From: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
ALSA SoC needs to know connected DAI ID for probing.
It is not a big problem if device/driver was only for sound,
but getting DAI ID will be difficult if device includes both
Video/Sound, like HDMI.
To solve this issue, this patch adds new .get_dai_id callback
on hdmi_codec_ops.
dw-hdmi-i2s will assume that HDMI sound will be connected
to reg = <2>. Then, ALSA SoC side will recognized it as DAI 0
ports {
#address-cells = <1>;
#size-cells = <0>;
port@0 {
reg = <0>;
/* HDMI Video IN */
};
port@1 {
reg = <1>;
/* HDMI OUT */
};
port@2 {
reg = <2>;
/* HDMI Sound IN */
};
};
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
Acked-by: Archit Taneja <architt@xxxxxxxxxxxxxx>
---
v1 -> v1 resend
- add Archit's Acked-by (= DRM maintainer)
.../bindings/display/bridge/renesas,dw-hdmi.txt | 9 ++++++++-
drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c | 21 +++++++++++++++++++++
2 files changed, 29 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/display/bridge/renesas,dw-hdmi.txt b/Documentation/devicetree/bindings/display/bridge/renesas,dw-hdmi.txt
index f6b3f36..81b6858 100644
--- a/Documentation/devicetree/bindings/display/bridge/renesas,dw-hdmi.txt
+++ b/Documentation/devicetree/bindings/display/bridge/renesas,dw-hdmi.txt
@@ -25,7 +25,8 @@ Required properties:
- clock-names: Shall contain "iahb" and "isfr" as defined in dw_hdmi.txt.
- ports: See dw_hdmi.txt. The DWC HDMI shall have one port numbered 0
corresponding to the video input of the controller and one port numbered 1
- corresponding to its HDMI output. Each port shall have a single endpoint.
+ corresponding to its HDMI output, and one port numbered 2 corresponding to
+ sound input of the controller. Each port shall have a single endpoint.
Optional properties:
@@ -59,6 +60,12 @@ Example:
remote-endpoint = <&hdmi0_con>;
};
};
+ port@2 {
+ reg = <2>;
+ rcar_dw_hdmi0_sound_in: endpoint {
+ remote-endpoint = <&hdmi_sound_out>;
+ };
+ };
};
};
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
index aaf287d..b2cf59f 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
@@ -82,9 +82,30 @@ static void dw_hdmi_i2s_audio_shutdown(struct device *dev, void *data)
hdmi_write(audio, HDMI_AUD_CONF0_SW_RESET, HDMI_AUD_CONF0);
}
+static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
+ struct device_node *endpoint)
+{
+ struct of_endpoint of_ep;
+ int ret;
+
+ ret = of_graph_parse_endpoint(endpoint, &of_ep);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * HDMI sound should be located as reg = <2>
+ * Then, it is sound port 0
+ */
+ if (of_ep.port == 2)
+ return 0;
+
+ return -EINVAL;
+}
+
static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
.hw_params = dw_hdmi_i2s_hw_params,
.audio_shutdown = dw_hdmi_i2s_audio_shutdown,
+ .get_dai_id = dw_hdmi_i2s_get_dai_id,
};
static int snd_dw_hdmi_probe(struct platform_device *pdev)
--
1.9.1
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