linux-kernel - [PATCH v8 2/2] dt-bindings: fpga: document Lattice sysCONFIG FPGA manager

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Message-Id: <20220825112433.14583-3-i.bornyakov@metrotek.ru>
Date:   Thu, 25 Aug 2022 14:24:33 +0300
From:   Ivan Bornyakov <i.bornyakov@...rotek.ru>
To:     mdf@...nel.org, hao.wu@...el.com, yilun.xu@...el.com,
        trix@...hat.com, dg@...ix.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 v8 2/2] dt-bindings: fpga: document Lattice sysCONFIG FPGA manager

Add Device Tree Binding doc for configuring Lattice ECP5 and MachXO2
FPGAs over Slave SPI sysCONFIG interface.

Signed-off-by: Ivan Bornyakov <i.bornyakov@...rotek.ru>
---
 .../bindings/fpga/lattice,sysconfig.yaml      | 109 ++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/fpga/lattice,sysconfig.yaml

diff --git a/Documentation/devicetree/bindings/fpga/lattice,sysconfig.yaml b/Documentation/devicetree/bindings/fpga/lattice,sysconfig.yaml
new file mode 100644
index 000000000000..3ea338a05bb5
--- /dev/null
+++ b/Documentation/devicetree/bindings/fpga/lattice,sysconfig.yaml
@@ -0,0 +1,109 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/fpga/lattice,sysconfig.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Lattice Slave SPI sysCONFIG FPGA manager
+
+maintainers:
+  - Ivan Bornyakov <i.bornyakov@...rotek.ru>
+
+description: |
+  Lattice sysCONFIG port, which is used for FPGA configuration, among others,
+  have Slave Serial Peripheral Interface. Only full reconfiguration is
+  supported.
+
+  Programming of ECP5 is done by writing uncompressed bitstream image in .bit
+  format into FPGA's SRAM configuration memory.
+
+  Programming of MachXO2 is done by writing configuration data into device's
+  internal non-volatile Flash memory, then Self-Download of data from Flash
+  into SRAM is issued.
+
+properties:
+  compatible:
+    enum:
+      - lattice,ecp5-fpga-mgr
+      - lattice,machxo2-fpga-mgr
+
+  reg:
+    maxItems: 1
+
+  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
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: lattice,machxo2-fpga-mgr
+    then:
+      properties:
+        spi-max-frequency:
+          maximum: 66000000
+        program-gpios: false
+        init-gpios: false
+        done-gpios: false
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: lattice,ecp5-fpga-mgr
+    then:
+      properties:
+        spi-max-frequency:
+          maximum: 60000000
+      required:
+        - program-gpios
+        - init-gpios
+        - done-gpios
+
+unevaluatedProperties: 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>;
+        };
+
+        fpga-mgr@1 {
+            compatible = "lattice,machxo2-fpga-mgr";
+            reg = <1>;
+            spi-max-frequency = <20000000>;
+        };
+    };
-- 
2.37.2