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[79.31.31.9]) by smtp.gmail.com with ESMTPSA id gx14-20020a1709068a4e00b0072b33e91f96sm3336112ejc.190.2022.08.20.01.30.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 20 Aug 2022 01:30:03 -0700 (PDT) From: Dario Binacchi To: linux-kernel@vger.kernel.org Cc: Alexandre Torgue , Amarula patchwork , Marc Kleine-Budde , michael@amarulasolutions.com, Dario Binacchi , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Krzysztof Kozlowski , Maxime Coquelin , Paolo Abeni , Rob Herring , Wolfgang Grandegger , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-can@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, netdev@vger.kernel.org Subject: [RFC PATCH v2 0/4] can: bxcan: add support for ST bxCAN controller Date: Sat, 20 Aug 2022 10:29:32 +0200 Message-Id: <20220820082936.686924-1-dario.binacchi@amarulasolutions.com> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The series adds support for the basic extended CAN controller (bxCAN) found in many low- to middle-end STM32 SoCs. The driver design (one core module and one driver module) was inspired by other ST drivers (e. g. drivers/iio/adc/stm32-adc.c, drivers/iio/adc/stm32-adc-core.c) where device instances share resources. The shared resources functions are implemented in the core module, the device driver in a separate module. The driver has been tested on the stm32f469i-discovery board with a kernel version 5.19.0-rc2 in loopback + silent mode: ip link set can0 type can bitrate 125000 loopback on listen-only on ip link set up can0 candump can0 -L & cansend can0 300#AC.AB.AD.AE.75.49.AD.D1 For uboot and kernel compilation, as well as for rootfs creation I used buildroot: make stm32f469_disco_sd_defconfig make but I had to patch can-utils and busybox as can-utils and iproute are not compiled for MMU-less microcotrollers. In the case of can-utils, replacing the calls to fork() with vfork(), I was able to compile the package with working candump and cansend applications, while in the case of iproute, I ran into more than one problem and finally I decided to extend busybox's ip link command for CAN-type devices. I'm still wondering if it was really necessary, but this way I was able to test the driver. 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. - Remove a blank line. - Fix sparse errors. - Create a MAINTAINERS entry. - Remove the print of the registers address. - Remove the volatile keyword from bxcan_rmw(). - Use tx ring algorithm to manage tx mailboxes. - Use can_{get|put}_echo_skb(). - Update DT properties. Dario Binacchi (4): dt-bindings: net: can: add STM32 bxcan DT bindings ARM: dts: stm32: add CAN support on stm32f429 ARM: dts: stm32: add pin map for CAN controller on stm32f4 can: bxcan: add support for ST bxCAN controller .../bindings/net/can/st,stm32-bxcan.yaml | 136 +++ MAINTAINERS | 7 + arch/arm/boot/dts/stm32f4-pinctrl.dtsi | 31 + arch/arm/boot/dts/stm32f429.dtsi | 30 + drivers/net/can/Kconfig | 1 + drivers/net/can/Makefile | 1 + drivers/net/can/bxcan/Kconfig | 34 + drivers/net/can/bxcan/Makefile | 4 + drivers/net/can/bxcan/bxcan-core.c | 200 ++++ drivers/net/can/bxcan/bxcan-core.h | 33 + drivers/net/can/bxcan/bxcan-drv.c | 1043 +++++++++++++++++ 11 files changed, 1520 insertions(+) create mode 100644 Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml create mode 100644 drivers/net/can/bxcan/Kconfig create mode 100644 drivers/net/can/bxcan/Makefile create mode 100644 drivers/net/can/bxcan/bxcan-core.c create mode 100644 drivers/net/can/bxcan/bxcan-core.h create mode 100644 drivers/net/can/bxcan/bxcan-drv.c -- 2.32.0