[alsa-devel] [PATCH v9 1/4] drm/i2c: tda998x: Add DT support for audio

[Jyri Sarha]

On 01/07/2015 11:10 AM, Jean-Francois Moine wrote:
> This patch permits the definition of the audio ports from the device tree.
>
> Signed-off-by: Jean-Francois Moine <moinejf at free.fr>
> ---
>   .../devicetree/bindings/drm/i2c/tda998x.txt        | 18 +++++++
>   drivers/gpu/drm/i2c/tda998x_drv.c                  | 60 ++++++++++++++++++----
>   2 files changed, 69 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/drm/i2c/tda998x.txt b/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
> index e9e4bce..e50e7cd 100644
> --- a/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
> +++ b/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
> @@ -17,6 +17,20 @@ Optional properties:
>     - video-ports: 24 bits value which defines how the video controller
>   	output is wired to the TDA998x input - default: <0x230145>
>
> +  - audio-ports: must contain one or two values selecting the source
> +	in the audio port.
> +	The source type is given by the corresponding entry in
> +	the audio-port-names property.
> +

This binding does not allow multi channel i2s setups with multiple i2s 
pins. It would be nice to support that in the DT binding, even if the 
code is not yet ready for it.

How about having these two optional properties instead of audio-ports 
and audio-port-names:

audio-port-i2s: Upto 4 values for selecting pins for i2s port
audio-port-spdif: Value for selecting input pin for spdif port

Presence of one of the properties would be mandatory and both are allowed.

Sorry to notice this only now, but I have not yet looked the drm side 
changes too closely.

> +  - audio-port-names: must contain entries matching the entries in
> +	the audio-ports property.
> +	Each value may be "i2s" or "spdif", giving the type of
> +	the audio source.
> +
> +  - #sound-dai-cells: must be set to <1> for use with the simple-card.
> +	The TDA998x audio CODEC always defines two DAIs.
> +	The DAI 0 is the S/PDIF input and the DAI 1 is the I2S input.
> +
>   Example:
>
>   	tda998x: hdmi-encoder {
> @@ -26,4 +40,8 @@ Example:
>   		interrupts = <27 2>;		/* falling edge */
>   		pinctrl-0 = <&pmx_camera>;
>   		pinctrl-names = "default";
> +
> +		audio-ports = <0x04>, <0x03>;
> +		audio-port-names = "spdif", "i2s";
> +		#sound-dai-cells = <1>;
>   	};
> diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
> index 70658af..9d9b072 100644
> --- a/drivers/gpu/drm/i2c/tda998x_drv.c
> +++ b/drivers/gpu/drm/i2c/tda998x_drv.c
> @@ -20,6 +20,7 @@
>   #include <linux/module.h>
>   #include <linux/irq.h>
>   #include <sound/asoundef.h>
> +#include <linux/platform_device.h>
>
>   #include <drm/drmP.h>
>   #include <drm/drm_crtc_helper.h>
> @@ -44,6 +45,8 @@ struct tda998x_priv {
>   	wait_queue_head_t wq_edid;
>   	volatile int wq_edid_wait;
>   	struct drm_encoder *encoder;
> +
> +	u8 audio_ports[2];
>   };
>
>   #define to_tda998x_priv(x)  ((struct tda998x_priv *)to_encoder_slave(x)->slave_priv)
> @@ -1254,12 +1257,16 @@ static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv)
>   {
>   	struct device_node *np = client->dev.of_node;
>   	u32 video;
> -	int rev_lo, rev_hi, ret;
> +	int i, rev_lo, rev_hi, ret;
> +	const char *p;
>
>   	priv->vip_cntrl_0 = VIP_CNTRL_0_SWAP_A(2) | VIP_CNTRL_0_SWAP_B(3);
>   	priv->vip_cntrl_1 = VIP_CNTRL_1_SWAP_C(0) | VIP_CNTRL_1_SWAP_D(1);
>   	priv->vip_cntrl_2 = VIP_CNTRL_2_SWAP_E(4) | VIP_CNTRL_2_SWAP_F(5);
>
> +	priv->params.audio_frame[1] = 1;		/* channels - 1 */
> +	priv->params.audio_sample_rate = 48000;		/* 48kHz */
> +
>   	priv->current_page = 0xff;
>   	priv->hdmi = client;
>   	priv->cec = i2c_new_dummy(client->adapter, 0x34);
> @@ -1351,15 +1358,50 @@ static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv)
>   	/* enable EDID read irq: */
>   	reg_set(priv, REG_INT_FLAGS_2, INT_FLAGS_2_EDID_BLK_RD);
>
> -	if (!np)
> -		return 0;		/* non-DT */
> +	/* get the device tree parameters */
> +	if (np) {
> +
> +		/* optional video properties */
> +		ret = of_property_read_u32(np, "video-ports", &video);
> +		if (ret == 0) {
> +			priv->vip_cntrl_0 = video >> 16;
> +			priv->vip_cntrl_1 = video >> 8;
> +			priv->vip_cntrl_2 = video;
> +		}
> +
> +		/* optional audio properties */
> +		for (i = 0; i < 2; i++) {
> +			u32 port;
>
> -	/* get the optional video properties */
> -	ret = of_property_read_u32(np, "video-ports", &video);
> -	if (ret == 0) {
> -		priv->vip_cntrl_0 = video >> 16;
> -		priv->vip_cntrl_1 = video >> 8;
> -		priv->vip_cntrl_2 = video;
> +			ret = of_property_read_u32_index(np, "audio-ports", i, &port);
> +			if (ret)
> +				break;
> +			ret = of_property_read_string_index(np, "audio-port-names",
> +							i, &p);
> +			if (ret) {
> +				dev_err(&client->dev,
> +					"missing audio-port-names[%d]\n", i);
> +				break;
> +			}
> +			if (strcmp(p, "spdif") == 0) {
> +				priv->audio_ports[0] = port;
> +			} else if (strcmp(p, "i2s") == 0) {
> +				priv->audio_ports[1] = port;
> +			} else {
> +				dev_err(&client->dev,
> +					"bad audio-port-names '%s'\n", p);
> +				break;
> +			}
> +		}
> +		if (priv->audio_ports[0]) {
> +			priv->params.audio_cfg = priv->audio_ports[0];
> +			priv->params.audio_format = AFMT_SPDIF;
> +			priv->params.audio_clk_cfg = 0;
> +		} else {
> +			priv->params.audio_cfg = priv->audio_ports[1];
> +			priv->params.audio_format = AFMT_I2S;
> +			priv->params.audio_clk_cfg = 1;
> +		}
>   	}
>
>   	return 0;
>