[PATCH v2 0/6] R-Car X5H CPG/MDLC support

[PATCH v2 0/6] R-Car X5H CPG/MDLC support

[Geert Uytterhoeven]

	Hi all,

This patch series adds minimal support for the Renesas R-Car X5H Clock
Pulse Generator (CPG) and Module Controller (MDLC), to aim for replacing
the dummy clocks in r8a78000.dtsi with proper hardware description.
These two components are closely related, in the sense that they are
both supposed to be accessed through the ARM System Control and
Management Interface (SCMI) on the Ironhide development board.

This series consists of three parts:
  1. Patches 1-2 add DT bindings and DT binding definitions,
  2. Patches 3-4 add minimal CPG and MDLC drivers,
  3. Patches 5-6 update the DTS.

Some of these patches have been sent before as part of "[PATCH/RFC
00/14] R-Car X5H Ironhide SCMI CPG/MDLC remapping"[1], hence the v2.
However, this series does not use or rely on SCMI in any way.

Major changes compared to v1[1] (more detail in the individual patches):
  - Add default support not using SCMI,
  - Drop everything related to SCMI.

SCMI remapping support will be added in a subsequent series[2].
Full hardware support without using SCMI could be added, too, if anyone
would care about that use case.

For testing, I have pushed this series plus additional work to[3].

Thanks for your comments!

[1] "[PATCH/RFC 00/14] R-Car X5H Ironhide SCMI CPG/MDLC remapping"
    https://lore.kernel.org/cover.1776793163.git.geert+renesas@glider.be
[2] "[PATCH v2 00/10] R-Car X5H Ironhide CPG/MDLC SCMI remapping support"
    https://lore.kernel.org/cover.1783505329.git.geert+renesas@glider.be
[3] topic/rcar-x5h-ironhide-scmi-cpg-mdlc-remapping-v2 branch of
    https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git

Geert Uytterhoeven (6):
  dt-bindings: clock: Document Renesas R-Car X5H Clock Pulse Generator
  dt-bindings: power: Document Renesas R-Car X5H Module Controller
  clk: renesas: Add R-Car X5H CPG driver
  pmdomain: renesas: Add R-Car X5H MDLC driver
  arm64: dts: renesas: r8a78000: Add CPG node
  arm64: dts: renesas: r8a78000: Add MDLC nodes

 .../bindings/clock/renesas,r8a78000-cpg.yaml  |  55 +++
 .../bindings/power/renesas,r8a78000-mdlc.yaml |  61 ++++
 arch/arm64/boot/dts/renesas/r8a78000.dtsi     | 300 ++++++++++++++--
 drivers/clk/renesas/Kconfig                   |   4 +
 drivers/clk/renesas/Makefile                  |   1 +
 drivers/clk/renesas/r8a78000-cpg.c            | 216 ++++++++++++
 drivers/pmdomain/renesas/Kconfig              |   4 +
 drivers/pmdomain/renesas/Makefile             |   1 +
 drivers/pmdomain/renesas/r8a78000-mdlc.c      | 329 ++++++++++++++++++
 drivers/soc/renesas/Kconfig                   |   1 +
 .../dt-bindings/clock/renesas,r8a78000-cpg.h  |  14 +
 .../dt-bindings/power/renesas,r8a78000-mdlc.h |  15 +
 12 files changed, 976 insertions(+), 25 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/clock/renesas,r8a78000-cpg.yaml
 create mode 100644 Documentation/devicetree/bindings/power/renesas,r8a78000-mdlc.yaml
 create mode 100644 drivers/clk/renesas/r8a78000-cpg.c
 create mode 100644 drivers/pmdomain/renesas/r8a78000-mdlc.c
 create mode 100644 include/dt-bindings/clock/renesas,r8a78000-cpg.h
 create mode 100644 include/dt-bindings/power/renesas,r8a78000-mdlc.h

-- 
2.43.0

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

[PATCH v2 1/6] dt-bindings: clock: Document Renesas R-Car X5H Clock Pulse Generator

[Geert Uytterhoeven]

Document support for the Renesas R-Car X5H Clock Pulse Generator, and
add binding definitions for a limited initial set of clocks.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Tested-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
---
v2:
  - Add Reviewed-by, Tested-by,
  - Drop preliminary,
  - Expand CPG acronym,
  - Drop R8A78000_CPG_MSOCK_PERW_BUS,
  - Add R8A78000_CPG_SGASYNCD8_PERW_BUS, to avoid holes in the
    SGASYNCDn_PERW_BUS sequence,
  - Drop firmware property.
---
 .../bindings/clock/renesas,r8a78000-cpg.yaml  | 55 +++++++++++++++++++
 .../dt-bindings/clock/renesas,r8a78000-cpg.h  | 14 +++++
 2 files changed, 69 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/renesas,r8a78000-cpg.yaml
 create mode 100644 include/dt-bindings/clock/renesas,r8a78000-cpg.h

diff --git a/Documentation/devicetree/bindings/clock/renesas,r8a78000-cpg.yaml b/Documentation/devicetree/bindings/clock/renesas,r8a78000-cpg.yaml
new file mode 100644
index 0000000000000000..4e23bba334382346
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/renesas,r8a78000-cpg.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/renesas,r8a78000-cpg.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas R-Car X5H Clock Pulse Generator
+
+maintainers:
+  - Geert Uytterhoeven <geert+renesas@glider.be>
+
+description:
+  The R-Car X5H Clock Pulse Generator (CLK CONTROL) consists of oscillators,
+  PLL circuits, clock dividers and clock control circuits.  It provides various
+  clocks for other modules.
+
+properties:
+  compatible:
+    const: renesas,r8a78000-cpg
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 2
+
+  clock-names:
+    items:
+      - const: extal
+      - const: extalr
+
+  '#clock-cells':
+    description:
+      The single clock specifier cell must be the clock number, as defined in
+      <dt-bindings/clock/renesas,r8a78000-cpg.h>.
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - '#clock-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    clock-controller@c1320000 {
+            compatible = "renesas,r8a78000-cpg";
+            reg = <0xc1320000 0x10000>;
+            clocks = <&extal_clk>, <&extalr_clk>;
+            clock-names = "extal", "extalr";
+            #clock-cells = <1>;
+    };
diff --git a/include/dt-bindings/clock/renesas,r8a78000-cpg.h b/include/dt-bindings/clock/renesas,r8a78000-cpg.h
new file mode 100644
index 0000000000000000..7fd09a3fb353d952
--- /dev/null
+++ b/include/dt-bindings/clock/renesas,r8a78000-cpg.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/*
+ * Copyright (C) 2026 Glider bv
+ */
+#ifndef __DT_BINDINGS_CLOCK_RENESAS_R8A78000_CPG_H__
+#define __DT_BINDINGS_CLOCK_RENESAS_R8A78000_CPG_H__
+
+/* R-Car X5H Clock Pulse Generator Clocks */
+
+#define R8A78000_CPG_SGASYNCD4_PERW_BUS		0
+#define R8A78000_CPG_SGASYNCD8_PERW_BUS		1
+#define R8A78000_CPG_SGASYNCD16_PERW_BUS	2
+
+#endif /* __DT_BINDINGS_CLOCK_RENESAS_R8A78000_CPG_H__ */
-- 
2.43.0

