linux-kernel - [PATCH v4 2/2] dt-bindings: fpga: add binding doc for ecp5-spi fpga mgr

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Message-Id: <20220719092539.6748-3-i.bornyakov@metrotek.ru>
Date:   Tue, 19 Jul 2022 12:25:39 +0300
From:   Ivan Bornyakov <i.bornyakov@...rotek.ru>
To:     mdf@...nel.org, hao.wu@...el.com, yilun.xu@...el.com,
        trix@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     Ivan Bornyakov <i.bornyakov@...rotek.ru>,
        linux-fpga@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, system@...rotek.ru
Subject: [PATCH v4 2/2] dt-bindings: fpga: add binding doc for ecp5-spi fpga mgr

Add Device Tree Binding doc for Lattice ECP5 FPGA manager using slave
SPI to load .bit formatted uncompressed bitstream image.

Signed-off-by: Ivan Bornyakov <i.bornyakov@...rotek.ru>
---
 .../bindings/fpga/lattice,ecp5-fpga-mgr.yaml  | 75 +++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/fpga/lattice,ecp5-fpga-mgr.yaml

diff --git a/Documentation/devicetree/bindings/fpga/lattice,ecp5-fpga-mgr.yaml b/Documentation/devicetree/bindings/fpga/lattice,ecp5-fpga-mgr.yaml
new file mode 100644
index 000000000000..7d2bd386b533
--- /dev/null
+++ b/Documentation/devicetree/bindings/fpga/lattice,ecp5-fpga-mgr.yaml
@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/fpga/lattice,ecp5-fpga-mgr.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Lattice ECP5 Slave SPI FPGA manager.
+
+maintainers:
+  - Ivan Bornyakov <i.bornyakov@...rotek.ru>
+
+description:
+  Lattice ECP5 sysCONFIG port, which is used for device configuration, among
+  others, have Slave Serial Peripheral Interface. The driver is to program
+  Lattice ECP5 FPGA with uncompressed bitstream image in .bit format over SPI.
+  Only full reconfiguration is supported.
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml
+
+properties:
+  compatible:
+    enum:
+      - lattice,ecp5-fpga-mgr
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 60000000
+
+  program-gpios:
+    description:
+      A GPIO line connected to PROGRAMN (active low) pin of the device.
+      Initiates configuration sequence.
+    maxItems: 1
+
+  init-gpios:
+    description:
+      A GPIO line connected to INITN (active low) pin of the device.
+      Indicates that the FPGA is ready to be configured.
+    maxItems: 1
+
+  done-gpios:
+    description:
+      A GPIO line connected to DONE (active high) pin of the device.
+      Indicates that the configuration sequence is complete.
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - program-gpios
+  - init-gpios
+  - done-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        fpga-mgr@0 {
+            compatible = "lattice,ecp5-fpga-mgr";
+            reg = <0>;
+            spi-max-frequency = <20000000>;
+            program-gpios = <&gpio3 4 GPIO_ACTIVE_LOW>;
+            init-gpios = <&gpio3 3 GPIO_ACTIVE_LOW>;
+            done-gpios = <&gpio3 2 GPIO_ACTIVE_HIGH>;
+        };
+    };
-- 
2.37.1