linux-kernel - [PATCH v2 3/3] riscv: dts: spacemit: define a SPI controller node

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Message-ID: <20250919155914.935608-4-elder@riscstar.com>
Date: Fri, 19 Sep 2025 10:59:13 -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,
	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 v2 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>
---
v2: - DT aliases are used rather than spacemit,k1-ssp-id for bus number
    - The order of two pin control properties was changed as requested
    - Clock names and DMA names are now on one line in the "k1.dtsi"
    - The interrupts property is used rather than interrupts-extended

 .../boot/dts/spacemit/k1-bananapi-f3.dts      |  7 +++++++
 arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi  | 20 +++++++++++++++++++
 arch/riscv/boot/dts/spacemit/k1.dtsi          | 16 +++++++++++++++
 3 files changed, 43 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..205c201a3005c 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-no-pull-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..f8c37d16968e4 100644
--- a/arch/riscv/boot/dts/spacemit/k1.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1.dtsi
@@ -856,6 +856,22 @@ storage-bus {
 			#size-cells = <2>;
 			dma-ranges = <0x0 0x00000000 0x0 0x00000000 0x0 0x80000000>;
 
+			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";
+			};
+
 			emmc: mmc@...81000 {
 				compatible = "spacemit,k1-sdhci";
 				reg = <0x0 0xd4281000 0x0 0x200>;
-- 
2.48.1