[PATCH v2 2/6] dt-bindings: power: Document Renesas R-Car X5H Module Controller

[Geert Uytterhoeven]

Document support for Renesas R-Car X5H Module Controllers, and add
binding definitions for power domains not backed by registers.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v2:
  - Clarify the meaning of the two power domain cells and the reset
    cell,
  - Drop R8A78000_MDLC_PD_CMN, as CMN is backed by MDPG bits,
  - Expand MDLC acronym,
  - Add a comment stating that all R8A78000_MDLC_PD_* definitions are
    for always-on power domains,
  - Drop firmware property.
---
 .../bindings/power/renesas,r8a78000-mdlc.yaml | 61 +++++++++++++++++++
 .../dt-bindings/power/renesas,r8a78000-mdlc.h | 15 +++++
 2 files changed, 76 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/renesas,r8a78000-mdlc.yaml
 create mode 100644 include/dt-bindings/power/renesas,r8a78000-mdlc.h

diff --git a/Documentation/devicetree/bindings/power/renesas,r8a78000-mdlc.yaml b/Documentation/devicetree/bindings/power/renesas,r8a78000-mdlc.yaml
new file mode 100644
index 0000000000000000..1dba1e1b1c5b52d0
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/renesas,r8a78000-mdlc.yaml
@@ -0,0 +1,61 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/renesas,r8a78000-mdlc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas R-Car X5H Module Controller
+
+maintainers:
+  - Geert Uytterhoeven <geert+renesas@glider.be>
+
+description:
+  Each instance of the R-Car X5H Module Controller (MODULE CONTROL) provides
+  Power Gating for up to 64 Power Domains, and Module Standby and Reset for up
+  to 256 modules in the Power Domain of each Module hierarchy.
+
+properties:
+  compatible:
+    const: renesas,r8a78000-mdlc
+
+  reg:
+    maxItems: 1
+
+  '#power-domain-cells':
+    description: |
+      - The first power domain specifier cell is the power domain part, and
+        must be either the Module Power Domain Gating (MPDG) register index
+        (0x00-0x3f) from the datasheet, for power domains which are backed by
+        MPDG bits and which can be controlled in that manner,  or a Power
+        Domain number, as defined in
+        <dt-bindings/power/renesas,r8a78000-mdlc.h>, for power domains which
+        are always on, and for which there are no MPDG bits to control them.
+
+      - The second power domain specifier cell is the module standby part, and
+        must be the module number (0x00-0xff), composed of the Module System
+        Reset (MSRES) register index in the high nibble, and the Module Reset
+        Destination bitfield index in the low nibble.
+    const: 2
+
+  '#reset-cells':
+    description:
+      The single reset specifier cell must be the module number (0x00-0xff),
+      and thus identical to the second power domain specifier cell.
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - '#power-domain-cells'
+  - '#reset-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    system-controller@c3060000 {
+            compatible = "renesas,r8a78000-mdlc";
+            reg = <0xc3060000 0x1000>;
+            #power-domain-cells = <2>;
+            #reset-cells = <1>;
+    };
diff --git a/include/dt-bindings/power/renesas,r8a78000-mdlc.h b/include/dt-bindings/power/renesas,r8a78000-mdlc.h
new file mode 100644
index 0000000000000000..6f3d1ae23648e55b
--- /dev/null
+++ b/include/dt-bindings/power/renesas,r8a78000-mdlc.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/*
+ * Copyright (C) 2026 Glider bv
+ */
+#ifndef __DT_BINDINGS_POWER_RENESAS_R8A78000_MDLC_H__
+#define __DT_BINDINGS_POWER_RENESAS_R8A78000_MDLC_H__
+
+/* R-Car X5H Module Controller Always-On Power Domains */
+
+#define R8A78000_MDLC_PD_AON			0x40
+#define R8A78000_MDLC_PD_SCP			0x41
+#define R8A78000_MDLC_PD_APL			0x42
+#define R8A78000_MDLC_PD_ACL			0x43
+
+#endif /* __DT_BINDINGS_POWER_RENESAS_R8A78000_MDLC_H__ */
-- 
2.43.0

[PATCH v2 3/6] clk: renesas: Add R-Car X5H CPG driver

[Geert Uytterhoeven]

Add a minimal Clock Pulse Generator driver for the R-Car X5H (R8A78000)
SoC.  For now this supports just the few fixed-rate clocks that are
needed by the current minimal DTS.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v2:
  - Spin off from "clk: renesas: Add R-Car X5H CPG SCMI remapping
    driver",
  - Add default support not using SCMI,
  - Drop all SCMI remapping support,
  - Document use of -1 as a sentinel,
  - Document use of FIXED_CLK() IDs.
---
 drivers/clk/renesas/Kconfig        |   4 +
 drivers/clk/renesas/Makefile       |   1 +
 drivers/clk/renesas/r8a78000-cpg.c | 216 +++++++++++++++++++++++++++++
 3 files changed, 221 insertions(+)
 create mode 100644 drivers/clk/renesas/r8a78000-cpg.c

diff --git a/drivers/clk/renesas/Kconfig b/drivers/clk/renesas/Kconfig
index 0203ecbb38825f13..f0482bdfc4616cfa 100644
--- a/drivers/clk/renesas/Kconfig
+++ b/drivers/clk/renesas/Kconfig
@@ -34,6 +34,7 @@ config CLK_RENESAS
 	select CLK_R8A779F0 if ARCH_R8A779F0
 	select CLK_R8A779G0 if ARCH_R8A779G0
 	select CLK_R8A779H0 if ARCH_R8A779H0
+	select CLK_R8A78000 if ARCH_R8A78000
 	select CLK_R9A06G032 if ARCH_R9A06G032
 	select CLK_R9A07G043 if ARCH_R9A07G043
 	select CLK_R9A07G044 if ARCH_R9A07G044
@@ -176,6 +177,9 @@ config CLK_R8A779H0
 	bool "R-Car V4M clock support" if COMPILE_TEST
 	select CLK_RCAR_GEN4_CPG
 
