arm64: dts: qcom: msm8939-samsung-a7: Add sound and modem

Enable sound and modem for the Samsung A7. The setup is similar to most
MSM8916 devices, i.e.:

 - QDSP6 audio
 - Earpiece/headphones/microphones via digital/analog codec in
   MSM8916/PM8916
 - WWAN Internet via BAM-DMUX

except for the same differences as the MSM8916-based Samsung A2015
devices:

 - NXP TFA9895 codec for speaker on Quaternary MI2S
 - Samsung-specific audio jack detection (not supported yet)
Signed-off-by: "Lin, Meng-Bo" <linmengbo0689@protonmail.com>
[Stephan: Add consistent commit message, minor refactoring]
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20231003-msm8916-modem-v2-14-61b684be55c0@gerhold.netSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/msm8939-samsung-a7.dts

@@ -3,10 +3,12 @@
 /dts-v1/;
 
 #include "msm8939-pm8916.dtsi"
+#include "msm8916-modem-qdsp6.dtsi"
 
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/input/input.h>
 #include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/sound/apq8016-lpass.h>
 
 / {
 	model = "Samsung Galaxy A7 (2015)";
@@ -287,6 +289,18 @@ muic: extcon@25 {
 	};
 };
 
+&blsp_i2c2 {
+	status = "okay";
+
+	speaker_codec: audio-codec@34 {
+		compatible = "nxp,tfa9895";
+		reg = <0x34>;
+		vddd-supply = <&pm8916_l5>;
+		sound-name-prefix = "Speaker";
+		#sound-dai-cells = <0>;
+	};
+};
+
 &blsp_i2c5 {
 	status = "okay";
 
@@ -309,6 +323,29 @@ &blsp_uart2 {
 	status = "okay";
 };
 
+/*
+ * For some reason the speaker amplifier is connected to the second SD line
+ * (MI2S_2_D1) instead of the first (MI2S_2_D0). This must be configured in the
+ * device tree, otherwise audio will seemingly play fine on the wrong SD line
+ * but the speaker stays silent.
+ *
+ * When routing audio via QDSP6 (the default) the &lpass node is reserved and
+ * the definitions from &q6afedai are used. When the modem is disabled audio can
+ * be alternatively routed directly to the LPASS hardware with reduced latency.
+ * The definitions for &lpass are here for completeness to simplify changing the
+ * setup with minor changes to the DT (either manually or with DT overlays).
+ */
+&lpass {
+	dai-link@3 {
+		reg = <MI2S_QUATERNARY>;
+		qcom,playback-sd-lines = <1>;
+	};
+};
+
+&mpss_mem {
+	reg = <0x0 0x86800000 0x0 0x5800000>;
+};
+
 &pm8916_resin {
 	linux,code = <KEY_VOLUMEDOWN>;
 	status = "okay";
@@ -321,6 +358,13 @@ pm8916_l17: l17 {
 	};
 };
 
+&q6afedai {
+	dai@22 {
+		reg = <QUATERNARY_MI2S_RX>;
+		qcom,sd-lines = <1>;
+	};
+};
+
 &sdhc_1 {
 	status = "okay";
 };
@@ -335,6 +379,32 @@ &sdhc_2 {
 	status = "okay";
 };
 
+&sound {
+	model = "samsung-a2015";
+	audio-routing =
+		"AMIC1", "MIC BIAS External1",
+		"AMIC2", "MIC BIAS Internal2",
+		"AMIC3", "MIC BIAS External1";
+
+	pinctrl-0 = <&cdc_pdm_default &sec_mi2s_default>;
+	pinctrl-1 = <&cdc_pdm_sleep &sec_mi2s_sleep>;
+	pinctrl-names = "default", "sleep";
+
+	sound_link_backend2: backend2-dai-link {
+		link-name = "Quaternary MI2S";
+
+		cpu {
+			sound-dai = <&q6afedai QUATERNARY_MI2S_RX>;
+		};
+		platform {
+			sound-dai = <&q6routing>;
+		};
+		codec {
+			sound-dai = <&speaker_codec>;
+		};
+	};
+};
+
 &usb {
 	extcon = <&muic>, <&muic>;
 	status = "okay";