[PATCH v2] arm64: dts: broadcom: bcm2712-rpi-5-b: add spi0 interface

[Gregor Herburger <gregor.herburger@linutronix.de>]

The Raspberry Pi 5 routes the spi0 of the rp1 chip to the pin header.
Add the rp1_spi0 node and its pinctrl node to the devicetree to enable
the spi interface.

Signed-off-by: Gregor Herburger <gregor.herburger@linutronix.de>
---
The RP1 chip, found on the raspberry Pi 5, has nine spi controllers. The
spi0 is routed to the pin header. Add the rp1 nodes and enable it for
the Raspberry Pi 5.
---
Changes in v2:
- Drop first patch as it got already applied: https://lore.kernel.org/lkml/20260903194624.2038562-1-florian.fainelli@broadcom.com/
- add cs gpios to rp1_gpio for pinctrl
- Link to v1: https://patch.msgid.link/20260811-bcm2712-spi-v1-0-4c1708d354bb@linutronix.de
---
 arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
index 0fc57e72632ed..0de3d78100a5d 100644
--- a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
+++ b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
@@ -69,6 +69,20 @@ usb_vbus_default_state: usb-vbus-default-state {
 		groups = "vbus1";
 	};
 
+	rp1_spi0_default_state: rp1-spi0-default-state {
+		function = "spi0";
+		groups = "spi0";
+		bias-disable;
+		drive-strength = <12>;
+		slew-rate = <1>;
+	};
+
+	rp1_spi0_cs_default_state: rp1-spi0-cs-default-state {
+		function = "gpio";
+		pins = "gpio7", "gpio8";
+		bias-pull-up;
+	};
+
 	rp1_i2c4_default_state: rp1-i2c4-default-state {
 		function = "i2c4";
 		groups = "i2c4_2";
@@ -94,6 +108,14 @@ &rp1_i2c6 {
 	pinctrl-names = "default";
 };
 
+&rp1_spi0 {
+	pinctrl-0 = <&rp1_spi0_default_state &rp1_spi0_cs_default_state>;
+	pinctrl-names = "default";
+
+	num-cs = <2>;
+	cs-gpios = <&rp1_gpio 8 GPIO_ACTIVE_LOW &rp1_gpio 7 GPIO_ACTIVE_LOW>;
+};
+
 &rp1_usb0 {
 	pinctrl-0 = <&usb_vbus_default_state>;
 	pinctrl-names = "default";

---
base-commit: db2ddb87143519e20a95aa36c60b36107b736a58
change-id: 20260811-bcm2712-spi-644b70fee3bf

Best regards,
--  
Gregor Herburger <gregor.herburger@linutronix.de>