+config CLK_R8A78000
+	bool "R-Car X5H clock support" if COMPILE_TEST
+
 config CLK_R9A06G032
 	bool "RZ/N1D clock support" if COMPILE_TEST
 
diff --git a/drivers/clk/renesas/Makefile b/drivers/clk/renesas/Makefile
index bd2bed91ab291d72..4f76f8c402ffe9a3 100644
--- a/drivers/clk/renesas/Makefile
+++ b/drivers/clk/renesas/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_CLK_R8A779A0)		+= r8a779a0-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A779F0)		+= r8a779f0-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A779G0)		+= r8a779g0-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A779H0)		+= r8a779h0-cpg-mssr.o
+obj-$(CONFIG_CLK_R8A78000)		+= r8a78000-cpg.o
 obj-$(CONFIG_CLK_R9A06G032)		+= r9a06g032-clocks.o
 obj-$(CONFIG_CLK_R9A07G043)		+= r9a07g043-cpg.o
 obj-$(CONFIG_CLK_R9A07G044)		+= r9a07g044-cpg.o
diff --git a/drivers/clk/renesas/r8a78000-cpg.c b/drivers/clk/renesas/r8a78000-cpg.c
new file mode 100644
index 0000000000000000..c53d8f33ee88b339
--- /dev/null
+++ b/drivers/clk/renesas/r8a78000-cpg.c
@@ -0,0 +1,216 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * R-Car X5H Clock Pulse Generator
+ *
+ * Copyright (C) 2026 Glider bv
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/dev_printk.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <dt-bindings/clock/renesas,r8a78000-cpg.h>
+
+struct clk_map_in {
+	int dt_id;		/* DT binding clock ID or -1 sentinel */
+	u32 fw_id;		/* FIXED_CLK() ID */
+};
+
+struct clk_map {
+	int dt_id;		/* DT binding clock ID or -1 sentinel */
+	u32 fw_id;		/* FIXED_CLK() ID */
+	struct clk_hw *hw;
+};
+
+enum fixed_clk {
+	FIXED_CLK_66M,
+	FIXED_CLK_266M,
+	NUM_FIXED_CLKS
+};
+
+static const unsigned long fixed_clk_rates[NUM_FIXED_CLKS] = {
+	[FIXED_CLK_66M] = 66666000,
+	[FIXED_CLK_266M] = 266660000,
+};
+
+#define FIXED_CLK(rate)		FIXED_CLK_ ## rate
+
+/**
+ * struct r8a78000_cpg_priv - Clock Pulse Generator Private Data
+ *
+ * @dev: CPG device
+ * @map: Mapping from DT clock IDs
+ * @fixed_hws: Fixed rate clocks
+ */
+struct r8a78000_cpg_priv {
+	struct device *dev;
+	const struct clk_map *map;
+	struct clk_hw *fixed_hws[NUM_FIXED_CLKS];
+};
+
+static const struct clk_map *clk_map_find(const struct clk_map *map, u32 id)
+{
+	if (!map)
+		return NULL;
+
+	for (; map->dt_id >= 0; map++) {
+		if (map->dt_id == id)
+			return map;
+	}
+
+	return NULL;
+}
+
+static struct clk_hw *r8a78000_clk_get(struct of_phandle_args *spec,
+				      void *data)
+{
+	struct r8a78000_cpg_priv *priv = data;
+	struct device *dev = priv->dev;
+	const struct clk_map *map;
+	struct clk_hw *hw;
+	u32 id;
+
+	if (spec->args_count != 1)
+		return ERR_PTR(-EINVAL);
+
+	id = spec->args[0];
+
+	map = clk_map_find(priv->map, id);
+	if (!map) {
+		dev_err(dev, "Unknown clock %u\n", id);
+		return ERR_PTR(-ENOENT);
+	}
+
+	dev_dbg(dev, "Mapping DT clock %u to fixed clock %u\n", id, map->fw_id);
+
+	hw = map->hw;
+
+	dev_dbg(dev, "clock %u is %s at %lu Hz\n", id, clk_hw_get_name(hw),
+		clk_hw_get_rate(hw));
+
+	return hw;
+}
+
+static void unregister_fixed_clks(void *data)
+{
+	struct r8a78000_cpg_priv *priv = data;
+
+	for (unsigned int i = 0; i < ARRAY_SIZE(priv->fixed_hws); i++)
+		clk_hw_unregister_fixed_rate(priv->fixed_hws[i]);
+}
+
+static int register_fixed_clks(struct r8a78000_cpg_priv *priv)
+{
+	struct device *dev = priv->dev;
+	unsigned long rate;
+	struct clk_hw *hw;
+	const char *name;
+
+	for (unsigned int i = 0; i < ARRAY_SIZE(fixed_clk_rates); i++) {
+		rate = fixed_clk_rates[i];
+		name = devm_kasprintf(dev, GFP_KERNEL, "cpg-%lu", rate);
+		if (!name)
+			return -ENOMEM;
+
+		hw = clk_hw_register_fixed_rate(dev, name, NULL, 0, rate);
+		if (IS_ERR(hw)) {
+			while (i-- > 0)
+				clk_hw_unregister_fixed_rate(priv->fixed_hws[i]);
+			return PTR_ERR(hw);
+		}
+
+		priv->fixed_hws[i] = hw;
+	}
+
+	return devm_add_action_or_reset(dev, unregister_fixed_clks, priv);
+}
+
+static const struct clk_map *fill_clk_map(struct r8a78000_cpg_priv *priv,
+					  const struct clk_map_in *map_in)
+{
+	struct device *dev = priv->dev;
+	struct clk_map *map;
+	unsigned int i;
+
+	for (i = 0; map_in[i].dt_id >= 0; i++) { }
+
+	map = devm_kcalloc(dev, i + 1, sizeof(*map), GFP_KERNEL);
+	if (!map)
+		return ERR_PTR(-ENOMEM);
+
+	for (i = 0; ; i++) {
+		map[i].dt_id = map_in[i].dt_id;
+		if (map[i].dt_id < 0)
+			break;
+
+		map[i].fw_id = map_in[i].fw_id;
+		map[i].hw = priv->fixed_hws[map[i].fw_id];
+		continue;
+	}
+
+	return map;
+}
+
+static int r8a78000_cpg_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct r8a78000_cpg_priv *priv;
+	const struct clk_map_in *map;
+	int ret;
+
+	map = of_device_get_match_data(dev);
+	if (!map)
+		return -ENODEV;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = dev;
+
+	ret = register_fixed_clks(priv);
+	if (ret)
+		return ret;
+
+	/*
+	 * We cannot do lazy look-up in r8a78000_clk_get(), as that function is
+	 * called with of_clk_mutex already held.
+	 */
+	priv->map = fill_clk_map(priv, map);
+	if (IS_ERR(priv->map))
+		return PTR_ERR(priv->map);
+
+	return devm_of_clk_add_hw_provider(dev, r8a78000_clk_get, priv);
+}
+
+static const struct clk_map_in r8a78000_cpg_default[] = {
+	{ R8A78000_CPG_SGASYNCD4_PERW_BUS,	FIXED_CLK(266M) },
+	{ R8A78000_CPG_SGASYNCD16_PERW_BUS,	FIXED_CLK(66M) },
+	{ -1 }
+};
+
+static const struct of_device_id r8a78000_cpg_match[] = {
+	{
+		.compatible = "renesas,r8a78000-cpg",
+		.data = &r8a78000_cpg_default,
+	},
+	{ /* sentinel */ }
+};
+
+static struct platform_driver r8a78000_cpg_driver = {
+	.probe = r8a78000_cpg_probe,
+	.driver = {
+		.name = "r8a78000-cpg",
+		.of_match_table = r8a78000_cpg_match,
+		.suppress_bind_attrs = true,
+	},
+};
+
+builtin_platform_driver(r8a78000_cpg_driver)
+
+MODULE_DESCRIPTION("R-Car X5H CPG Driver");
-- 
2.43.0

