linux-kernel - [PATCH v4 3/3] riscv: dts: spacemit: define a SPI controller node

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Message-ID: <20250925121714.2514932-4-elder@riscstar.com>
Date: Thu, 25 Sep 2025 07:17:13 -0500
From: Alex Elder <elder@...cstar.com>
To: broonie@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org
Cc: dlan@...too.org,
	ziyao@...root.org,
	junhui.liu@...moral.tech,
	linux-spi@...r.kernel.org,
	devicetree@...r.kernel.org,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	alex@...ti.fr,
	p.zabel@...gutronix.de,
	spacemit@...ts.linux.dev,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 3/3] riscv: dts: spacemit: define a SPI controller node

Define a node for the fourth SoC SPI controller (number 3) on
the SpacemiT K1 SoC.

Enable it on the Banana Pi BPI-F3 board, which exposes this feature
via its GPIO block:
  GPIO PIN 19:  MOSI
  GPIO PIN 21:  MISO
  GPIO PIN 23:  SCLK
  GPIO PIN 24:  SS (inverted)

Define pincontrol configurations for the pins as used on that board.

(This was tested using a GigaDevice GD25Q64E SPI NOR chip.)

Signed-off-by: Alex Elder <elder@...cstar.com>
---
v4: - Formatted dmas and dma-names properties on one line
    - Renamed a pinctrl node

 .../boot/dts/spacemit/k1-bananapi-f3.dts      |  7 +++++++
 arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi  | 20 +++++++++++++++++++
 arch/riscv/boot/dts/spacemit/k1.dtsi          | 15 ++++++++++++++
 3 files changed, 42 insertions(+)

diff --git a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
index 2aaaff77831e1..d9d865fbe320e 100644
--- a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
+++ b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
@@ -14,6 +14,7 @@ aliases {
 		ethernet0 = &eth0;
 		ethernet1 = &eth1;
 		serial0 = &uart0;
+		spi3 = &spi3;
 	};
 
 	chosen {
@@ -92,6 +93,12 @@ &pdma {
 	status = "okay";
 };
 
+&spi3 {
+	pinctrl-0 = <&ssp3_0_cfg>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
 &uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart0_2_cfg>;
diff --git a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
index aff19c86d5ff3..6ce56584ff473 100644
--- a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
@@ -76,4 +76,24 @@ pwm14-1-pins {
 			drive-strength = <32>;
 		};
 	};
+
+	ssp3_0_cfg: ssp3-0-cfg {
+		ssp3-0-pins {
+			pinmux = <K1_PADCONF(75, 2)>,	/* SCLK */
+				 <K1_PADCONF(77, 2)>,	/* MOSI  */
+				 <K1_PADCONF(78, 2)>;	/* MISO */
+
+			bias-disable;
+			drive-strength = <19>;
+			power-source = <3300>;
+		};
+
+		ssp3-0-frm-pins {
+			pinmux = <K1_PADCONF(76, 2)>;	/* FRM (frame) */
+
+			bias-pull-up = <0>;
+			drive-strength = <19>;
+			power-source = <3300>;
+		};
+	};
 };
diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi b/arch/riscv/boot/dts/spacemit/k1.dtsi
index 6cdcd80a7c83b..ce55897d34fac 100644
--- a/arch/riscv/boot/dts/spacemit/k1.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1.dtsi
@@ -797,6 +797,21 @@ uart9: serial@...17800 {
 				status = "disabled";
 			};
 
+			spi3: spi@...1c000 {
+				compatible = "spacemit,k1-spi";
+				reg = <0x0 0xd401c000 0x0 0x30>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+				clocks = <&syscon_apbc CLK_SSP3>,
+					 <&syscon_apbc CLK_SSP3_BUS>;
+				clock-names = "core", "bus";
+				resets = <&syscon_apbc RESET_SSP3>;
+				interrupts = <55>;
+				dmas = <&pdma 20>, <&pdma 19>;
+				dma-names = "rx", "tx";
+				status = "disabled";
+			};
+
 			/* sec_uart1: 0xf0612000, not available from Linux */
 		};
 
-- 
2.48.1