[PATCH v11 1/3] drm/i2c: tda998x: Add support of a DT graph of ports

From: Jean-Francois Moine
Date: Wed Apr 29 2015 - 11:28:29 EST

Two kinds of ports may be declared in a DT graph of ports: video and audio.
This patch accepts the port value from a video port as an alternative
to the video-ports property.
It also accepts audio ports in the case the transmitter is not used as
a slave encoder.
The new file include/sound/tda998x.h prepares to the definition of
a tda998x CODEC.

Signed-off-by: Jean-Francois Moine <moinejf@xxxxxxx>
---
.../devicetree/bindings/drm/i2c/tda998x.txt | 51 +++++++++++++
drivers/gpu/drm/i2c/tda998x_drv.c | 88 +++++++++++++++++++---
include/sound/tda998x.h | 8 ++
3 files changed, 138 insertions(+), 9 deletions(-)
create mode 100644 include/sound/tda998x.h

diff --git a/Documentation/devicetree/bindings/drm/i2c/tda998x.txt b/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
index e9e4bce..35f6a80 100644
--- a/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
+++ b/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
@@ -16,6 +16,35 @@ Optional properties:

- video-ports: 24 bits value which defines how the video controller
output is wired to the TDA998x input - default: <0x230145>
+ This property is not used when ports are defined.
+
+Optional nodes:
+
+ - port: up to three ports.
+ The ports are defined according to [1].
+
+ Video port.
+ There may be only one video port.
+ This one must contain the following property:
+
+ - port-type: must be "rgb"
+
+ and may contain the optional property:
+
+ - reg: 24 bits value which defines how the video controller
+ output is wired to the TDA998x input (video pins)
+ When absent, the default value is <0x230145>.
+
+ Audio ports.
+ There may be one or two audio ports.
+ These ones must contain the following properties:
+
+ - port-type: must be "i2s" or "spdif"
+
+ - reg: 8 bits value which defines how the audio controller
+ output is wired to the TDA998x input (audio pins)
+
+[1] Documentation/devicetree/bindings/graph.txt

Example:

@@ -26,4 +55,26 @@ Example:
interrupts = <27 2>; /* falling edge */
pinctrl-0 = <&pmx_camera>;
pinctrl-names = "default";
+
+ port@230145 {
+ port-type = "rgb";
+ reg = <0x230145>;
+ hdmi_0: endpoint {
+ remote-endpoint = <&lcd0_0>;
+ };
+ };
+ port@3 { /* AP1 = I2S */
+ port-type = "i2s";
+ reg = <0x03>;
+ tda998x_i2s: endpoint {
+ remote-endpoint = <&audio1_i2s>;
+ };
+ };
+ port@4 { /* AP2 = S/PDIF */
+ port-type = "spdif";
+ reg = <0x04>;
+ tda998x_spdif: endpoint {
+ remote-endpoint = <&audio1_spdif1>;
+ };
+ };
};
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 5febffd..a2ed391 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -27,6 +27,7 @@
#include <drm/drm_edid.h>
#include <drm/drm_of.h>
#include <drm/i2c/tda998x.h>
+#include <sound/tda998x.h>

#define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)

@@ -47,6 +48,8 @@ struct tda998x_priv {
wait_queue_head_t wq_edid;
volatile int wq_edid_wait;
struct drm_encoder *encoder;
+
+ struct tda998x_audio_s audio;
};

#define to_tda998x_priv(x) ((struct tda998x_priv *)to_encoder_slave(x)->slave_priv)
@@ -1227,9 +1230,57 @@ static struct drm_encoder_slave_funcs tda998x_encoder_slave_funcs = {

/* I2C driver functions */

+static int tda998x_parse_ports(struct tda998x_priv *priv,
+ struct device_node *np)
+{
+ struct device_node *of_port;
+ const char *port_type;
+ int ret, audio_index, reg, afmt;
+
+ audio_index = 0;
+ for_each_child_of_node(np, of_port) {
+ if (!of_port->name
+ || of_node_cmp(of_port->name, "port") != 0)
+ continue;
+ ret = of_property_read_string(of_port, "port-type",
+ &port_type);
+ if (ret < 0)
+ continue;
+ ret = of_property_read_u32(of_port, "reg", &reg);
+ if (strcmp(port_type, "rgb") == 0) {
+ if (!ret) { /* video reg is optional */
+ priv->vip_cntrl_0 = reg >> 16;
+ priv->vip_cntrl_1 = reg >> 8;
+ priv->vip_cntrl_2 = reg;
+ }
+ continue;
+ }
+ if (strcmp(port_type, "i2s") == 0)
+ afmt = AFMT_I2S;
+ else if (strcmp(port_type, "spdif") == 0)
+ afmt = AFMT_SPDIF;
+ else
+ continue;
+ if (ret < 0) {
+ dev_err(&priv->hdmi->dev, "missing reg for %s\n",
+ port_type);
+ return ret;
+ }
+ if (audio_index >= ARRAY_SIZE(priv->audio.ports)) {
+ dev_err(&priv->hdmi->dev, "too many audio ports\n");
+ break;
+ }
+ priv->audio.ports[audio_index] = reg;
+ priv->audio.port_types[audio_index] = afmt;
+ audio_index++;
+ }
+ return 0;
+}
+
static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv)
{
struct device_node *np = client->dev.of_node;
+ struct device_node *of_port;
u32 video;
int rev_lo, rev_hi, ret;
unsigned short cec_addr;
@@ -1334,15 +1385,34 @@ 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 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;
+ /* get the device tree parameters */
+ if (np) {
+ of_port = of_get_child_by_name(np, "port");
+ if (of_port) { /* graph of ports */
+ of_node_put(of_port);
+ ret = tda998x_parse_ports(priv, np);
+ if (ret < 0)
+ goto fail;
+
+ /* initialize the default audio configuration */
+ if (priv->audio.ports[0]) {
+ priv->params.audio_cfg = priv->audio.ports[0];
+ priv->params.audio_format =
+ priv->audio.port_types[0];
+ priv->params.audio_clk_cfg =
+ priv->params.audio_format ==
+ AFMT_SPDIF ? 0 : 1;
+ }
+ } else {
+
+ /* 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;
+ }
+ }
}

return 0;
diff --git a/include/sound/tda998x.h b/include/sound/tda998x.h
new file mode 100644
index 0000000..487a809
--- /dev/null
+++ b/include/sound/tda998x.h
@@ -0,0 +1,8 @@
+#ifndef SND_TDA998X_H
+#define SND_TDA998X_H
+
+struct tda998x_audio_s {
+ u8 ports[2]; /* AP value */
+ u8 port_types[2]; /* AFMT_xxx */
+};
+#endif
--
2.1.4

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