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Miller" , Jakub Kicinski , Rob Herring , Kishon Vijay Abraham I , Vinod Koul , , , Vignesh Raghavendra , Lokesh Vutla , Grygorii Strashko , Aswath Govindraju Subject: [PATCH v2 0/6] CAN TRANSCEIVER: Add support for CAN transceivers Date: Wed, 14 Apr 2021 19:35:15 +0530 Message-ID: <20210414140521.11463-1-a-govindraju@ti.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210414_150544_046353_CFB547DB X-CRM114-Status: GOOD ( 18.63 ) X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org The following series of patches add support for CAN transceivers. TCAN1042 has a standby signal that needs to be pulled high for sending/receiving messages[1]. TCAN1043 has a enable signal along with standby signal that needs to be pulled up for sending/receiving messages[2], and other combinations of the two lines can be used to put the transceiver in different states to reduce power consumption. On boards like the AM654-idk and J721e-evm these signals are controlled using gpios. Patch 1 rewords the comment that restricts max_link_rate attribute to have units of Mbps. Patch 2 adds an API for devm_of_phy_optional_get_by_index Patch 3 models the transceiver as a phy device tree node with properties for max bit rate supported, gpio properties for indicating gpio pin numbers to which standby and enable signals are connected. Patch 4 adds a generic driver to support CAN transceivers. Patches 5 & 6 add support for implementing the transceiver as a phy of m_can_platform driver. changes since v1: - Added patch 1 (in v2) that rewords the comment that restrict max_link_rate attribute to have units of Mbps. - Added patch 2 (in v2) that adds an API for devm_of_phy_optional_get_by_index - Patch 1 (in v1) - updated MAINTAINERS file - Patch 2 (in v1) - replaced m_can with CAN to make the driver independent of CAN driver - Added prefix CAN_TRANSCEIVER for EN_PRESENT and STB_PRESENT - Added new line before return statements in power_on() and power_off - Added error handling patch for devm_kzalloc() - used the max_link_rate attribute directly instead of dividing it by 1000000 - removed the spaces before GPIOD_OUT_LOW in devm_gpiod_get() - Corrected requested value for standby-gpios to GPIOD_OUT_HIGH - Updated MAINTAINERS file - Patch 3 (in v1) - replaced minItems with maxItems - Removed phy-names property as there is only one phy - Patch 4 (in v1) - replaced dev_warn with dev_info when no transceiver is found - Added struct phy * field in m_can_classdev struct - moved phy_power_on and phy_power_off to m_can_open and m_can_close respectively - Moved the check for max_bit_rate to generice transceiver driver [1] - https://www.ti.com/lit/ds/symlink/tcan1042h.pdf [2] - https://www.ti.com/lit/ds/symlink/tcan1043-q1.pdf Aswath Govindraju (4): phy: core: Reword the comment specifying the units of max_link_rate to be Mbps phy: Add API for devm_of_phy_optional_get_by_index dt-bindings: phy: Add binding for TI TCAN104x CAN transceivers phy: phy-can-transceiver: Add support for generic CAN transceiver driver Faiz Abbas (2): dt-bindings: net: can: Document transceiver implementation as phy can: m_can: Add support for transceiver as phy .../bindings/net/can/bosch,m_can.yaml | 3 + .../bindings/phy/ti,tcan104x-can.yaml | 56 +++++++ MAINTAINERS | 2 + drivers/net/can/m_can/m_can.c | 18 +++ drivers/net/can/m_can/m_can.h | 2 + drivers/net/can/m_can/m_can_platform.c | 15 ++ drivers/phy/Kconfig | 9 ++ drivers/phy/Makefile | 1 + drivers/phy/phy-can-transceiver.c | 146 ++++++++++++++++++ drivers/phy/phy-core.c | 26 ++++ include/linux/phy/phy.h | 4 +- 11 files changed, 281 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml create mode 100644 drivers/phy/phy-can-transceiver.c