[PATCH 07/10] clk: renesas: Add support for RZ/G2M v3.0

From: Ayman Chaudhry

Date: Fri Aug 21 2026 - 11:10:51 EST

Add initial support for Renesas RZ/G2M v3.0 (a.k.a. R8A774A3) SoC,
including basic core clocks, and SCIF2 (serial console) and INTC-AP
(GIC) module clocks. The RZ/G2M v3.0 CPG is similar to the RZ/G2M v1.3,
however it lacks some modules such as the FCPCI.

Signed-off-by: Ayman Chaudhry <ayman.chaudhry.kc@xxxxxxxxxxx>
---
drivers/clk/renesas/Kconfig | 5 +
drivers/clk/renesas/Makefile | 1 +
drivers/clk/renesas/r8a774a3-cpg-mssr.c | 168 ++++++++++++++++++++++++
drivers/clk/renesas/renesas-cpg-mssr.c | 6 +
drivers/clk/renesas/renesas-cpg-mssr.h | 1 +
5 files changed, 181 insertions(+)
create mode 100644 drivers/clk/renesas/r8a774a3-cpg-mssr.c

diff --git a/drivers/clk/renesas/Kconfig b/drivers/clk/renesas/Kconfig
index 17b95a2e96fb..86d1c48c2cec 100644
--- a/drivers/clk/renesas/Kconfig
+++ b/drivers/clk/renesas/Kconfig
@@ -13,6 +13,7 @@ config CLK_RENESAS
select CLK_R8A7745 if ARCH_R8A7745
select CLK_R8A77470 if ARCH_R8A77470
select CLK_R8A774A1 if ARCH_R8A774A1
+ select CLK_R8A774A3 if ARCH_R8A774A3
select CLK_R8A774B1 if ARCH_R8A774B1
select CLK_R8A774C0 if ARCH_R8A774C0
select CLK_R8A774E1 if ARCH_R8A774E1
@@ -93,6 +94,10 @@ config CLK_R8A774A1
bool "RZ/G2M clock support" if COMPILE_TEST
select CLK_RCAR_GEN3_CPG

