[PATCH 0/4] Add RZ/G3L PCIe support

[PATCH 0/4] Add RZ/G3L PCIe support

[Biju]

From: Biju Das <biju.das.jz@bp.renesas.com>

Hi All,

The RZ/G3L PCIe controller is similar to RZ/G3S but has
some key differences:
     - Has 3 clocks compared to 2 on other SoCs.
     - Has a different set of reset signals
Add support for RZ/G3L PCIe.

Patch 3 apply on top of [1] and [2]
[1] https://lore.kernel.org/all/20260811200013.185956-1-prabhakar.mahadev-lad.rj@bp.renesas.com/
[2] https://lore.kernel.org/linux-renesas-soc/20260814141312.2947972-1-claudiu.beznea+renesas@tuxon.dev/

Biju Das (4):
  dt-bindings: PCI: renesas,r9a08g045s33-pcie: Document RZ/G3L SoC
  clk: renesas: r9a08g046: Add PCIe clocks and reset
  PCI: rzg3s-host: Add support for RZ/G3L SoC
  arm64: dts: renesas: r9a08g046: Add PCIe support

 .../bindings/pci/renesas,r9a08g045-pcie.yaml  | 33 +++++++++++++-
 arch/arm64/boot/dts/renesas/r9a08g046.dtsi    | 45 ++++++++++++++++++-
 .../boot/dts/renesas/r9a08g046l48-smarc.dts   | 16 +++++++
 .../boot/dts/renesas/rzg3l-smarc-som.dtsi     | 11 +++++
 drivers/clk/renesas/r9a08g046-cpg.c           |  9 ++++
 drivers/pci/controller/pcie-rzg3s-host.c      | 25 ++++++++++-
 6 files changed, 135 insertions(+), 4 deletions(-)

-- 
2.43.0

[PATCH 1/4] dt-bindings: PCI: renesas,r9a08g045s33-pcie: Document RZ/G3L SoC

[Biju]

From: Biju Das <biju.das.jz@bp.renesas.com>

Extend the existing device tree bindings for Renesas RZ/G3S PCIe
controller to include support for the RZ/G3L (renesas,r9a08g046-pcie)
PCIe controller. The RZ/G3L PCIe controller is similar to RZ/G3S but has
some key differences:
     - Has 3 clocks compared to 2 on other SoCs.
     - Has a different set of reset signals

Add device tree bindings for renesas,r9a08g046-pcie compatible IPs.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
 .../bindings/pci/renesas,r9a08g045-pcie.yaml  | 33 ++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml b/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml
index 09d78bd1a577..911b1976bf53 100644
--- a/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml
@@ -13,7 +13,7 @@ description: |
   PCIe host controller found in Renesas RZ/G3S and similar SoCs complies
   with PCIe Base Specification 4.0 and supports different link speeds
   depending on the SoC variant:
-    - Gen2 (5 GT/s): RZ/G3S
+    - Gen2 (5 GT/s): RZ/G3{L,S}
     - Gen3 (8 GT/s): RZ/G3E, RZ/V2H(P), RZ/V2N
 
 properties:
@@ -21,6 +21,7 @@ properties:
     oneOf:
       - enum:
           - renesas,r9a08g045-pcie # RZ/G3S
+          - renesas,r9a08g046-pcie # RZ/G3L
           - renesas,r9a09g047-pcie # RZ/G3E
           - renesas,r9a09g057-pcie # RZ/V2H(P)
       - items:
@@ -87,14 +88,18 @@ properties:
   interrupt-controller: true
 
   clocks:
+    minItems: 2
     items:
       - description: System clock
       - description: PM control clock or clock for L1 substate handling
+      - description: PM control clock or clock for L1 substate handling
 
   clock-names:
+    minItems: 2
     items:
       - const: aclk
       - enum: [pm, pmu]
+      - enum: [pm, pmu]
 
   resets:
     minItems: 1
@@ -215,6 +220,8 @@ allOf:
           maxItems: 16
         interrupt-names:
           maxItems: 16
+        clocks:
+          maxItems: 2
         clock-names:
           items:
             - const: aclk
@@ -223,6 +230,28 @@ allOf:
           minItems: 7
         reset-names:
           minItems: 7
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a08g046-pcie
+    then:
+      properties:
+        interrupts:
+          maxItems: 16
+        interrupt-names:
+          maxItems: 16
+        clocks:
+          minItems: 3
+        clock-names:
+          items:
+            - const: aclk
+            - const: pm
+            - const: pmu
+        resets:
+          maxItems: 1
+        reset-names:
+          maxItems: 1
   - if:
       properties:
         compatible:
@@ -236,6 +265,8 @@ allOf:
           minItems: 23
         interrupt-names:
           minItems: 23
+        clocks:
+          maxItems: 2
         clock-names:
           items:
             - const: aclk
-- 
2.43.0

