linux-kernel - [PATCH 2/3] dt-bindings: fpga: Add Efinix serial SPI programming bindings

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Message-Id: <20240927141445.157234-2-iansdannapel@gmail.com>
Date: Fri, 27 Sep 2024 16:14:43 +0200
From: iansdannapel@...il.com
To: mdf@...nel.org,
	hao.wu@...el.com,
	yilun.xu@...el.com,
	trix@...hat.com,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	neil.armstrong@...aro.org,
	heiko.stuebner@...rry.de,
	rafal@...ecki.pl,
	linus.walleij@...aro.org,
	iansdannapel@...il.com,
	linux-fpga@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] dt-bindings: fpga: Add Efinix serial SPI programming bindings

From: Ian Dannapel <iansdannapel@...il.com>

Add device tree binding documentation for configuring Efinix FPGA
using serial SPI passive programming mode.

Signed-off-by: Ian Dannapel <iansdannapel@...il.com>
---
 .../fpga/efinix,trion-spi-passive.yaml        | 85 +++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/fpga/efinix,trion-spi-passive.yaml

diff --git a/Documentation/devicetree/bindings/fpga/efinix,trion-spi-passive.yaml b/Documentation/devicetree/bindings/fpga/efinix,trion-spi-passive.yaml
new file mode 100644
index 000000000000..ec6697fa6f44
--- /dev/null
+++ b/Documentation/devicetree/bindings/fpga/efinix,trion-spi-passive.yaml
@@ -0,0 +1,85 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/fpga/efinix,trion-spi-passive.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Efinix SPI FPGA Manager
+
+maintainers:
+  - Ian Dannapel <iansdannapel@...il.com>
+
+description: |
+  Efinix Trion and Titanium Series FPGAs support a method of loading the
+  bitstream over what is referred to as "SPI Passive Programming".
+  Only serial (1x bus width) is supported, setting the programming mode
+  is not in the scope the this manager and must be done elsewhere.
+
+  Warning: The slave serial link is not technically SPI and therefore it is
+  not recommended to have other devices on the same bus since it might
+  interfere or be interfered by other transmissions.
+
+  References:
+  - https://www.efinixinc.com/docs/an033-configuring-titanium-fpgas-v2.6.pdf
+  - https://www.efinixinc.com/docs/an006-configuring-trion-fpgas-v6.0.pdf
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    enum:
+      - efinix,trion-spi-passive
+      - efinix,titanium-spi-passive
+
+  spi-cpha: true
+
+  spi-cpol: true
+
+  spi-max-frequency:
+    maximum: 25000000
+
+  reg:
+    maxItems: 1
+
+  creset-gpios:
+    description:
+      reset and re-configuration trigger pin (low active)
+    maxItems: 1
+
+  cs-gpios:
+    description:
+      chip-select pin (low active)
+    maxItems: 1
+
+  cdone-gpios:
+    description:
+      optional configuration done status pin (high active)
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - creset-gpios
+  - cs-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      fpga-mgr@0 {
+        compatible = "efinix,trion-spi-passive";
+        reg = <0>;
+        spi-max-frequency = <25000000>;
+        spi-cpha;
+        spi-cpol;
+        creset-gpios = <&gpio4 17 GPIO_ACTIVE_LOW>;
+        cs-gpios = <&gpio5 13 GPIO_ACTIVE_LOW>;
+        cdone-gpios = <&gpio0 9 GPIO_ACTIVE_HIGH>;
+      };
+    };
+...
-- 
2.34.1