[PATCH v4 9/9] arm64: dts: renesas: salvator: add a connection from adv748x codec (HDMI input) to the R-Car SoC

[Alex Riesen]

As all known variants of the Salvator board have the HDMI decoder
chip (the ADV7482) connected to the SSI4 on R-Car SoC, the ADV7482
endpoint and the connection definitions are placed in the common board
file.

For the same reason, the CLK_C clock line and I2C configuration (similar
to the ak4613, on the same interface) are added into the common file.

Signed-off-by: Alexander Riesen <alexander.riesen@xxxxxxxxxxx>

--

v2: Also add ssi4_ctrl pin group in the sound pins. The pins are
    responsible for SCK4 (sample clock) WS4 and (word boundary input),
    and are required for SSI audio input over I2S.

    The adv748x shall provide its own implementation of the output clock
    (MCLK), connected to the audio_clk_c line of the R-Car SoC.

    If the frequency of the ADV748x MCLK were fixed, the clock
    implementation were not necessary, but it does not seem so: the MCLK
    depends on the value in a speed multiplier register and the input sample
    rate (48kHz).

    Remove audio clock C from the clocks of adv7482.

    The clocks property of the video-receiver node lists the input
    clocks of the device, which is quite the opposite from the
    original intention: the adv7482 on Salvator X boards is a
    provide of the MCLK clock for I2S audio output.

    Remove old definition of &sound_card.dais and reduce size of changes
    in the Salvator-X specific device tree source.

    Declare video-receiver a clock producer, as the adv748x driver
    implements the master clock used I2S audio output.

    Suggested-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>

v2: The driver provides only MCLK clock, not the SCLK and LRCLK,
    which are part of the I2S protocol.

    Suggested-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
 .../boot/dts/renesas/r8a77950-salvator-x.dts  |  3 +-
 .../boot/dts/renesas/salvator-common.dtsi     | 47 +++++++++++++++++--
 2 files changed, 44 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/boot/dts/renesas/r8a77950-salvator-x.dts b/arch/arm64/boot/dts/renesas/r8a77950-salvator-x.dts
index 2438825c9b22..e16c146808b6 100644
--- a/arch/arm64/boot/dts/renesas/r8a77950-salvator-x.dts
+++ b/arch/arm64/boot/dts/renesas/r8a77950-salvator-x.dts
@@ -146,7 +146,8 @@ &sata {
 &sound_card {
 	dais = <&rsnd_port0	/* ak4613 */
 		&rsnd_port1	/* HDMI0  */
-		&rsnd_port2>;	/* HDMI1  */
+		&rsnd_port2	/* HDMI1  */
+		&rsnd_port3>;	/* adv7482 hdmi-in  */
 };
 
 &usb2_phy2 {
diff --git a/arch/arm64/boot/dts/renesas/salvator-common.dtsi b/arch/arm64/boot/dts/renesas/salvator-common.dtsi
index 98bbcafc8c0d..ead7f8d7a929 100644
--- a/arch/arm64/boot/dts/renesas/salvator-common.dtsi
+++ b/arch/arm64/boot/dts/renesas/salvator-common.dtsi
@@ -460,7 +460,7 @@ pca9654: gpio@20 {
 		#gpio-cells = <2>;
 	};
 
-	video-receiver@70 {
+	adv7482_hdmi_in: video-receiver@70 {
 		compatible = "adi,adv7482";
 		reg = <0x70 0x71 0x72 0x73 0x74 0x75
 		       0x60 0x61 0x62 0x63 0x64 0x65>;
@@ -469,6 +469,7 @@ video-receiver@70 {
 
 		#address-cells = <1>;
 		#size-cells = <0>;
+		#clock-cells = <0>; /* the MCLK for I2S output */
 
 		interrupt-parent = <&gpio6>;
 		interrupt-names = "intrq1", "intrq2";
@@ -510,6 +511,15 @@ adv7482_txb: endpoint {
 				remote-endpoint = <&csi20_in>;
 			};
 		};
+
+		port@c {
+			reg = <12>;
+
+			adv7482_i2s: endpoint {
+				remote-endpoint = <&rsnd_endpoint3>;
+				system-clock-direction-out;
+			};
+		};
 	};
 
 	csa_vdd: adc@7c {
@@ -684,7 +694,8 @@ sdhi3_pins_uhs: sd3_uhs {
 	};
 
 	sound_pins: sound {
-		groups = "ssi01239_ctrl", "ssi0_data", "ssi1_data_a";
+		groups = "ssi01239_ctrl", "ssi0_data", "ssi1_data_a",
+			 "ssi4_data", "ssi4_ctrl";
 		function = "ssi";
 	};
 
@@ -733,8 +744,8 @@ &rcar_sound {
 	pinctrl-0 = <&sound_pins &sound_clk_pins>;
 	pinctrl-names = "default";
 
-	/* Single DAI */
-	#sound-dai-cells = <0>;
+	/* multi DAI */
+	#sound-dai-cells = <1>;
 
 	/* audio_clkout0/1/2/3 */
 	#clock-cells = <1>;
@@ -758,8 +769,19 @@ &rcar_sound {
 		 <&cpg CPG_MOD 1020>, <&cpg CPG_MOD 1021>,
 		 <&cpg CPG_MOD 1019>, <&cpg CPG_MOD 1018>,
 		 <&audio_clk_a>, <&cs2000>,
-		 <&audio_clk_c>,
+		 <&adv7482_hdmi_in>,
 		 <&cpg CPG_CORE CPG_AUDIO_CLK_I>;
+	clock-names = "ssi-all",
+		      "ssi.9", "ssi.8", "ssi.7", "ssi.6",
+		      "ssi.5", "ssi.4", "ssi.3", "ssi.2",
+		      "ssi.1", "ssi.0",
+		      "src.9", "src.8", "src.7", "src.6",
+		      "src.5", "src.4", "src.3", "src.2",
+		      "src.1", "src.0",
+		      "mix.1", "mix.0",
+		      "ctu.1", "ctu.0",
+		      "dvc.0", "dvc.1",
+		      "clk_a", "clk_b", "clk_c", "clk_i";
 
 	ports {
 		#address-cells = <1>;
@@ -777,6 +799,21 @@ rsnd_endpoint0: endpoint {
 				capture  = <&ssi1 &src1 &dvc1>;
 			};
 		};
+		rsnd_port3: port@3 {
+			reg = <3>;
+			rsnd_endpoint3: endpoint {
+				remote-endpoint = <&adv7482_i2s>;
+
+				dai-tdm-slot-num = <8>;
+				dai-tdm-slot-width = <32>;
+				dai-format = "left_j";
+				mclk-fs = <256>;
+				bitclock-master = <&adv7482_i2s>;
+				frame-master = <&adv7482_i2s>;
+
+				capture = <&ssi4>;
+			};
+		};
 	};
 };
 
-- 
2.25.1.25.g9ecbe7eb18