Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Samuel Holland <samuel@sholland.org>
To:     Maxime Ripard <mripard@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
        Jernej Skrabec <jernej.skrabec@siol.net>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Rob Herring <robh+dt@kernel.org>
Cc:     alsa-devel@alsa-project.org, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev,
        linux-kernel@vger.kernel.org, Samuel Holland <samuel@sholland.org>
Subject: [PATCH v3 6/7] arm64: dts: allwinner: pinephone: Add support for Bluetooth audio
Date:   Thu, 29 Apr 2021 22:58:58 -0500
Message-Id: <20210430035859.3487-7-samuel@sholland.org>
In-Reply-To: <20210430035859.3487-1-samuel@sholland.org>
References: <20210430035859.3487-1-samuel@sholland.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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 16 bit PCM, configuring the link a 32-bit slot
is required for compatibility with AIF2, which also uses a 32-bit slot,
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@sholland.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 9f69d489a81d..51cbfdc12936 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
@@ -25,6 +25,11 @@ 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";
 	};
@@ -91,6 +96,8 @@ vibrator {
 };
 
 &codec {
+	pinctrl-names = "default";
+	pinctrl-0 = <&aif3_pins>;
 	status = "okay";
 };
 
@@ -447,6 +454,23 @@ &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 = <1>;
+			dai-tdm-slot-width = <32>;
+		};
+	};
 };
 
 &uart0 {
-- 
2.26.3