Hi, Series ------ am62, am62a and am62p support Partial-IO, a poweroff SoC state with a few pin groups being active for wakeup. To support mcu_mcan0 and mcu_mcan1 wakeup for the mentioned SoCs, the series introduces a notion of wake-on-lan for m_can. If the user decides to enable wake-on-lan for a m_can device, the device is set to wakeup enabled. A 'wakeup' pinctrl state is selected to enable wakeup flags for the relevant pins. If wake-on-lan is disabled the default pinctrl is selected. After feedback from Nishanth and Krzysztof, I moved to a wakeup-source property that can be a list of powerstates in which the device is wakeup capable. This describes special cases like Partial-IO where the device is powered off but pins can be sensible to changes and trigger a wakeup. It is based on v6.13-rc1. Partial-IO ---------- This series is part of a bigger topic to support Partial-IO on am62, am62a and am62p. Partial-IO is a poweroff state in which some pins are able to wakeup the SoC. In detail MCU m_can and two serial port pins can trigger the wakeup. A documentation can also be found in section 6.2.4 in the TRM: https://www.ti.com/lit/pdf/spruiv7 This other series is relevant for the support of Partial-IO: - firmware: ti_sci: Partial-IO support https://gitlab.baylibre.com/msp8/linux/-/tree/topic/am62-partialio/v6.13?ref_type=heads Testing ------- A test branch is available here that includes all patches required to test Partial-IO: https://gitlab.baylibre.com/msp8/linux/-/tree/integration/am62-partialio/v6.13?ref_type=heads After enabling Wake-on-LAN the system can be powered off and will enter the Partial-IO state in which it can be woken up by activity on the specific pins: ethtool -s can0 wol p ethtool -s can1 wol p poweroff I tested these patches on am62-lp-sk. Best, Markus Previous versions: v1: https://lore.kernel.org/lkml/20240523075347.1282395-1-msp@xxxxxxxxxxxx/ v2: https://lore.kernel.org/lkml/20240729074135.3850634-1-msp@xxxxxxxxxxxx/ v3: https://lore.kernel.org/lkml/20241011-topic-mcan-wakeup-source-v6-12-v3-0-9752c714ad12@xxxxxxxxxxxx v4: https://lore.kernel.org/r/20241015-topic-mcan-wakeup-source-v6-12-v4-0-fdac1d1e7aa6@xxxxxxxxxxxx v5: https://lore.kernel.org/r/20241028-topic-mcan-wakeup-source-v6-12-v5-0-33edc0aba629@xxxxxxxxxxxx Changes in v6: - Rebased to v6.13-rc1 - After feedback of the other Partial-IO series, I updated this series and removed all use of regulator-related patches. - wakeup-source is now not only a boolean property but can also be a list of power states in which the device is wakeup capable. Changes in v5: - Make the check of wol options nicer to read Changes in v4: - Remove leftover testing code that always returned -EIO in a specific - Redesign pincontrol setup to be easier understandable and less nested - Fix missing parantheses around wol_enable expression - Remove | from binding description Changes in v3: - Rebase to v6.12-rc1 - Change 'wakeup-source' to only 'true' - Simplify m_can_set_wol by returning early on error - Add vio-suuply binding and handling of this optional property. vio-supply is used to reflect the SoC architecture and which power line powers the m_can unit. This is important as some units are powered in special low power modes. Changes in v2: - Rebase to v6.11-rc1 - Squash these two patches for the binding into one: dt-bindings: can: m_can: Add wakeup-source property dt-bindings: can: m_can: Add wakeup pinctrl state - Add error handling to multiple patches of the m_can driver - Add error handling in m_can_class_allocate_dev(). This also required to add a new patch to return error pointers from m_can_class_allocate_dev(). Signed-off-by: Markus Schneider-Pargmann <msp@xxxxxxxxxxxx> --- Markus Schneider-Pargmann (6): dt-bindings: can: m_can: Add wakeup properties can: m_can: Map WoL to device_set_wakeup_enable can: m_can: Return ERR_PTR on error in allocation can: m_can: Support pinctrl wakeup state arm64: dts: ti: k3-am62: Mark mcu_mcan0/1 as wakeup-source arm64: dts: ti: k3-am62a-mcu: Mark mcu_mcan0/1 as wakeup-source Vibhore Vardhan (1): arm64: dts: ti: k3-am62p-mcu: Mark mcu_mcan0/1 as wakeup-source .../devicetree/bindings/net/can/bosch,m_can.yaml | 27 +++++ arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi | 2 + arch/arm64/boot/dts/ti/k3-am62a-mcu.dtsi | 2 + .../boot/dts/ti/k3-am62p-j722s-common-mcu.dtsi | 2 + drivers/net/can/m_can/m_can.c | 111 ++++++++++++++++++++- drivers/net/can/m_can/m_can.h | 4 + drivers/net/can/m_can/m_can_pci.c | 4 +- drivers/net/can/m_can/m_can_platform.c | 4 +- drivers/net/can/m_can/tcan4x5x-core.c | 4 +- 9 files changed, 151 insertions(+), 9 deletions(-) --- base-commit: 40384c840ea1944d7c5a392e8975ed088ecf0b37 change-id: 20241009-topic-mcan-wakeup-source-v6-12-8c1d69931bd8 Best regards, -- Markus Schneider-Pargmann <msp@xxxxxxxxxxxx>
