ARM: dts: r8a7793: add audio clock to device tree

Instantiate audio clock in r8a7793 device tree.
audio_clk_a/b/c are required for R-Car sound.

Based on similar work for the r8a7791 by Kuninori Morimoto.

Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/arch/arm/boot/dts/r8a7793.dtsi b/arch/arm/boot/dts/r8a7793.dtsi
index c4459f147330b49dccb366fbf6af7f5844a2d067..530fa9488a4ae0ab22f7f1202d225d745facf1c5 100644 (file)
--- a/arch/arm/boot/dts/r8a7793.dtsi
+++ b/arch/arm/boot/dts/r8a7793.dtsi
@@ -706,6 +706,29 @@
                        clock-output-names = "extal";
                };
 
+               /*
+                * The external audio clocks are configured as 0 Hz fixed frequency clocks by
+                * default. Boards that provide audio clocks should override them.
+                */
+               audio_clk_a: audio_clk_a {
+                       compatible = "fixed-clock";
+                       #clock-cells = <0>;
+                       clock-frequency = <0>;
+                       clock-output-names = "audio_clk_a";
+               };
+               audio_clk_b: audio_clk_b {
+                       compatible = "fixed-clock";
+                       #clock-cells = <0>;
+                       clock-frequency = <0>;
+                       clock-output-names = "audio_clk_b";
+               };
+               audio_clk_c: audio_clk_c {
+                       compatible = "fixed-clock";
+                       #clock-cells = <0>;
+                       clock-frequency = <0>;
+                       clock-output-names = "audio_clk_c";
+               };
+
                /* Special CPG clocks */
                cpg_clocks: cpg_clocks@e6150000 {
                        compatible = "renesas,r8a7793-cpg-clocks",