+config CLK_R8A774A3
+ bool "RZ/G2M v3.0 clock support" if COMPILE_TEST
+ select CLK_RCAR_GEN3_CPG
+
config CLK_R8A774B1
bool "RZ/G2N clock support" if COMPILE_TEST
select CLK_RCAR_GEN3_CPG
diff --git a/drivers/clk/renesas/Makefile b/drivers/clk/renesas/Makefile
index 658f8aac5127..5c1b798118db 100644
--- a/drivers/clk/renesas/Makefile
+++ b/drivers/clk/renesas/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_CLK_R8A7743) += r8a7743-cpg-mssr.o
obj-$(CONFIG_CLK_R8A7745) += r8a7745-cpg-mssr.o
obj-$(CONFIG_CLK_R8A77470) += r8a77470-cpg-mssr.o
obj-$(CONFIG_CLK_R8A774A1) += r8a774a1-cpg-mssr.o
+obj-$(CONFIG_CLK_R8A774A3) += r8a774a3-cpg-mssr.o
obj-$(CONFIG_CLK_R8A774B1) += r8a774b1-cpg-mssr.o
obj-$(CONFIG_CLK_R8A774C0) += r8a774c0-cpg-mssr.o
obj-$(CONFIG_CLK_R8A774E1) += r8a774e1-cpg-mssr.o
diff --git a/drivers/clk/renesas/r8a774a3-cpg-mssr.c b/drivers/clk/renesas/r8a774a3-cpg-mssr.c
new file mode 100644
index 000000000000..327e529c562b
--- /dev/null
+++ b/drivers/clk/renesas/r8a774a3-cpg-mssr.c
@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * r8a774a3 Clock Pulse Generator / Module Standby and Software Reset
+ *
+ * Copyright (C) 2026 Renesas Electronics Corp.
+ *
+ * Based on r8a7796-cpg-mssr.c
+ *
+ * Copyright (C) 2016 Glider bvba
+ */
+
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/soc/renesas/rcar-rst.h>
+
+#include <dt-bindings/clock/r8a774a3-cpg-mssr.h>
+
+#include "renesas-cpg-mssr.h"
+#include "rcar-gen3-cpg.h"
+
+enum clk_ids {
+ /* Core Clock Outputs exported to DT */
+ LAST_DT_CORE_CLK = R8A774A3_CLK_OSC,
+
+ /* External Input Clocks */
+ CLK_EXTAL,
+ CLK_EXTALR,
+
+ /* Internal Core Clocks */
+ CLK_MAIN,
+ CLK_PLL0,
+ CLK_PLL1,
+ CLK_PLL2,
+ CLK_PLL3,
+ CLK_PLL4,
+ CLK_PLL1_DIV2,
+ CLK_PLL1_DIV4,
+ CLK_S0,
+ CLK_S1,
+ CLK_S2,
+ CLK_S3,
+
+ /* Module Clocks */
+ MOD_CLK_BASE
+};
+
+static const struct cpg_core_clk r8a774a3_core_clks[] __initconst = {
+ /* External Clock Inputs */
+ DEF_INPUT("extal", CLK_EXTAL),
+ DEF_INPUT("extalr", CLK_EXTALR),
+
+ /* Internal Core Clocks */
+ DEF_BASE(".main", CLK_MAIN, CLK_TYPE_GEN3_MAIN, CLK_EXTAL),
+ DEF_BASE(".pll0", CLK_PLL0, CLK_TYPE_GEN3_PLL0, CLK_MAIN),
+ DEF_BASE(".pll1", CLK_PLL1, CLK_TYPE_GEN3_PLL1, CLK_MAIN),
+ DEF_BASE(".pll2", CLK_PLL2, CLK_TYPE_GEN3_PLL2, CLK_MAIN),
+
+ DEF_FIXED(".pll1_div2", CLK_PLL1_DIV2, CLK_PLL1, 2, 1),
+ DEF_FIXED(".s0", CLK_S0, CLK_PLL1_DIV2, 2, 1),
+ DEF_FIXED(".s3", CLK_S3, CLK_PLL1_DIV2, 6, 1),
+
+ /* Core Clock Outputs */
+ DEF_GEN3_Z("z", R8A774A3_CLK_Z, CLK_TYPE_GEN3_Z, CLK_PLL0, 2, 8),
+ DEF_GEN3_Z("z2", R8A774A3_CLK_Z2, CLK_TYPE_GEN3_Z, CLK_PLL2, 2, 0),
+ DEF_FIXED("s0d3", R8A774A3_CLK_S0D3, CLK_S0, 3, 1),
+ DEF_FIXED("s3d1", R8A774A3_CLK_S3D1, CLK_S3, 1, 1),
+ DEF_FIXED("s3d4", R8A774A3_CLK_S3D4, CLK_S3, 4, 1),
+};
+
+static const struct mssr_mod_clk r8a774a3_mod_clks[] __initconst = {
+ DEF_MOD("scif2", 310, R8A774A3_CLK_S3D4),
+ DEF_MOD("intc-ap", 408, R8A774A3_CLK_S0D3),
+};
+
+static const unsigned int r8a774a3_crit_mod_clks[] __initconst = {
+ MOD_CLK_ID(408), /* INTC-AP (GIC) */
+};
+
+/*
+ * CPG Clock Data
+ */
+
+/*
+ * MD EXTAL PLL0 PLL1 PLL2 PLL3 PLL4 OSC
+ * 14 13 19 17 (MHz)
+ *-------------------------------------------------------------------------
+ * 0 0 0 0 16.66 x 1 x180 x192 x144 x192 x144 /16
+ * 0 0 0 1 16.66 x 1 x180 x192 x144 x128 x144 /16
+ * 0 0 1 0 Prohibited setting
+ * 0 0 1 1 16.66 x 1 x180 x192 x144 x192 x144 /16
+ * 0 1 0 0 20 x 1 x150 x160 x120 x160 x120 /19
+ * 0 1 0 1 20 x 1 x150 x160 x120 x106 x120 /19
+ * 0 1 1 0 Prohibited setting
