[PATCH v6 2/4] arm64: dts: renesas: rzg3e-smarc-som: Add Versa3 clock generator

[John Madieu <john.madieu.xa@bp.renesas.com>]

Add the Renesas 5P35023 (Versa3) programmable clock generator on the
I2C2 bus along with its 24MHz input clock (x2 oscillator) to feed the
audio subsystem.

The Versa3 provides the following clock outputs:
- Output 0: 24MHz (reference)
- Output 1: 12.288MHz (audio, 48kHz family)
- Output 2: 11.2896MHz (audio, 44.1kHz family)
- Output 3: 12.288MHz (audio)
- Output 4: 25MHz (DIFF1, Ethernet)

These clocks are required for the audio codec and the Ethernet
controller found on the RZ/G3E SMARC EVK.

Output 5 (DIFF2) is left out, as it is not connected on this board.

Signed-off-by: John Madieu <john.madieu.xa@bp.renesas.com>
---

Changes:

v6:
 - Actually drop Versa3 output 5 (DIFF2) from assigned-clocks and
   assigned-clock-rates; v5 documented the removal in the commit
   message but left the entry in the DTS.
v5:
 - Document output 4 (DIFF1) in the commit message; it is needed for
   Ethernet.

 .../boot/dts/renesas/rzg3e-smarc-som.dtsi     | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi b/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
index 15c22dbf0ad3..455ed35ae5d3 100644
--- a/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
+++ b/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
@@ -78,6 +78,12 @@ reg_vdd0p8v_others: regulator-vdd0p8v-others {
 		regulator-always-on;
 	};
 
+	x2: x2-clock {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <24000000>;
+	};
+
 	/* 32.768kHz crystal */
 	x3: x3-clock {
 		compatible = "fixed-clock";
@@ -137,6 +143,20 @@ raa215300: pmic@12 {
 
 		interrupts-extended = <&pinctrl RZG3E_GPIO(S, 1) IRQ_TYPE_EDGE_FALLING>;
 	};
+
+	versa3: clock-generator@68 {
+		compatible = "renesas,5p35023";
+		reg = <0x68>;
+		#clock-cells = <1>;
+		clocks = <&x2>;
+
+		assigned-clocks = <&versa3 0>, <&versa3 1>,
+				  <&versa3 2>, <&versa3 3>,
+				  <&versa3 4>;
+		assigned-clock-rates = <24000000>, <12288000>,
+				       <11289600>, <12288000>,
+				       <25000000>;
+	};
 };
 
 &i3c {
-- 
2.25.1