linux-kernel - [PATCH v9 3/5] ARM: dts: stm32: add CAN support on stm32f429

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Date:   Mon, 27 Mar 2023 22:16:28 +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>,
        Rob Herring <robh@...nel.org>,
        Amarula patchwork <linux-amarula@...rulasolutions.com>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        michael@...rulasolutions.com,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Dario Binacchi <dario.binacchi@...rulasolutions.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: [PATCH v9 3/5] ARM: dts: stm32: add CAN support on stm32f429

Add support for bxcan (Basic eXtended CAN controller) to STM32F429. The
chip contains two CAN peripherals, CAN1 the primary and CAN2 the secondary,
that share some of the required logic like clock and filters. This means
that the secondary CAN can't be used without the primary CAN.

Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>

---

Changes in v9:
- Replace master/slave terms with primary/secondary.

Changes in v6:
- move can1 node before gcan to keep ordering by address.

Changes in v4:
- Replace the node can@...06400 (compatible "st,stm32f4-bxcan-core")
  with the gcan@...06600 node ("sysnode" compatible). The gcan node
  contains clocks and memory addresses shared by the two can nodes
  of which it's no longer the parent.
- Add to can nodes the "st,gcan" property (global can memory) which
  references the gcan@...06600 node ("sysnode compatibble).

Changes in v3:
- Remove 'Dario Binacchi <dariobin@...ero.it>' SOB.
- Add "clocks" to can@0 node.

 arch/arm/boot/dts/stm32f429.dtsi | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/arch/arm/boot/dts/stm32f429.dtsi b/arch/arm/boot/dts/stm32f429.dtsi
index c31ceb821231..c9e05e3540d6 100644
--- a/arch/arm/boot/dts/stm32f429.dtsi
+++ b/arch/arm/boot/dts/stm32f429.dtsi
@@ -362,6 +362,35 @@ i2c3: i2c@...05c00 {
 			status = "disabled";
 		};
 
+		can1: can@...06400 {
+			compatible = "st,stm32f4-bxcan";
+			reg = <0x40006400 0x200>;
+			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-primary;
+			st,gcan = <&gcan>;
+			status = "disabled";
+		};
+
+		gcan: gcan@...06600 {
+			compatible = "st,stm32f4-gcan", "syscon";
+			reg = <0x40006600 0x200>;
+			clocks = <&rcc 0 STM32F4_APB1_CLOCK(CAN1)>;
+		};
+
+		can2: can@...06800 {
+			compatible = "st,stm32f4-bxcan";
+			reg = <0x40006800 0x200>;
+			interrupts = <63>, <64>, <65>, <66>;
+			interrupt-names = "tx", "rx0", "rx1", "sce";
+			resets = <&rcc STM32F4_APB1_RESET(CAN2)>;
+			clocks = <&rcc 0 STM32F4_APB1_CLOCK(CAN2)>;
+			st,gcan = <&gcan>;
+			status = "disabled";
+		};
+
 		dac: dac@...07400 {
 			compatible = "st,stm32f4-dac-core";
 			reg = <0x40007400 0x400>;
-- 
2.32.0