[PATCH v2 4/6] pmdomain: renesas: Add R-Car X5H MDLC driver

[Geert Uytterhoeven]

Add a minimal Module Controller driver for the R-Car X5H (R8A78000) SoC.
For now this just supports the always-on power domains, and dummy clocks
and resets for the serial console (which is enabled by the boot loader).

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
Calling genpd_add_provider() instead of of_genpd_add_provider_onecell()
would be sufficient, but the former is private.

v2:
  - Spin off from "pmdomain: renesas: Add R-Car X5H MDLC SCMI remapping
    driver",
  - Add default support not using SCMI,
  - Drop all SCMI remapping support,
  - Document use of -1 as a sentinel,
  - Rename struct r8a78000_mdlc_info to mdlc_info,
  - Print HW IDs in hexadecimal,
  - Reduce log level for unsupported MDLC instances from warn to dbg,
---
 drivers/pmdomain/renesas/Kconfig         |   4 +
 drivers/pmdomain/renesas/Makefile        |   1 +
 drivers/pmdomain/renesas/r8a78000-mdlc.c | 329 +++++++++++++++++++++++
 drivers/soc/renesas/Kconfig              |   1 +
 4 files changed, 335 insertions(+)
 create mode 100644 drivers/pmdomain/renesas/r8a78000-mdlc.c

diff --git a/drivers/pmdomain/renesas/Kconfig b/drivers/pmdomain/renesas/Kconfig
index b507c3e0d723efc6..f2f52d3c29a083f1 100644
--- a/drivers/pmdomain/renesas/Kconfig
+++ b/drivers/pmdomain/renesas/Kconfig
@@ -13,6 +13,10 @@ config SYSC_RMOBILE
 	bool "System Controller support for R-Mobile" if COMPILE_TEST
 