Re: [PATCH 1/4] dt-bindings: PCI: renesas,r9a08g045s33-pcie: Document RZ/G3L SoC

[Krzysztof Kozlowski]

On Tue, Aug 25, 2026 at 10:50:40AM +0100, Biju wrote:
> From: Biju Das <biju.das.jz@bp.renesas.com>
> 
> Extend the existing device tree bindings for Renesas RZ/G3S PCIe
> controller to include support for the RZ/G3L (renesas,r9a08g046-pcie)
> PCIe controller. The RZ/G3L PCIe controller is similar to RZ/G3S but has
> some key differences:
>      - Has 3 clocks compared to 2 on other SoCs.
>      - Has a different set of reset signals
> 
> Add device tree bindings for renesas,r9a08g046-pcie compatible IPs.
> 
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> ---
>  .../bindings/pci/renesas,r9a08g045-pcie.yaml  | 33 ++++++++++++++++++-
>  1 file changed, 32 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml b/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml
> index 09d78bd1a577..911b1976bf53 100644
> --- a/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml
> +++ b/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml
> @@ -13,7 +13,7 @@ description: |
>    PCIe host controller found in Renesas RZ/G3S and similar SoCs complies
>    with PCIe Base Specification 4.0 and supports different link speeds
>    depending on the SoC variant:
> -    - Gen2 (5 GT/s): RZ/G3S
> +    - Gen2 (5 GT/s): RZ/G3{L,S}
>      - Gen3 (8 GT/s): RZ/G3E, RZ/V2H(P), RZ/V2N
>  
>  properties:
> @@ -21,6 +21,7 @@ properties:
>      oneOf:
>        - enum:
>            - renesas,r9a08g045-pcie # RZ/G3S
> +          - renesas,r9a08g046-pcie # RZ/G3L
>            - renesas,r9a09g047-pcie # RZ/G3E
>            - renesas,r9a09g057-pcie # RZ/V2H(P)
>        - items:
> @@ -87,14 +88,18 @@ properties:
>    interrupt-controller: true
>  
>    clocks:
> +    minItems: 2
>      items:
>        - description: System clock
>        - description: PM control clock or clock for L1 substate handling
> +      - description: PM control clock or clock for L1 substate handling

PMU? You list both clocks, but is there any different between them?

>  
>    clock-names:
> +    minItems: 2
>      items:
>        - const: aclk
>        - enum: [pm, pmu]
> +      - enum: [pm, pmu]

This should be "const: pmu" in such case.

Best regards,
Krzysztof

RE: [PATCH 1/4] dt-bindings: PCI: renesas,r9a08g045s33-pcie: Document RZ/G3L SoC

[Biju Das]

Hi Krzysztof Kozlowski/Geert,

Thanks for the feedback.

> -----Original Message-----
> From: Krzysztof Kozlowski <krzk@kernel.org>
> Sent: 31 August 2026 07:34
> Subject: Re: [PATCH 1/4] dt-bindings: PCI: renesas,r9a08g045s33-pcie: Document RZ/G3L SoC
> 
> On Tue, Aug 25, 2026 at 10:50:40AM +0100, Biju wrote:
> > From: Biju Das <biju.das.jz@bp.renesas.com>
> >
> > Extend the existing device tree bindings for Renesas RZ/G3S PCIe
> > controller to include support for the RZ/G3L (renesas,r9a08g046-pcie)
> > PCIe controller. The RZ/G3L PCIe controller is similar to RZ/G3S but
> > has some key differences:
> >      - Has 3 clocks compared to 2 on other SoCs.
> >      - Has a different set of reset signals
> >
> > Add device tree bindings for renesas,r9a08g046-pcie compatible IPs.
> >
> > Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> > ---
> >  .../bindings/pci/renesas,r9a08g045-pcie.yaml  | 33
> > ++++++++++++++++++-
> >  1 file changed, 32 insertions(+), 1 deletion(-)
> >
> > diff --git
> > a/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml
> > b/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml
> > index 09d78bd1a577..911b1976bf53 100644
> > ---
> > a/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml
> > +++ b/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yam
> > +++ l
> > @@ -13,7 +13,7 @@ description: |
> >    PCIe host controller found in Renesas RZ/G3S and similar SoCs complies
> >    with PCIe Base Specification 4.0 and supports different link speeds
> >    depending on the SoC variant:
> > -    - Gen2 (5 GT/s): RZ/G3S
> > +    - Gen2 (5 GT/s): RZ/G3{L,S}
> >      - Gen3 (8 GT/s): RZ/G3E, RZ/V2H(P), RZ/V2N
> >
> >  properties:
> > @@ -21,6 +21,7 @@ properties:
> >      oneOf:
> >        - enum:
> >            - renesas,r9a08g045-pcie # RZ/G3S
> > +          - renesas,r9a08g046-pcie # RZ/G3L
> >            - renesas,r9a09g047-pcie # RZ/G3E
> >            - renesas,r9a09g057-pcie # RZ/V2H(P)
> >        - items:
> > @@ -87,14 +88,18 @@ properties:
> >    interrupt-controller: true
> >
> >    clocks:
> > +    minItems: 2
> >      items:
> >        - description: System clock
> >        - description: PM control clock or clock for L1 substate
> > handling
> > +      - description: PM control clock or clock for L1 substate
> > + handling
> 
> PMU? You list both clocks, but is there any different between them?

