.txt index 5b9b38f578bb..fdb25b492514 100644 --- a/Documentation/devicetree/bindings/sound/axentia,tse850-pcm5142.txt +++ b/Documentation/devicetree/bindings/sound/axentia,tse850-pcm5142.txt @@ -2,8 +2,7 @@ Devicetree bindings for the Axentia TSE-850 audio complex

Required properties: - compatible: "axentia,tse850-pcm5142" - - axentia,ssc-controller: The phandle of the atmel SSC controller used as - cpu dai. + - axentia,cpu-dai: The phandle of the cpu dai. - axentia,audio-codec: The phandle of the PCM5142 codec. - axentia,add-gpios: gpio specifier that controls the mixer. - axentia,loop1-gpios: gpio specifier that controls loop relays on channel 1. @@ -43,6 +42,12 @@ the PCM5142 codec.

Example:

+ &ssc0 { + #sound-dai-cells = <0>; + + status = "okay"; + }; + &i2c { codec: pcm5142@4c { compatible = "ti,pcm5142"; @@ -77,7 +82,7 @@ Example: sound { compatible = "axentia,tse850-pcm5142";

- axentia,ssc-controller = <&ssc0>; + axentia,cpu-dai = <&ssc0>; axentia,audio-codec = <&codec>;

axentia,add-gpios = <&pioA 8 GPIO_ACTIVE_LOW>; diff --git a/sound/soc/atmel/tse850-pcm5142.c b/sound/soc/atmel/tse850-pcm5142.c index ac6a814c8ecf..a72c7d642026 100644 --- a/sound/soc/atmel/tse850-pcm5142.c +++ b/sound/soc/atmel/tse850-pcm5142.c @@ -51,11 +51,7 @@ #include <sound/soc.h> #include <sound/pcm_params.h>

-#include "atmel_ssc_dai.h" - struct tse850_priv { - int ssc_id; - struct gpio_desc *add; struct gpio_desc *loop1; struct gpio_desc *loop2; @@ -329,23 +325,20 @@ static int tse850_dt_init(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct device_node *codec_np, *cpu_np; - struct snd_soc_card *card = &tse850_card; struct snd_soc_dai_link *dailink = &tse850_dailink; - struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);

if (!np) { dev_err(&pdev->dev, "only device tree supported\n"); return -EINVAL; }

- cpu_np = of_parse_phandle(np, "axentia,ssc-controller", 0); + cpu_np = of_parse_phandle(np, "axentia,cpu-dai", 0); if (!cpu_np) { - dev_err(&pdev->dev, "failed to get dai and pcm info\n"); + dev_err(&pdev->dev, "failed to get cpu dai\n"); return -EINVAL; } dailink->cpu_of_node = cpu_np; dailink->platform_of_node = cpu_np; - tse850->ssc_id = of_alias_get_id(cpu_np, "ssc"); of_node_put(cpu_np);

codec_np = of_parse_phandle(np, "axentia,audio-codec", 0); @@ -415,23 +408,14 @@ static int tse850_probe(struct platform_device *pdev) return ret; }

- ret = atmel_ssc_set_audio(tse850->ssc_id); - if (ret != 0) { - dev_err(dev, - "failed to set SSC %d for audio\n", tse850->ssc_id); - goto err_disable_ana; - } - ret = snd_soc_register_card(card); if (ret) { dev_err(dev, "snd_soc_register_card failed\n"); - goto err_put_audio; + goto err_disable_ana; }

return 0;

-err_put_audio: - atmel_ssc_put_audio(tse850->ssc_id); err_disable_ana: regulator_disable(tse850->ana); return ret; @@ -443,7 +427,6 @@ static int tse850_remove(struct platform_device *pdev) struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);

snd_soc_unregister_card(card); - atmel_ssc_put_audio(tse850->ssc_id); regulator_disable(tse850->ana);

return 0;