 # SoC
+config MDLC_R8A78000
+	bool "Module Controller support for R8A78000 (R-Car X5H)" if COMPILE_TEST
+	select RESET_CONTROLLER
+
 config SYSC_R8A7742
 	bool "System Controller support for R8A7742 (RZ/G1H)" if COMPILE_TEST
 	select SYSC_RCAR
diff --git a/drivers/pmdomain/renesas/Makefile b/drivers/pmdomain/renesas/Makefile
index 0391e6e67440a786..17849aad37a5ac4f 100644
--- a/drivers/pmdomain/renesas/Makefile
+++ b/drivers/pmdomain/renesas/Makefile
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 # SoC
+obj-$(CONFIG_MDLC_R8A78000)	+= r8a78000-mdlc.o
 obj-$(CONFIG_SYSC_R8A7742)	+= r8a7742-sysc.o
 obj-$(CONFIG_SYSC_R8A7743)	+= r8a7743-sysc.o
 obj-$(CONFIG_SYSC_R8A7745)	+= r8a7745-sysc.o
diff --git a/drivers/pmdomain/renesas/r8a78000-mdlc.c b/drivers/pmdomain/renesas/r8a78000-mdlc.c
new file mode 100644
index 0000000000000000..ed367e921a3341a7
--- /dev/null
+++ b/drivers/pmdomain/renesas/r8a78000-mdlc.c
@@ -0,0 +1,329 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * R-Car X5H Module Controller
+ *
+ * Copyright (C) 2026 Glider bv
+ */
+
+#include <linux/dev_printk.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/reset-controller.h>
+#include <linux/slab.h>
+
+#include <dt-bindings/power/renesas,r8a78000-mdlc.h>
+
+struct mod_map {
+	int hw_id;		/* Hardware module ID or -1 sentinel */
+};
+
+struct mdlc_info {
+	u32 base;
+	const struct mod_map *mod_map;
+};
+
+/**
+ * struct r8a78000_mdlc_priv - Module Controller Private Data
+ *
+ * @link: Link into list of MDLC instances
+ * @genpd_data: PM domain provider data
+ * @rcdev: Reset controller entity
+ * @dev: MDLC device
+ * @np: Device node in DT representing the MDLC
+ * @mod_map: Mapping from hardware module IDs
+ */
+struct r8a78000_mdlc_priv {
+	struct hlist_node link;
+	struct genpd_onecell_data genpd_data;
+	struct reset_controller_dev rcdev;
+	struct device *dev;
+	struct device_node *np;
+	const struct mod_map *mod_map;
+};
+
+static struct generic_pm_domain *r8a78000_genpd_always_on;
+static HLIST_HEAD(r8a78000_mdlc_list);
+static DEFINE_MUTEX(r8a78000_mdlc_lock);	/* protects the two above */
+
+static struct generic_pm_domain *r8a78000_genpd_xlate(
+			const struct of_phandle_args *spec, void *data)
+{
+	struct r8a78000_mdlc_priv *priv = container_of(data,
+					struct r8a78000_mdlc_priv, genpd_data);
+	struct device *dev = priv->dev;
+	u32 id;
+
+	if (spec->args_count != 2)
+		return ERR_PTR(-EINVAL);
+
+	id = spec->args[0];
+
+	if (id >= R8A78000_MDLC_PD_AON) {
+		dev_dbg(dev,
+			"Mapping HW power domain 0x%x to always-on domain\n",
+			id);
+		return r8a78000_genpd_always_on;
+	}
+
+	dev_err(dev, "Unknown power domain 0x%x\n", id);
+	return ERR_PTR(-ENOENT);
+}
+
+#define rcdev_to_priv(_rcdev)	\
+	container_of(_rcdev, struct r8a78000_mdlc_priv, rcdev)
+
+static const struct mod_map *mod_map_find(const struct mod_map *map, u32 id)
+{
+	if (!map)
+		return NULL;
+
+	for (; map->hw_id >= 0; map++) {
+		if (map->hw_id == id)
+			return map;
+	}
+
+	return NULL;
+}
+
+static int r8a78000_mdlc_reset_xlate(struct reset_controller_dev *rcdev,
+				     const struct of_phandle_args *spec)
+{
+	struct r8a78000_mdlc_priv *priv = rcdev_to_priv(rcdev);
+	struct device *dev = priv->dev;
+	const struct mod_map *map;
+	u32 id;
+
+	if (spec->args_count != 1)
+		return -EINVAL;
+
+	id = spec->args[0];
+
+	map = mod_map_find(priv->mod_map, id);
+	if (!map) {
+		dev_err(dev, "Unknown reset 0x%x\n", id);
+		return -ENOENT;
+	}
+
+	dev_dbg(dev, "Ignoring HW reset 0x%x\n", id);
+	return id;
+}
+
+#define DEFINE_MDLC_RESET_WRAPPER(op)					    \
+	static int r8a78000_mdlc_ ## op(struct reset_controller_dev *rcdev, \
+					unsigned long id)		    \
+	{								    \
+		struct r8a78000_mdlc_priv *priv = rcdev_to_priv(rcdev);	    \
+									    \
+		dev_dbg(priv->dev, "%s: Ignoring\n", __func__);		    \
+		return 0;						    \
+	}
+
+DEFINE_MDLC_RESET_WRAPPER(reset)
+DEFINE_MDLC_RESET_WRAPPER(assert)
+DEFINE_MDLC_RESET_WRAPPER(deassert)
+DEFINE_MDLC_RESET_WRAPPER(status)
+
+static const struct reset_control_ops r8a78000_mdlc_reset_ops = {
+	.reset = r8a78000_mdlc_reset,
+	.assert = r8a78000_mdlc_assert,
+	.deassert = r8a78000_mdlc_deassert,
+	.status = r8a78000_mdlc_status,
+};
+
+static int r8a78000_mdlc_attach_dev(struct generic_pm_domain *domain,
+				    struct device *dev)
+{
+	struct device_node *np = dev->of_node;
+	struct r8a78000_mdlc_priv *priv;
+	struct of_phandle_args pd_spec;
+	const struct mod_map *map;
+	unsigned int id;
+	int ret;
+
+	ret = of_parse_phandle_with_args(np, "power-domains",
+					 "#power-domain-cells", 0, &pd_spec);
+	if (ret < 0)
+		return ret;
+
+	if (pd_spec.args_count != 2) {
+		of_node_put(pd_spec.np);
+		return -EINVAL;
+	}
+
+	scoped_guard(mutex, &r8a78000_mdlc_lock) {
+		hlist_for_each_entry(priv, &r8a78000_mdlc_list, link) {
+			if (priv->np == pd_spec.np)
+				break;
+		}
+	}
+
+	if (!priv) {
+		dev_err(dev, "%s: MDLC %pOF not found\n", __func__, pd_spec.np);
+		of_node_put(pd_spec.np);
+		return -ENODEV;
+	}
+
+	id = pd_spec.args[1];
+	of_node_put(pd_spec.np);
+
+	map = mod_map_find(priv->mod_map, id);
+	if (!map) {
+		dev_err(dev, "Unknown module 0x%x\n", id);
+		return -ENOENT;
+	}
+
+	dev_dbg(dev, "Ignoring HW module 0x%x\n", id);
+	return 0;
+}
+
+static void r8a78000_mdlc_unlink(void *data)
+{
+	struct r8a78000_mdlc_priv *priv = data;
+
+	scoped_guard(mutex, &r8a78000_mdlc_lock) {
+		hlist_del(&priv->link);
+	}
+}
+
+static void r8a78000_genpd_del_provider(void *data)
+{
+	of_genpd_del_provider(data);
+}
+
+static int r8a78000_genpd_always_on_singleton(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+	int ret;
+
+	guard(mutex)(&r8a78000_mdlc_lock);
+
+	if (r8a78000_genpd_always_on)
+		return 0;
+
+	genpd = kzalloc_obj(*genpd);
+	if (!genpd)
+		return -ENOMEM;
+
+	genpd->name = "always-on";
+	genpd->attach_dev = r8a78000_mdlc_attach_dev;
+
+	ret = pm_genpd_init(genpd, &pm_domain_always_on_gov, false);
+	if (ret) {
+		kfree(genpd);
+		return dev_err_probe(dev, ret,
+				     "Failed to create always-on domain\n");
+	}
+
+	r8a78000_genpd_always_on = genpd;
+	return 0;
+}
+
+static int r8a78000_mdlc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct r8a78000_mdlc_priv *priv;
+	const struct mdlc_info *info;
+	struct resource *res;
+	int ret;
+
+	ret = r8a78000_genpd_always_on_singleton(dev);
+	if (ret)
+		return ret;
+
+	info = of_device_get_match_data(dev);
+	if (!info)
+		return -ENODEV;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = dev;
+	priv->np = np;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
+
+	for (; info->base; info++) {
+		if (info->base == res->start)
+			break;
+	}
+
+	if (!info->base) {
+		dev_dbg(dev, "Unsupported MDLC instance 0x%pa\n", &res->start);
+		return -ENODEV;
+	}
+
+	priv->mod_map = info->mod_map;
+
+	scoped_guard(mutex, &r8a78000_mdlc_lock) {
+		hlist_add_head(&priv->link, &r8a78000_mdlc_list);
+	}
+
+	ret = devm_add_action_or_reset(dev, r8a78000_mdlc_unlink, priv);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to add action\n");
+
+	/* Note that no actual domains are registered, just need translation */
+	priv->genpd_data.xlate = r8a78000_genpd_xlate;
+	ret = of_genpd_add_provider_onecell(np, &priv->genpd_data);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "Failed to register genpd provider\n");
+
+	ret = devm_add_action_or_reset(dev, r8a78000_genpd_del_provider, np);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "failed to add unregister action\n");
+
+	priv->rcdev.ops = &r8a78000_mdlc_reset_ops;
+	priv->rcdev.of_node = np;
+	priv->rcdev.of_reset_n_cells = 1;
+	priv->rcdev.of_xlate = r8a78000_mdlc_reset_xlate;
+
+	ret = devm_reset_controller_register(dev, &priv->rcdev);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "Failed to register reset controller\n");
+
+	return 0;
+}
+
+static const struct mod_map r8a78000_mdlc_perw_mod_default[] = {
+	{ 0x54 },	/* HSCIF0 */
+	{ -1 },
+};
+
+static const struct mdlc_info r8a78000_mdlc_default[] = {
+	{
+		.base = 0xc05d0000 /* mdlc_perw */,
+		.mod_map = r8a78000_mdlc_perw_mod_default,
+	},
+	{ 0 }
+};
+
+static const struct of_device_id r8a78000_mdlc_match[] = {
+	{
+		.compatible = "renesas,r8a78000-mdlc",
+		.data = &r8a78000_mdlc_default,
+	},
+	{ /* sentinel */ }
+};
+
+static struct platform_driver r8a78000_mdlc_driver = {
+	.probe = r8a78000_mdlc_probe,
+	.driver = {
+		.name = "r8a78000-mdlc",
+		.of_match_table = r8a78000_mdlc_match,
+		.suppress_bind_attrs = true,
+	},
+};
+
+builtin_platform_driver(r8a78000_mdlc_driver)
+
+MODULE_DESCRIPTION("R-Car X5H MDLC Driver");
diff --git a/drivers/soc/renesas/Kconfig b/drivers/soc/renesas/Kconfig
index 2ab150d04bb1f1ef..d4055250de72f1fe 100644
--- a/drivers/soc/renesas/Kconfig
+++ b/drivers/soc/renesas/Kconfig
@@ -358,6 +358,7 @@ config ARCH_R8A78000
 	default y if ARCH_RENESAS
 	default ARCH_RENESAS
 	select ARCH_RCAR_GEN5
+	select MDLC_R8A78000
 	help
 	  This enables support for the Renesas R-Car X5H SoC.
 