OK will drop the or part.

> 
> >
> >    clock-names:
> > +    minItems: 2
> >      items:
> >        - const: aclk
> >        - enum: [pm, pmu]
> > +      - enum: [pm, pmu]
> 
> This should be "const: pmu" in such case.

Agreed.

Cheers,
Biju

Re: [PATCH 1/4] dt-bindings: PCI: renesas,r9a08g045s33-pcie: Document RZ/G3L SoC

[Geert Uytterhoeven]

Hi Biju,

On Tue, 25 Aug 2026 at 11:50, Biju <biju.das.au@gmail.com> wrote:
> From: Biju Das <biju.das.jz@bp.renesas.com>
>
> Extend the existing device tree bindings for Renesas RZ/G3S PCIe
> controller to include support for the RZ/G3L (renesas,r9a08g046-pcie)
> PCIe controller. The RZ/G3L PCIe controller is similar to RZ/G3S but has
> some key differences:
>      - Has 3 clocks compared to 2 on other SoCs.
>      - Has a different set of reset signals
>
> Add device tree bindings for renesas,r9a08g046-pcie compatible IPs.
>
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>

Thanks for your patch!

> --- a/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml
> +++ b/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml

> @@ -87,14 +88,18 @@ properties:
>    interrupt-controller: true
>
>    clocks:
> +    minItems: 2
>      items:
>        - description: System clock
>        - description: PM control clock or clock for L1 substate handling
> +      - description: PM control clock or clock for L1 substate handling

As pointed out by Krzysztof, the "or ..." part should be dropped...

>
>    clock-names:
> +    minItems: 2
>      items:
>        - const: aclk
>        - enum: [pm, pmu]
> +      - enum: [pm, pmu]

... this can only be "pmu".

>
>    resets:
>      minItems: 1

The rest LGTM.

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 4/4] arm64: dts: renesas: r9a08g046: Add PCIe support

[Biju]

From: Biju Das <biju.das.jz@bp.renesas.com>

Populate the previously placeholder PCIe node for the RZ/G3L
(R9A08G046) SoC with interrupts, clocks, resets, interrupt-map, and
the PCIe root port's vendor/device ID, and enable it on the RZ/G3L
SMARC board with the required pin control, CLKREQ# GPIO hog, and
100 MHz reference clock.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
 arch/arm64/boot/dts/renesas/r9a08g046.dtsi    | 45 ++++++++++++++++++-
 .../boot/dts/renesas/r9a08g046l48-smarc.dts   | 16 +++++++
 .../boot/dts/renesas/rzg3l-smarc-som.dtsi     | 11 +++++
 3 files changed, 70 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/renesas/r9a08g046.dtsi b/arch/arm64/boot/dts/renesas/r9a08g046.dtsi
index f652ad3f1d1a..83e466ec49ff 100644
--- a/arch/arm64/boot/dts/renesas/r9a08g046.dtsi
+++ b/arch/arm64/boot/dts/renesas/r9a08g046.dtsi
@@ -1480,20 +1480,61 @@ hsusb1: usb@11eb0000 {
 		};
 
 		pcie: pcie@11e40000 {
+			compatible = "renesas,r9a08g046-pcie";
 			reg = <0 0x11e40000 0 0x10000>;
 			ranges = <0x02000000 0 0x30000000 0 0x30000000 0 0x08000000>;
+			/* Map all possible DRAM ranges (4 GB). */
+			dma-ranges = <0x42000000 0 0x40000000 0 0x40000000 1 0x00000000>;
+			bus-range = <0x0 0xff>;
+			interrupts = <GIC_SPI 483 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 484 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 485 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 486 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 487 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 488 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 489 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 490 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 491 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 492 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 493 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 494 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 495 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 496 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 497 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 498 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "serr", "serr_cor", "serr_nonfatal",
+					  "serr_fatal", "axi_err", "inta",
+					  "intb", "intc", "intd", "msi",
+					  "link_bandwidth", "pm_pme", "dma",
+					  "pcie_evt", "msg", "all";
+			#interrupt-cells = <1>;
+			interrupt-controller;
+			interrupt-map-mask = <0 0 0 7>;
+			interrupt-map = <0 0 0 1 &pcie 0 0 0 0>, /* INTA */
+					<0 0 0 2 &pcie 0 0 0 1>, /* INTB */
+					<0 0 0 3 &pcie 0 0 0 2>, /* INTC */
+					<0 0 0 4 &pcie 0 0 0 3>; /* INTD */
+			clocks = <&cpg CPG_MOD R9A08G046_PCI_ACLK>,
+				 <&cpg CPG_MOD R9A08G046_PCI_CLKL1PM>,
+				 <&cpg CPG_MOD R9A08G046_PCI_CLK_PMU>;
+			clock-names = "aclk", "pm", "pmu";
+			resets = <&cpg R9A08G046_PCI_ARESETN>;
+			reset-names = "aresetn";
+			power-domains = <&cpg>;
 			device_type = "pci";
 			#address-cells = <3>;
 			#size-cells = <2>;
-			/* placeholder */
+			renesas,sysc = <&sysc>;
+			status = "disabled";
 
