linux-kernel - [RFC PATCH v4 3/5] ARM: dts: stm32: add CAN support on stm32f429

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Date:   Sun, 25 Sep 2022 19:52:07 +0200
From:   Dario Binacchi <dario.binacchi@...rulasolutions.com>
To:     linux-kernel@...r.kernel.org
Cc:     Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        michael@...rulasolutions.com,
        Amarula patchwork <linux-amarula@...rulasolutions.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        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: [RFC PATCH v4 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 master and CAN2 the slave,
that share some of the required logic like clock and filters. This means
that the slave CAN can't be used without the master CAN.

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

---

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..ce08872109b8 100644
--- a/arch/arm/boot/dts/stm32f429.dtsi
+++ b/arch/arm/boot/dts/stm32f429.dtsi
@@ -362,6 +362,35 @@ i2c3: i2c@...05c00 {
 			status = "disabled";
 		};
 
+		gcan: gcan@...06600 {
+			compatible = "st,stm32f4-gcan", "syscon";
+			reg = <0x40006600 0x200>;
+			clocks = <&rcc 0 STM32F4_APB1_CLOCK(CAN1)>;
+		};
+
+		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-master;
+			st,gcan = <&gcan>;
+			status = "disabled";
+		};
+
+		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