-- 
2.43.0

[PATCH v2 5/6] arm64: dts: renesas: r8a78000: Add CPG node

[Geert Uytterhoeven]

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@glider.be>
---
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

[PATCH v2 6/6] arm64: dts: renesas: r8a78000: Add MDLC nodes

[Geert Uytterhoeven]

Add device nodes for the Module Control (MDLC) blocks on the R-Car X5H
(R8A78000) SoC.

Complete hardware desciption of all (H)SCIF serial ports, by linking
them to an MDLC for power domains and resets.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v2:
  - Split in separate CPG and MDLC patches.
---
 arch/arm64/boot/dts/renesas/r8a78000.dtsi | 241 ++++++++++++++++++++++
 1 file changed, 241 insertions(+)

diff --git a/arch/arm64/boot/dts/renesas/r8a78000.dtsi b/arch/arm64/boot/dts/renesas/r8a78000.dtsi
index 1fe078c7822c01a5..c256d7cf22872bbc 100644
--- a/arch/arm64/boot/dts/renesas/r8a78000.dtsi
+++ b/arch/arm64/boot/dts/renesas/r8a78000.dtsi
@@ -6,6 +6,7 @@
  */
 
 #include <dt-bindings/clock/renesas,r8a78000-cpg.h>
+#include <dt-bindings/power/renesas,r8a78000-mdlc.h>
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 
 / {
@@ -870,6 +871,8 @@ scif0: serial@c0700000 {
 				 <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
 				 <&scif_clk>;
 			clock-names = "fck", "brg_int", "scif_clk";
+			power-domains = <&mdlc_perw R8A78000_MDLC_PD_APL 0x40>;
+			resets = <&mdlc_perw 0x40>;
 			status = "disabled";
 		};
 
@@ -882,6 +885,8 @@ scif1: serial@c0704000 {
 				 <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
 				 <&scif_clk>;
 			clock-names = "fck", "brg_int", "scif_clk";
+			power-domains = <&mdlc_perw R8A78000_MDLC_PD_APL 0x41>;
+			resets = <&mdlc_perw 0x41>;
 			status = "disabled";
 		};
 
@@ -894,6 +899,8 @@ scif3: serial@c0708000 {
 				 <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
 				 <&scif_clk>;
 			clock-names = "fck", "brg_int", "scif_clk";
+			power-domains = <&mdlc_perw R8A78000_MDLC_PD_APL 0x42>;
+			resets = <&mdlc_perw 0x42>;
 			status = "disabled";
 		};
 
@@ -906,6 +913,8 @@ scif4: serial@c070c000 {
 				 <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
 				 <&scif_clk>;
 			clock-names = "fck", "brg_int", "scif_clk";
+			power-domains = <&mdlc_perw R8A78000_MDLC_PD_APL 0x43>;
+			resets = <&mdlc_perw 0x43>;
 			status = "disabled";
 		};
 
@@ -918,6 +927,8 @@ hscif0: serial@c0710000 {
 				 <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
 				 <&scif_clk>;
 			clock-names = "fck", "brg_int", "scif_clk";
+			power-domains = <&mdlc_perw R8A78000_MDLC_PD_APL 0x54>;
+			resets = <&mdlc_perw 0x54>;
 			status = "disabled";
 		};
 
@@ -930,6 +941,8 @@ hscif1: serial@c0714000 {
 				 <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
 				 <&scif_clk>;
 			clock-names = "fck", "brg_int", "scif_clk";
+			power-domains = <&mdlc_perw R8A78000_MDLC_PD_APL 0x55>;
+			resets = <&mdlc_perw 0x55>;
 			status = "disabled";
 		};
 
@@ -942,6 +955,8 @@ hscif2: serial@c0718000 {
 				 <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
 				 <&scif_clk>;
 			clock-names = "fck", "brg_int", "scif_clk";
+			power-domains = <&mdlc_perw R8A78000_MDLC_PD_APL 0x56>;
+			resets = <&mdlc_perw 0x56>;
 			status = "disabled";
 		};
 
@@ -954,6 +969,8 @@ hscif3: serial@c071c000 {
 				 <&cpg R8A78000_CPG_SGASYNCD4_PERW_BUS>,
 				 <&scif_clk>;
 			clock-names = "fck", "brg_int", "scif_clk";
+			power-domains = <&mdlc_perw R8A78000_MDLC_PD_APL 0x57>;
+			resets = <&mdlc_perw 0x57>;
 			status = "disabled";
 		};
 