 			pcie_port0: pcie@0,0 {
 				reg = <0x0 0x0 0x0 0x0 0x0>;
 				ranges;
 				device_type = "pci";
+				vendor-id = <0x1912>;
+				device-id = <0x0033>;
 				#address-cells = <3>;
 				#size-cells = <2>;
-				/* placeholder */
 			};
 		};
 
diff --git a/arch/arm64/boot/dts/renesas/r9a08g046l48-smarc.dts b/arch/arm64/boot/dts/renesas/r9a08g046l48-smarc.dts
index 5a8269c06435..a155967e1f68 100644
--- a/arch/arm64/boot/dts/renesas/r9a08g046l48-smarc.dts
+++ b/arch/arm64/boot/dts/renesas/r9a08g046l48-smarc.dts
@@ -170,6 +170,11 @@ &ohci1 {
 	status = "okay";
 };
 
+&pcie {
+	pinctrl-0 = <&pcie_pins>;
+	pinctrl-names = "default";
+};
+
 &phyrst {
 	status = "okay";
 };
@@ -190,6 +195,17 @@ i2c3_pins: i2c3 {
 			 <RZG3L_PORT_PINMUX(2, 1, 4)>; /* RIIC3_SDA */
 	};
 
+	pcie-clkreq-n-hog {
+		gpio-hog;
+		gpios = <RZG3L_GPIO(G, 6) GPIO_ACTIVE_HIGH>;
+		output-low;
+		line-name = "PCIE_A_CKREQ";
+	};
+
+	pcie_pins: pcie {
+		pinmux = <RZG3L_PORT_PINMUX(G, 7, 1)>; /* PCIE_RST_OUT# */
+	};
+
 	rsci1_pins: rsci1 {
 		pinmux = <RZG3L_PORT_PINMUX(D, 4, 5)>, /* RSCI1_RXD_MISO_SCL */
 			 <RZG3L_PORT_PINMUX(D, 5, 5)>, /* RSCI1_TXD_MOSI_SDA */
diff --git a/arch/arm64/boot/dts/renesas/rzg3l-smarc-som.dtsi b/arch/arm64/boot/dts/renesas/rzg3l-smarc-som.dtsi
index c1c2795bda4e..2ee11d54bd58 100644
--- a/arch/arm64/boot/dts/renesas/rzg3l-smarc-som.dtsi
+++ b/arch/arm64/boot/dts/renesas/rzg3l-smarc-som.dtsi
@@ -51,6 +51,12 @@ memory@48000000 {
 		reg = <0x0 0x48000000 0x0 0x78000000>;
 	};
 
+	pcie_refclk: pcie-ref-clock {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <100000000>;
+	};
+
 	reg_1p0v: regulator-1p0v {
 		compatible = "regulator-fixed";
 		regulator-name = "fixed-1.0V";
@@ -190,6 +196,11 @@ phy1: ethernet-phy@7 {
 	};
 };
 
+&pcie_port0 {
+	clocks = <&pcie_refclk>;
+	clock-names = "ref";
+};
+
 &pinctrl {
 	eth0_pins: eth0 {
 		txc {
-- 
2.43.0

Re: [PATCH 4/4] arm64: dts: renesas: r9a08g046: Add PCIe support

[Geert Uytterhoeven]

On Tue, 25 Aug 2026 at 11:50, Biju <biju.das.au@gmail.com> wrote:
> From: Biju Das <biju.das.jz@bp.renesas.com>
>
> Populate the previously placeholder PCIe node for the RZ/G3L
> (R9A08G046) SoC with interrupts, clocks, resets, interrupt-map, and
> the PCIe root port's vendor/device ID, and enable it on the RZ/G3L
> SMARC board with the required pin control, CLKREQ# GPIO hog, and
> 100 MHz reference clock.
>
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
i.e. will queue in renesas-devel for v7.4, pending acceptance of the
DT bindings.

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