[PATCH v2 5/6] arm64: dts: renesas: r8a78000: Add CPG node
From: Geert Uytterhoeven
Date: Wed Jul 08 2026 - 06:23:14 EST
Add a device node for the Clock Pulse Generator (CPG) on the R-Car X5H
(R8A78000) SoC.
Convert all (H)SCIF serial ports from dummy to CPG clocks, removing the
need for any dummy clocks.
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
v2:
- Split in separate CPG and MDLC patches.
---
arch/arm64/boot/dts/renesas/r8a78000.dtsi | 59 +++++++++++++----------
1 file changed, 34 insertions(+), 25 deletions(-)
diff --git a/arch/arm64/boot/dts/renesas/r8a78000.dtsi b/arch/arm64/boot/dts/renesas/r8a78000.dtsi
index fb71974ef390509d..1fe078c7822c01a5 100644
--- a/arch/arm64/boot/dts/renesas/r8a78000.dtsi
+++ b/arch/arm64/boot/dts/renesas/r8a78000.dtsi
@@ -5,6 +5,7 @@
* Copyright (C) 2025 Renesas Electronics Corp.
*/
+#include <dt-bindings/clock/renesas,r8a78000-cpg.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
/ {
@@ -668,23 +669,6 @@ L3_CA720_7: cache-controller-37 {
};
};
- /*
- * In the early phase, there is no clock control support,
- * so assume that the clocks are enabled by default.
- * Therefore, dummy clocks are used.
- */
- dummy_clk_sgasyncd16: dummy-clk-sgasyncd16 {
- compatible = "fixed-clock";
- #clock-cells = <0>;
- clock-frequency = <66666000>;
- };
-
- dummy_clk_sgasyncd4: dummy-clk-sgasyncd4 {
- compatible = "fixed-clock";
- #clock-cells = <0>;
- clock-frequency = <266660000>;
- };
-
extal_clk: extal-clk {
compatible = "fixed-clock";
#clock-cells = <0>;
@@ -882,7 +866,9 @@ scif0: serial@c0700000 {
"renesas,rcar-gen5-scif", "renesas,scif";
reg = <0 0xc0700000 0 0x40>;
interrupts = <GIC_ESPI 10 IRQ_TYPE_LEVEL_HIGH>;
- clocks = <&dummy_clk_sgasyncd16>, <&dummy_clk_sgasyncd4>, <&scif_clk>;
+ clocks = <&cpg R8A78000_CPG_SGASYNCD16_PERW_BUS>,
+ <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
+ <&scif_clk>;
clock-names = "fck", "brg_int", "scif_clk";
status = "disabled";
};
@@ -892,7 +878,9 @@ scif1: serial@c0704000 {
"renesas,rcar-gen5-scif", "renesas,scif";
reg = <0 0xc0704000 0 0x40>;
interrupts = <GIC_ESPI 11 IRQ_TYPE_LEVEL_HIGH>;
- clocks = <&dummy_clk_sgasyncd16>, <&dummy_clk_sgasyncd4>, <&scif_clk>;
+ clocks = <&cpg R8A78000_CPG_SGASYNCD16_PERW_BUS>,
+ <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
+ <&scif_clk>;
clock-names = "fck", "brg_int", "scif_clk";
status = "disabled";
};
@@ -902,7 +890,9 @@ scif3: serial@c0708000 {
"renesas,rcar-gen5-scif", "renesas,scif";
reg = <0 0xc0708000 0 0x40>;
interrupts = <GIC_ESPI 12 IRQ_TYPE_LEVEL_HIGH>;
- clocks = <&dummy_clk_sgasyncd16>, <&dummy_clk_sgasyncd4>, <&scif_clk>;
+ clocks = <&cpg R8A78000_CPG_SGASYNCD16_PERW_BUS>,
+ <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
+ <&scif_clk>;
clock-names = "fck", "brg_int", "scif_clk";
status = "disabled";
};
@@ -912,7 +902,9 @@ scif4: serial@c070c000 {
"renesas,rcar-gen5-scif", "renesas,scif";
reg = <0 0xc070c000 0 0x40>;
interrupts = <GIC_ESPI 13 IRQ_TYPE_LEVEL_HIGH>;
- clocks = <&dummy_clk_sgasyncd16>, <&dummy_clk_sgasyncd4>, <&scif_clk>;
+ clocks = <&cpg R8A78000_CPG_SGASYNCD16_PERW_BUS>,
+ <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
+ <&scif_clk>;
clock-names = "fck", "brg_int", "scif_clk";
status = "disabled";
};
@@ -922,7 +914,9 @@ hscif0: serial@c0710000 {
"renesas,rcar-gen5-hscif", "renesas,hscif";
reg = <0 0xc0710000 0 0x60>;
interrupts = <GIC_ESPI 14 IRQ_TYPE_LEVEL_HIGH>;
- clocks = <&dummy_clk_sgasyncd4>, <&dummy_clk_sgasyncd4>, <&scif_clk>;
+ clocks = <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
+ <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
+ <&scif_clk>;
clock-names = "fck", "brg_int", "scif_clk";
status = "disabled";
};
@@ -932,7 +926,9 @@ hscif1: serial@c0714000 {
"renesas,rcar-gen5-hscif", "renesas,hscif";
reg = <0 0xc0714000 0 0x60>;
interrupts = <GIC_ESPI 15 IRQ_TYPE_LEVEL_HIGH>;
- clocks = <&dummy_clk_sgasyncd4>, <&dummy_clk_sgasyncd4>, <&scif_clk>;
+ clocks = <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
+ <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
+ <&scif_clk>;
clock-names = "fck", "brg_int", "scif_clk";
status = "disabled";
};
@@ -942,7 +938,9 @@ hscif2: serial@c0718000 {
"renesas,rcar-gen5-hscif", "renesas,hscif";
reg = <0 0xc0718000 0 0x60>;
interrupts = <GIC_ESPI 16 IRQ_TYPE_LEVEL_HIGH>;
- clocks = <&dummy_clk_sgasyncd4>, <&dummy_clk_sgasyncd4>, <&scif_clk>;
+ clocks = <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
+ <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
+ <&scif_clk>;
clock-names = "fck", "brg_int", "scif_clk";
status = "disabled";
};
@@ -952,7 +950,9 @@ hscif3: serial@c071c000 {
"renesas,rcar-gen5-hscif", "renesas,hscif";
reg = <0 0xc071c000 0 0x60>;
interrupts = <GIC_ESPI 17 IRQ_TYPE_LEVEL_HIGH>;
- clocks = <&dummy_clk_sgasyncd4>, <&dummy_clk_sgasyncd4>, <&scif_clk>;
+ clocks = <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
+ <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
+ <&scif_clk>;
clock-names = "fck", "brg_int", "scif_clk";
status = "disabled";
};
@@ -965,6 +965,15 @@ stcm_transport: sram@c1060000 {
ranges = <0 0x0 0xc1060000 0x1c00>;
/* actual transport nodes must be set per board file */
};
+
+ cpg: clock-controller@c1320000 {
+ compatible = "renesas,r8a78000-cpg";
+ reg = <0 0xc1320000 0 0x10000>;
+ clocks = <&extal_clk>, <&extalr_clk>;
+ clock-names = "extal", "extalr";
+ #clock-cells = <1>;
+ bootph-all;
+ };
};
timer {
--
2.43.0