@@ -974,6 +991,230 @@ cpg: clock-controller@c1320000 {
 			#clock-cells = <1>;
 			bootph-all;
 		};
+
+		mdlc_vipn: system-controller@c3060000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xc3060000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_vips: system-controller@c3460000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xc3460000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_vio: system-controller@c5000000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xc5000000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_pere: system-controller@c08f0000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xc08f0000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_perw: system-controller@c05d0000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xc05d0000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_ddr0: system-controller@e8000000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xe8000000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_ddr1: system-controller@e8080000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xe8080000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_ddr2: system-controller@e8100000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xe8100000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_ddr3: system-controller@e8180000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xe8180000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_ddr4: system-controller@e8200000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xe8200000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_ddr5: system-controller@e8280000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xe8280000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_ddr6: system-controller@e8300000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xe8300000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_ddr7: system-controller@e8380000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xe8380000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_hscn: system-controller@c9c90000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xc9c90000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_rt: system-controller@19440000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0x19440000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_top: system-controller@c6480000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xc6480000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_hscs: system-controller@de200000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xde200000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_imn: system-controller@c1990000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xc1990000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_ims: system-controller@c1d90000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xc1d90000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_gpc: system-controller@cb510000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xcb510000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_dsp: system-controller@cbe90000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xcbe90000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_mm: system-controller@e9980000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xe9980000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_npu0: system-controller@d2c30000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xd2c30000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_npu1: system-controller@d6c30000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xd6c30000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_cmnn: system-controller@ca410000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xca410000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_cmns: system-controller@ca510000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xca510000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_scp: system-controller@c1330000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xc1330000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
+
+		mdlc_aon: system-controller@c1338000 {
+			compatible = "renesas,r8a78000-mdlc";
+			reg = <0 0xc1338000 0 0x1000>;
+			#power-domain-cells = <2>;
+			#reset-cells = <1>;
+			bootph-all;
+		};
 	};
 
 	timer {
-- 
2.43.0

Re: [PATCH v2 2/6] dt-bindings: power: Document Renesas R-Car X5H Module Controller

[Marek Vasut]

On 7/8/26 12:15 PM, Geert Uytterhoeven wrote:
> Document support for Renesas R-Car X5H Module Controllers, and add
> binding definitions for power domains not backed by registers.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

Re: [PATCH v2 3/6] clk: renesas: Add R-Car X5H CPG driver

[Marek Vasut]

On 7/8/26 12:15 PM, Geert Uytterhoeven wrote:

[...]

> +static int register_fixed_clks(struct r8a78000_cpg_priv *priv)
> +{
> +	struct device *dev = priv->dev;
> +	unsigned long rate;
> +	struct clk_hw *hw;
> +	const char *name;
> +
> +	for (unsigned int i = 0; i < ARRAY_SIZE(fixed_clk_rates); i++) {
> +		rate = fixed_clk_rates[i];
> +		name = devm_kasprintf(dev, GFP_KERNEL, "cpg-%lu", rate);
> +		if (!name)
> +			return -ENOMEM;
> +
> +		hw = clk_hw_register_fixed_rate(dev, name, NULL, 0, rate);

Would it be viable to use devm_clk_hw_register_fixed_rate() here ?

> +		if (IS_ERR(hw)) {
> +			while (i-- > 0)
> +				clk_hw_unregister_fixed_rate(priv->fixed_hws[i]);
> +			return PTR_ERR(hw);
> +		}
> +
> +		priv->fixed_hws[i] = hw;
> +	}
> +
> +	return devm_add_action_or_reset(dev, unregister_fixed_clks, priv);
> +}
[...]

Re: [PATCH v2 4/6] pmdomain: renesas: Add R-Car X5H MDLC driver

[Marek Vasut]

On 7/8/26 12:15 PM, Geert Uytterhoeven wrote:

[...]

> diff --git a/drivers/soc/renesas/Kconfig b/drivers/soc/renesas/Kconfig
> index 2ab150d04bb1f1ef..d4055250de72f1fe 100644
> --- a/drivers/soc/renesas/Kconfig
> +++ b/drivers/soc/renesas/Kconfig
> @@ -358,6 +358,7 @@ config ARCH_R8A78000
>   	default y if ARCH_RENESAS
>   	default ARCH_RENESAS

I know this ^ is not related to this patch, but is the "default y" and 
"default ARCH_RENESAS" above valid ? I can find exactly one such use of 
Kconfig in the tree.

>   	select ARCH_RCAR_GEN5
> +	select MDLC_R8A78000
>   	help
>   	  This enables support for the Renesas R-Car X5H SoC.
>   

Re: [PATCH v2 5/6] arm64: dts: renesas: r8a78000: Add CPG node

[Marek Vasut]

On 7/8/26 12:15 PM, Geert Uytterhoeven wrote:
> 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@glider.be>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

Re: [PATCH v2 6/6] arm64: dts: renesas: r8a78000: Add MDLC nodes

[Marek Vasut]

On 7/8/26 12:15 PM, Geert Uytterhoeven wrote:
> Add device nodes for the Module Control (MDLC) blocks on the R-Car X5H
> (R8A78000) SoC.
> 
> Complete hardware desciption of all (H)SCIF serial ports, by linking
> them to an MDLC for power domains and resets.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

[...]

> +		mdlc_ddr7: system-controller@e8380000 {
> +			compatible = "renesas,r8a78000-mdlc";
> +			reg = <0 0xe8380000 0 0x1000>;
> +			#power-domain-cells = <2>;
> +			#reset-cells = <1>;
> +			bootph-all;
> +		};
> +
> +		mdlc_hscn: system-controller@c9c90000 {
> +			compatible = "renesas,r8a78000-mdlc";
> +			reg = <0 0xc9c90000 0 0x1000>;
> +			#power-domain-cells = <2>;
> +			#reset-cells = <1>;
> +			bootph-all;
> +		};
> +
> +		mdlc_rt: system-controller@19440000 {

Please keep the list sorted (0x19440000 should be before 0xc9c90000).

> +			compatible = "renesas,r8a78000-mdlc";
> +			reg = <0 0x19440000 0 0x1000>;
> +			#power-domain-cells = <2>;
> +			#reset-cells = <1>;
> +			bootph-all;
> +		};
With that fixed:

Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

Thank you !