+ * 0 1 1 1 20 x 1 x150 x160 x120 x160 x120 /19
+ * 1 0 0 0 25 x 1 x120 x128 x96 x128 x96 /24
+ * 1 0 0 1 25 x 1 x120 x128 x96 x84 x96 /24
+ * 1 0 1 0 Prohibited setting
+ * 1 0 1 1 25 x 1 x120 x128 x96 x128 x96 /24
+ * 1 1 0 0 33.33 / 2 x180 x192 x144 x192 x144 /32
+ * 1 1 0 1 33.33 / 2 x180 x192 x144 x128 x144 /32
+ * 1 1 1 0 Prohibited setting
+ * 1 1 1 1 33.33 / 2 x180 x192 x144 x192 x144 /32
+ */
+#define CPG_PLL_CONFIG_INDEX(md) ((((md) & BIT(14)) >> 11) | \
+ (((md) & BIT(13)) >> 11) | \
+ (((md) & BIT(19)) >> 18) | \
+ (((md) & BIT(17)) >> 17))
+
+static const struct rcar_gen3_cpg_pll_config cpg_pll_configs[16] __initconst = {
+ /* EXTAL div PLL1 mult/div PLL3 mult/div OSC prediv */
+ { 1, 192, 1, 192, 1, 16, },
+ { 1, 192, 1, 128, 1, 16, },
+ { 0, /* Prohibited setting */ },
+ { 1, 192, 1, 192, 1, 16, },
+ { 1, 160, 1, 160, 1, 19, },
+ { 1, 160, 1, 106, 1, 19, },
+ { 0, /* Prohibited setting */ },
+ { 1, 160, 1, 160, 1, 19, },
+ { 1, 128, 1, 128, 1, 24, },
+ { 1, 128, 1, 84, 1, 24, },
+ { 0, /* Prohibited setting */ },
+ { 1, 128, 1, 128, 1, 24, },
+ { 2, 192, 1, 192, 1, 32, },
+ { 2, 192, 1, 128, 1, 32, },
+ { 0, /* Prohibited setting */ },
+ { 2, 192, 1, 192, 1, 32, },
+};
+
+static int __init r8a774a3_cpg_mssr_init(struct device *dev)
+{
+ const struct rcar_gen3_cpg_pll_config *cpg_pll_config;
+ u32 cpg_mode;
+ int error;
+
+ error = rcar_rst_read_mode_pins(&cpg_mode);
+ if (error)
+ return error;
+
+ cpg_pll_config = &cpg_pll_configs[CPG_PLL_CONFIG_INDEX(cpg_mode)];
+ if (!cpg_pll_config->extal_div) {
+ dev_err(dev, "Prohibited setting (cpg_mode=0x%x)\n", cpg_mode);
+ return -EINVAL;
+ }
+
+ return rcar_gen3_cpg_init(cpg_pll_config, CLK_EXTALR, cpg_mode);
+}
+
+const struct cpg_mssr_info r8a774a3_cpg_mssr_info __initconst = {
+ /* Core Clocks */
+ .core_clks = r8a774a3_core_clks,
+ .num_core_clks = ARRAY_SIZE(r8a774a3_core_clks),
+ .last_dt_core_clk = LAST_DT_CORE_CLK,
+ .num_total_core_clks = MOD_CLK_BASE,
+
+ /* Module Clocks */
+ .mod_clks = r8a774a3_mod_clks,
+ .num_mod_clks = ARRAY_SIZE(r8a774a3_mod_clks),
+ .num_hw_mod_clks = 12 * 32,
+
+ /* Critical Module Clocks */
+ .crit_mod_clks = r8a774a3_crit_mod_clks,
+ .num_crit_mod_clks = ARRAY_SIZE(r8a774a3_crit_mod_clks),
+
+ /* Callbacks */
+ .init = r8a774a3_cpg_mssr_init,
+ .cpg_clk_register = rcar_gen3_cpg_clk_register,
+};
diff --git a/drivers/clk/renesas/renesas-cpg-mssr.c b/drivers/clk/renesas/renesas-cpg-mssr.c
index 80f4403ea2ba..2d815712bbcc 100644
--- a/drivers/clk/renesas/renesas-cpg-mssr.c
+++ b/drivers/clk/renesas/renesas-cpg-mssr.c
@@ -944,6 +944,12 @@ static const struct of_device_id cpg_mssr_match[] = {
.data = &r8a774a1_cpg_mssr_info,
},
#endif
+#ifdef CONFIG_CLK_R8A774A3
+ {
+ .compatible = "renesas,r8a774a3-cpg-mssr",
+ .data = &r8a774a3_cpg_mssr_info,
+ },
+#endif
#ifdef CONFIG_CLK_R8A774B1
{
.compatible = "renesas,r8a774b1-cpg-mssr",
diff --git a/drivers/clk/renesas/renesas-cpg-mssr.h b/drivers/clk/renesas/renesas-cpg-mssr.h
index ad11ab5f0069..3e28bbf50d42 100644
--- a/drivers/clk/renesas/renesas-cpg-mssr.h
+++ b/drivers/clk/renesas/renesas-cpg-mssr.h
@@ -190,6 +190,7 @@ extern const struct cpg_mssr_info r8a7743_cpg_mssr_info;
extern const struct cpg_mssr_info r8a7745_cpg_mssr_info;
extern const struct cpg_mssr_info r8a77470_cpg_mssr_info;
extern const struct cpg_mssr_info r8a774a1_cpg_mssr_info;
+extern const struct cpg_mssr_info r8a774a3_cpg_mssr_info;
extern const struct cpg_mssr_info r8a774b1_cpg_mssr_info;
extern const struct cpg_mssr_info r8a774c0_cpg_mssr_info;
extern const struct cpg_mssr_info r8a774e1_cpg_mssr_info;
--
2.34.1