linux-kernel - [PATCH v3 3/3] arm64: dts: renesas: r8a779g3: Describe split PCIe clock on V4H Sparrow Hawk

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Message-ID: <20250607194541.79176-3-marek.vasut+renesas@mailbox.org>
Date: Sat,  7 Jun 2025 21:44:39 +0200
From: Marek Vasut <marek.vasut+renesas@...lbox.org>
To: linux-arm-kernel@...ts.infradead.org
Cc: Marek Vasut <marek.vasut+renesas@...lbox.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Conor Dooley <conor+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Rob Herring <robh@...nel.org>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org
Subject: [PATCH v3 3/3] arm64: dts: renesas: r8a779g3: Describe split PCIe clock on V4H Sparrow Hawk

The V4H Sparrow Hawk board supplies PCIe controller input clock and PCIe
bus clock from separate outputs of Renesas 9FGV0441 clock generator chip.
Describe this split bus configuration in the board DT. The topology looks
as follows:

 ____________                    _____________
| R-Car PCIe |                  | PCIe device |
|            |                  |             |
|    PCIe RX<|==================|>PCIe TX     |
|    PCIe TX<|==================|>PCIe RX     |
|            |                  |             |
|   PCIe CLK<|======..  ..======|>PCIe CLK    |
'------------'      ||  ||      '-------------'
                    ||  ||
 ____________       ||  ||
|  9FGV0441  |      ||  ||
|            |      ||  ||
|   CLK DIF0<|======''  ||
|   CLK DIF1<|==========''
|   CLK DIF2<|
|   CLK DIF3<|
'------------'

Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
Signed-off-by: Marek Vasut <marek.vasut+renesas@...lbox.org>
---
Cc: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Conor Dooley <conor+dt@...nel.org>
Cc: Geert Uytterhoeven <geert+renesas@...der.be>
Cc: Krzysztof Kozlowski <krzk+dt@...nel.org>
Cc: Magnus Damm <magnus.damm@...il.com>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Rob Herring <robh@...nel.org>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc: devicetree@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-pci@...r.kernel.org
Cc: linux-renesas-soc@...r.kernel.org
---
V2: Use pciec0_rp/pciec1_rp phandles to refer to root port moved to core r8a779g0.dtsi
V3: - Add AB from Manivannan
    - Add RB from Geert
---
 .../dts/renesas/r8a779g3-sparrow-hawk.dts     | 31 +++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk.dts b/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk.dts
index b8698e07add56..9ba23129e65ec 100644
--- a/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk.dts
+++ b/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk.dts
@@ -130,6 +130,13 @@ mini_dp_con_in: endpoint {
 		};
 	};
 
+	/* Page 26 / PCIe.0/1 CLK */
+	pcie_refclk: clk-x8 {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <25000000>;
+	};
+
 	reg_1p2v: regulator-1p2v {
 		compatible = "regulator-fixed";
 		regulator-name = "fixed-1.2V";
@@ -404,6 +411,14 @@ i2c0_mux2: i2c@2 {
 			reg = <2>;
 			#address-cells = <1>;
 			#size-cells = <0>;
+
+			/* Page 26 / PCIe.0/1 CLK */
+			pcie_clk: clk@68 {
+				compatible = "renesas,9fgv0441";
+				reg = <0x68>;
+				clocks = <&pcie_refclk>;
+				#clock-cells = <1>;
+			};
 		};
 
 		i2c0_mux3: i2c@3 {
@@ -487,26 +502,38 @@ msiof1_snd_endpoint: endpoint {
 
 /* Page 26 / 2230 Key M M.2 */
 &pcie0_clkref {
-	clock-frequency = <100000000>;
+	status = "disabled";
 };
 
 &pciec0 {
+	clocks = <&cpg CPG_MOD 624>, <&pcie_clk 0>;
 	reset-gpios = <&gpio2 2 GPIO_ACTIVE_LOW>;
 	status = "okay";
 };
 
+&pciec0_rp {
+	clocks = <&pcie_clk 1>;
+	vpcie3v3-supply = <&reg_3p3v>;
+};
+
 /* Page 25 / PCIe to USB */
 &pcie1_clkref {
-	clock-frequency = <100000000>;
+	status = "disabled";
 };
 
 &pciec1 {
+	clocks = <&cpg CPG_MOD 625>, <&pcie_clk 2>;
 	/* uPD720201 is PCIe Gen2 x1 device */
 	num-lanes = <1>;
 	reset-gpios = <&gpio2 0 GPIO_ACTIVE_LOW>;
 	status = "okay";
 };
 
+&pciec1_rp {
+	clocks = <&pcie_clk 3>;
+	vpcie3v3-supply = <&reg_3p3v>;
+};
+
 &pfc {
 	pinctrl-0 = <&scif_clk_pins>;
 	pinctrl-names = "default";
-- 
2.47.2