Re: [PATCH v2 2/6] dt-bindings: power: Document Renesas R-Car X5H Module Controller

[Conor Dooley]

[-- Attachment #1: Type: text/plain, Size: 75 bytes --]

Acked-by: Conor Dooley <conor.dooley@microchip.com>
pw-bot: not-applicable

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 228 bytes --]

Re: [PATCH v2 1/6] dt-bindings: clock: Document Renesas R-Car X5H Clock Pulse Generator

[Conor Dooley]

[-- Attachment #1: Type: text/plain, Size: 75 bytes --]

Acked-by: Conor Dooley <conor.dooley@microchip.com>
pw-bot: not-applicable

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 228 bytes --]

Re: [PATCH v2 3/6] clk: renesas: Add R-Car X5H CPG driver

[Geert Uytterhoeven]

Hi Marek,

On Wed, 8 Jul 2026 at 23:55, Marek Vasut <marek.vasut@mailbox.org> wrote:
> On 7/8/26 12:15 PM, Geert Uytterhoeven wrote:
> > +static int register_fixed_clks(struct r8a78000_cpg_priv *priv)
> > +{
> > +     struct device *dev = priv->dev;
> > +     unsigned long rate;
> > +     struct clk_hw *hw;
> > +     const char *name;
> > +
> > +     for (unsigned int i = 0; i < ARRAY_SIZE(fixed_clk_rates); i++) {
> > +             rate = fixed_clk_rates[i];
> > +             name = devm_kasprintf(dev, GFP_KERNEL, "cpg-%lu", rate);
> > +             if (!name)
> > +                     return -ENOMEM;
> > +
> > +             hw = clk_hw_register_fixed_rate(dev, name, NULL, 0, rate);
>
> Would it be viable to use devm_clk_hw_register_fixed_rate() here ?

Yes, I think so; thanks!

> > +             if (IS_ERR(hw)) {
> > +                     while (i-- > 0)
> > +                             clk_hw_unregister_fixed_rate(priv->fixed_hws[i]);
> > +                     return PTR_ERR(hw);
> > +             }
> > +
> > +             priv->fixed_hws[i] = hw;
> > +     }
> > +
> > +     return devm_add_action_or_reset(dev, unregister_fixed_clks, priv);

And then this, and unregister_fixed_clks() can go, and
r8a78000_cpg_priv.fixed_hws[] is no longer needed after probe.

> > +}

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH v2 6/6] arm64: dts: renesas: r8a78000: Add MDLC nodes

[Geert Uytterhoeven]

Hi Marek,

On Wed, 8 Jul 2026 at 23:56, Marek Vasut <marek.vasut@mailbox.org> wrote:
> On 7/8/26 12:15 PM, Geert Uytterhoeven wrote:
> > Add device nodes for the Module Control (MDLC) blocks on the R-Car X5H
> > (R8A78000) SoC.
> >
> > Complete hardware desciption of all (H)SCIF serial ports, by linking
> > them to an MDLC for power domains and resets.
> >
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
>
> [...]
>
> > +             mdlc_ddr7: system-controller@e8380000 {
> > +                     compatible = "renesas,r8a78000-mdlc";
> > +                     reg = <0 0xe8380000 0 0x1000>;
> > +                     #power-domain-cells = <2>;
> > +                     #reset-cells = <1>;
> > +                     bootph-all;
> > +             };
> > +
> > +             mdlc_hscn: system-controller@c9c90000 {
> > +                     compatible = "renesas,r8a78000-mdlc";
> > +                     reg = <0 0xc9c90000 0 0x1000>;
> > +                     #power-domain-cells = <2>;
> > +                     #reset-cells = <1>;
> > +                     bootph-all;
> > +             };
> > +
> > +             mdlc_rt: system-controller@19440000 {
>
> Please keep the list sorted (0x19440000 should be before 0xc9c90000).

These are sorted by instance (Module Number), as per Table 18.1
("Target Module hierarchy of Module Power Gating and Module Standby")
in the documentation.  This order is indeed a bit odd, as it differs
from both alphabetical label order (unlike e.g. hscifN), and numerical
unit address order...

Any guidance?

> > +                     compatible = "renesas,r8a78000-mdlc";
> > +                     reg = <0 0x19440000 0 0x1000>;
> > +                     #power-domain-cells = <2>;
> > +                     #reset-cells = <1>;
> > +                     bootph-all;
> > +             };
> With that fixed:
>
> Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

Thanks! ;-)

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH v2 4/6] pmdomain: renesas: Add R-Car X5H MDLC driver

[Geert Uytterhoeven]

Hi Marek,

On Wed, 8 Jul 2026 at 23:55, Marek Vasut <marek.vasut@mailbox.org> wrote:
> On 7/8/26 12:15 PM, Geert Uytterhoeven wrote:
> > --- a/drivers/soc/renesas/Kconfig
> > +++ b/drivers/soc/renesas/Kconfig
> > @@ -358,6 +358,7 @@ config ARCH_R8A78000
> >       default y if ARCH_RENESAS
> >       default ARCH_RENESAS
>
> I know this ^ is not related to this patch, but is the "default y" and
> "default ARCH_RENESAS" above valid ? I can find exactly one such use of
> Kconfig in the tree.

Thanks, both are valid, but sort of duplicates.
I will send a patch to drop the latter, and restore consistency.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH v2 6/6] arm64: dts: renesas: r8a78000: Add MDLC nodes

[Marek Vasut]

On 7/9/26 12:24 PM, Geert Uytterhoeven wrote:

Hello Geert,

>>> +             mdlc_ddr7: system-controller@e8380000 {
>>> +                     compatible = "renesas,r8a78000-mdlc";
>>> +                     reg = <0 0xe8380000 0 0x1000>;
>>> +                     #power-domain-cells = <2>;
>>> +                     #reset-cells = <1>;
>>> +                     bootph-all;
>>> +             };
>>> +
>>> +             mdlc_hscn: system-controller@c9c90000 {
>>> +                     compatible = "renesas,r8a78000-mdlc";
>>> +                     reg = <0 0xc9c90000 0 0x1000>;
>>> +                     #power-domain-cells = <2>;
>>> +                     #reset-cells = <1>;
>>> +                     bootph-all;
>>> +             };
>>> +
>>> +             mdlc_rt: system-controller@19440000 {
>>
>> Please keep the list sorted (0x19440000 should be before 0xc9c90000).
> 
> These are sorted by instance (Module Number), as per Table 18.1
> ("Target Module hierarchy of Module Power Gating and Module Standby")
> in the documentation.  This order is indeed a bit odd, as it differs
> from both alphabetical label order (unlike e.g. hscifN), and numerical
> unit address order...
> 
> Any guidance?
Do you think those MDLC instances might be on different sub-busses and 
we might need to model those busses using simple-bus in DT ?