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Date: Sun, 28 Aug 2022 15:33:26 +0200
From: Dario Binacchi <dario.binacchi@...rulasolutions.com>
To: linux-kernel@...r.kernel.org
Cc: Marc Kleine-Budde <mkl@...gutronix.de>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
michael@...rulasolutions.com,
Amarula patchwork <linux-amarula@...rulasolutions.com>,
Vincent Mailhol <mailhol.vincent@...adoo.fr>,
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
Rob Herring <robh@...nel.org>,
Dario Binacchi <dario.binacchi@...rulasolutions.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Paolo Abeni <pabeni@...hat.com>,
Rob Herring <robh+dt@...nel.org>,
Wolfgang Grandegger <wg@...ndegger.com>,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-can@...r.kernel.org,
linux-stm32@...md-mailman.stormreply.com, netdev@...r.kernel.org
Subject: [RFC PATCH v3 1/4] dt-bindings: net: can: add STM32 bxcan DT bindings
Add documentation of device tree bindings for the STM32 basic extended
CAN (bxcan) controller.
Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
---
Changes in v3:
- Remove 'Dario Binacchi <dariobin@...ero.it>' SOB.
- Add description to the parent of the two child nodes.
- Move "patterProperties:" after "properties: in top level before "required".
- Add "clocks" to the "required:" list of the child nodes.
Changes in v2:
- Change the file name into 'st,stm32-bxcan-core.yaml'.
- Rename compatibles:
- st,stm32-bxcan-core -> st,stm32f4-bxcan-core
- st,stm32-bxcan -> st,stm32f4-bxcan
- Rename master property to st,can-master.
- Remove the status property from the example.
- Put the node child properties as required.
.../bindings/net/can/st,stm32-bxcan.yaml | 142 ++++++++++++++++++
1 file changed, 142 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
diff --git a/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
new file mode 100644
index 000000000000..3278c724e6f5
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
@@ -0,0 +1,142 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/can/st,stm32-bxcan.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectronics bxCAN controller
+
+description: STMicroelectronics BxCAN controller for CAN bus
+
+maintainers:
+ - Dario Binacchi <dario.binacchi@...rulasolutions.com>
+
+allOf:
+ - $ref: can-controller.yaml#
+
+properties:
+ compatible:
+ description:
+ It manages the access to the 512-bytes SRAM memory shared by the
+ two bxCAN cells (CAN1 master and CAN2 slave) in dual CAN peripheral
+ configuration.
+ enum:
+ - st,stm32f4-bxcan-core
+
+ reg:
+ maxItems: 1
+
+ resets:
+ maxItems: 1
+
+ clocks:
+ description:
+ Input clock for registers access
+ maxItems: 1
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+patternProperties:
+ "^can@[0-9]+$":
+ type: object
+ description:
+ A CAN block node contains two subnodes, representing each one a CAN
+ instance available on the machine.
+
+ properties:
+ compatible:
+ enum:
+ - st,stm32f4-bxcan
+
+ st,can-master:
+ description:
+ Master and slave mode of the bxCAN peripheral is only relevant
+ if the chip has two CAN peripherals. In that case they share
+ some of the required logic, and that means you cannot use the
+ slave CAN without the master CAN.
+ type: boolean
+
+ reg:
+ description: |
+ Offset of CAN instance in CAN block. Valid values are:
+ - 0x0: CAN1
+ - 0x400: CAN2
+ maxItems: 1
+
+ interrupts:
+ items:
+ - description: transmit interrupt
+ - description: FIFO 0 receive interrupt
+ - description: FIFO 1 receive interrupt
+ - description: status change error interrupt
+
+ interrupt-names:
+ items:
+ - const: tx
+ - const: rx0
+ - const: rx1
+ - const: sce
+
+ resets:
+ maxItems: 1
+
+ clocks:
+ description:
+ Input clock for registers access
+ maxItems: 1
+
+ additionalProperties: false
+
+ required:
+ - compatible
+ - reg
+ - interrupts
+ - resets
+ - clocks
+
+required:
+ - compatible
+ - reg
+ - resets
+ - clocks
+ - '#address-cells'
+ - '#size-cells'
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/clock/stm32fx-clock.h>
+ #include <dt-bindings/mfd/stm32f4-rcc.h>
+
+ can: can@...06400 {
+ compatible = "st,stm32f4-bxcan-core";
+ reg = <0x40006400 0x800>;
+ resets = <&rcc STM32F4_APB1_RESET(CAN1)>;
+ clocks = <&rcc 0 STM32F4_APB1_CLOCK(CAN1)>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ can1: can@0 {
+ compatible = "st,stm32f4-bxcan";
+ reg = <0x0>;
+ interrupts = <19>, <20>, <21>, <22>;
+ interrupt-names = "tx", "rx0", "rx1", "sce";
+ resets = <&rcc STM32F4_APB1_RESET(CAN1)>;
+ clocks = <&rcc 0 STM32F4_APB1_CLOCK(CAN1)>;
+ st,can-master;
+ };
+
+ can2: can@400 {
+ compatible = "st,stm32f4-bxcan";
+ reg = <0x400>;
+ interrupts = <63>, <64>, <65>, <66>;
+ interrupt-names = "tx", "rx0", "rx1", "sce";
+ resets = <&rcc STM32F4_APB1_RESET(CAN2)>;
+ clocks = <&rcc 0 STM32F4_APB1_CLOCK(CAN2)>;
+ };
+ };
--
2.32.0
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