[PATCH v4 1/3] dt-bindings: spi: add SpacemiT K1 SPI support

Alex Elder
2025-09-25T12:09:27Z

Add support for the SPI controller implemented by the SpacemiT K1 SoC.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Alex Elder <elder@riscstar.com>
---
v4: - Formatted dmas and dma-names properties on one line in example

.../bindings/spi/spacemit,k1-spi.yaml | 84 +++++++++++++++++++
1 file changed, 84 insertions(+)
create mode 100644 Documentation/devicetree/bindings/spi/spacemit,k1-spi.yaml

diff --git a/Documentation/devicetree/bindings/spi/spacemit,k1-spi.yaml b/Documentation/devicetree/bindings/spi/spacemit,k1-spi.yaml
new file mode 100644
index 0000000000000..e82c7f8d0b981
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spacemit,k1-spi.yaml
@@ -0,0 +1,84 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/spacemit,k1-spi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SpacemiT K1 SoC Serial Peripheral Interface (SPI)
+
+maintainers:
+ - Alex Elder <elder@kernel.org>
+
+description:
+ The SpacemiT K1 SoC implements a SPI controller that has two 32-entry
+ FIFOs, for transmit and receive. Details are currently available in
+ section 18.2.1 of the K1 User Manual, found in the SpacemiT Keystone
+ K1 Documentation[1]. The controller transfers words using PIO. DMA
+ transfers are supported as well, if both TX and RX DMA channels are
+ specified,
+
+ [1] https://developer.spacemit.com/documentation
+
+allOf:
+ - $ref: /schemas/spi/spi-controller.yaml#
+
+properties:
+ compatible:
+ const: spacemit,k1-spi
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ items:
+ - description: Core clock
+ - description: Bus clock
+
+ clock-names:
+ items:
+ - const: core
+ - const: bus
+
+ resets:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ dmas:
+ items:
+ - description: RX DMA channel
+ - description: TX DMA channel
+
+ dma-names:
+ items:
+ - const: rx
+ - const: tx
+
+required:
+ - compatible
+ - reg
+ - clocks
+ - clock-names
+ - resets
+ - interrupts
+
+unevaluatedProperties: false
+
+examples:
+ - |
+
+ #include <dt-bindings/clock/spacemit,k1-syscon.h>
+ spi@d401c000 {
+ compatible = "spacemit,k1-spi";
+ reg = <0xd401c000 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";
+ };