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From:   Dario Binacchi <dario.binacchi@amarulasolutions.com>
To:     linux-kernel@vger.kernel.org
Cc:     michael@amarulasolutions.com,
        Amarula patchwork <linux-amarula@amarulasolutions.com>,
        Dario Binacchi <dario.binacchi@amarulasolutions.com>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Rob Herring <robh+dt@kernel.org>, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-stm32@st-md-mailman.stormreply.com
Subject: [PATCH v2 5/5] ARM: dts: stm32: add CAN support on stm32f746
Date:   Thu, 27 Apr 2023 22:45:40 +0200
Message-Id: <20230427204540.3126234-6-dario.binacchi@amarulasolutions.com>
In-Reply-To: <20230427204540.3126234-1-dario.binacchi@amarulasolutions.com>
References: <20230427204540.3126234-1-dario.binacchi@amarulasolutions.com>
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Add support for bxcan (Basic eXtended CAN controller) to STM32F746. The
chip contains three CAN peripherals, CAN1 and CAN2 in dual peripheral
configuration and CAN3 in single peripheral configuration:
- Dual CAN peripheral configuration:
  * CAN1: Primary bxCAN for managing the communication between a secondary
    bxCAN and the 512-byte SRAM memory.
  * CAN2: Secondary bxCAN with no direct access to the SRAM memory.
  This means that the two bxCAN cells share the 512-byte SRAM memory and
  CAN2 can't be used without enabling CAN1.
- Single CAN peripheral configuration:
  * CAN3: Primary bxCAN with dedicated Memory Access Controller unit and
    512-byte SRAM memory.

 -------------------------------------------------------------------------
| features | CAN1              | CAN2               | CAN 3               |
 -------------------------------------------------------------------------
| SRAM     | 512-byte shared between CAN1 & CAN2    | 512-byte            |
 -------------------------------------------------------------------------
| Filters  | 26 filters shared between CAN1 & CAN2  | 14 filters          |
 -------------------------------------------------------------------------

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

---

Changes in v2:
- Move after the patch "can: bxcan: add support for single peripheral configuration".
- Add node gcan3.
- Rename gcan as gcan1.
- Add property "st,can-secondary" to can2 node.
- Drop patch "dt-bindings: mfd: stm32f7: add binding definition for CAN3"
  because it has been accepted.
- Add patch "ARM: dts: stm32f429: put can2 in secondary mode".
- Add patch "dt-bindings: net: can: add "st,can-secondary" property".

 arch/arm/boot/dts/stm32f746.dtsi | 47 ++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/arch/arm/boot/dts/stm32f746.dtsi b/arch/arm/boot/dts/stm32f746.dtsi
index dc868e6da40e..973698bc9ef4 100644
--- a/arch/arm/boot/dts/stm32f746.dtsi
+++ b/arch/arm/boot/dts/stm32f746.dtsi
@@ -257,6 +257,23 @@ rtc: rtc@40002800 {
 			status = "disabled";
 		};
 
+		can3: can@40003400 {
+			compatible = "st,stm32f4-bxcan";
+			reg = <0x40003400 0x200>;
+			interrupts = <104>, <105>, <106>, <107>;
+			interrupt-names = "tx", "rx0", "rx1", "sce";
+			resets = <&rcc STM32F7_APB1_RESET(CAN3)>;
+			clocks = <&rcc 0 STM32F7_APB1_CLOCK(CAN3)>;
+			st,gcan = <&gcan3>;
+			status = "disabled";
+		};
+
+		gcan3: gcan@40003600 {
+			compatible = "st,stm32f4-gcan", "syscon";
+			reg = <0x40003600 0x200>;
+			clocks = <&rcc 0 STM32F7_APB1_CLOCK(CAN3)>;
+		};
+
 		usart2: serial@40004400 {
 			compatible = "st,stm32f7-uart";
 			reg = <0x40004400 0x400>;
@@ -337,6 +354,36 @@ i2c4: i2c@40006000 {
 			status = "disabled";
 		};
 
+		can1: can@40006400 {
+			compatible = "st,stm32f4-bxcan";
+			reg = <0x40006400 0x200>;
+			interrupts = <19>, <20>, <21>, <22>;
+			interrupt-names = "tx", "rx0", "rx1", "sce";
+			resets = <&rcc STM32F7_APB1_RESET(CAN1)>;
+			clocks = <&rcc 0 STM32F7_APB1_CLOCK(CAN1)>;
+			st,can-primary;
+			st,gcan = <&gcan1>;
+			status = "disabled";
+		};
+
+		gcan1: gcan@40006600 {
+			compatible = "st,stm32f4-gcan", "syscon";
+			reg = <0x40006600 0x200>;
+			clocks = <&rcc 0 STM32F7_APB1_CLOCK(CAN1)>;
+		};
+
+		can2: can@40006800 {
+			compatible = "st,stm32f4-bxcan";
+			reg = <0x40006800 0x200>;
+			interrupts = <63>, <64>, <65>, <66>;
+			interrupt-names = "tx", "rx0", "rx1", "sce";
+			resets = <&rcc STM32F7_APB1_RESET(CAN2)>;
+			clocks = <&rcc 0 STM32F7_APB1_CLOCK(CAN2)>;
+			st,can-secondary;
+			st,gcan = <&gcan1>;
+			status = "disabled";
+		};
+
 		cec: cec@40006c00 {
 			compatible = "st,stm32-cec";
 			reg = <0x40006C00 0x400>;
-- 
2.32.0