linux-kernel - [PATCH 6/7] arm64: dts: allwinner: pinephone: Add support for Bluetooth audio

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Date:   Thu,  5 Nov 2020 22:15:12 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        phone-devel@...r.kernel.org, Samuel Holland <samuel@...lland.org>
Subject: [PATCH 6/7] arm64: dts: allwinner: pinephone: Add support for Bluetooth audio

The PinePhone has a Bluetooth chip with its PCM interface connected to
AIF3. Add the DAI link so headeset audio can be routed in hardware.

Even though the link is mono, configuring the link for 2 slots is
required for compatibility with AIF2, which also uses 2 slots, and
which shares clock dividers with AIF3. Using equal clock frequencies
allows the modem and headset to be used at the same time.

Signed-off-by: Samuel Holland <samuel@...lland.org>
---
 .../dts/allwinner/sun50i-a64-pinephone.dtsi   | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
index 5780713b0dba..6125910d29db 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
@@ -23,6 +23,11 @@ backlight: backlight {
 		/* Backlight configuration differs per PinePhone revision. */
 	};
 
+	bt_sco_codec: bt-sco-codec {
+		#sound-dai-cells = <1>;
+		compatible = "linux,bt-sco";
+	};
+
 	chosen {
 		stdout-path = "serial0:115200n8";
 	};
@@ -63,6 +68,8 @@ vibrator {
 };
 
 &codec {
+	pinctrl-names = "default";
+	pinctrl-0 = <&aif3_pins>;
 	status = "okay";
 };
 
@@ -400,6 +407,23 @@ &sound {
 			"MIC1", "Internal Microphone",
 			"Headset Microphone", "HBIAS",
 			"MIC2", "Headset Microphone";
+
+	simple-audio-card,dai-link@2 {
+		format = "dsp_a";
+		frame-master = <&link2_codec>;
+		bitclock-master = <&link2_codec>;
+		bitclock-inversion;
+
+		link2_cpu: cpu {
+			sound-dai = <&bt_sco_codec 0>;
+		};
+
+		link2_codec: codec {
+			sound-dai = <&codec 2>;
+			dai-tdm-slot-num = <2>;
+			dai-tdm-slot-width = <16>;
+		};
+	};
 };
 
 &uart0 {
-- 
2.26.2