[PATCH v3 0/6] arm64: dts: ti: k3-am62: Add wakeup-sources for low power modes

[PATCH v3 0/6] arm64: dts: ti: k3-am62: Add wakeup-sources for low power modes

[Markus Schneider-Pargmann (TI.com)]

Hi,

This series adds devicetree changes needed for Partial-IO support on TI
am62, am62a, and am62p SoCs. It defines system states for various low
power modes and configures the wakeup-sources for devices in the CANUART
group. Depending on the SoC and board details, some low power modes may
not be available, so the wakeup-sources are described in the board
files. The series also adds the necessary pinctrl settings required for
proper wakeup functionality.

Partial-IO Overview
------------------
Partial-IO is a low power system state in which nearly everything is
turned off except the pins of the CANUART group (mcu_mcan0, mcu_mcan1,
wkup_uart0 and mcu_uart0). These devices can trigger a wakeup of the
system on pin activity. Note that this does not resume the system as the
DDR is off as well. So this state can be considered a power-off state
with wakeup capabilities.

A documentation can also be found in section 6.2.4 in the TRM:
  https://www.ti.com/lit/pdf/spruiv7

Implementation Details
----------------------
The complete Partial-IO feature requires three coordinated series, each
handling a different aspect of the implementation:

1. m_can driver series: Implements device-specific wakeup functionality
   for m_can devices, allowing them to be set as wakeup sources.
    https://gitlab.baylibre.com/msp8/linux/-/tree/topic/mcan-wakeup-source/v6.17?ref_type=heads
    https://lore.kernel.org/r/20250812-topic-mcan-wakeup-source-v6-12-v8-0-6972a810d63b@baylibre.com

2. This series (devicetree): Defines system states and wakeup sources in
   the devicetree for am62, am62a and am62p.

3. TI-SCI firmware series: Implements the firmware interface to enter
   Partial-IO mode when appropriate wakeup sources are enabled.
    https://gitlab.baylibre.com/msp8/linux/-/tree/topic/tisci-partialio/v6.17?ref_type=heads

Devicetree Bindings
-------------------
This series depends on the dt-schema pull request that adds bindings for
system-idle-states and updates the binding for wakeup-source:
  https://github.com/devicetree-org/dt-schema/pull/150

This is merged now in upstream dt-schema. These new bindings allow us to
define the system states and reference them from device wakeup-source
properties.

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/v6.17?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
-----------------
 - Link to v2: https://lore.kernel.org/r/20250812-topic-am62-dt-partialio-v6-15-v2-0-25352364a0ac@baylibre.com
 - Link to v1: https://lore.kernel.org/r/20250421-topic-am62-dt-partialio-v6-15-v1-0-6ced30aafddb@baylibre.com
 - As part of the series "firmware: ti_sci: Partial-IO support"
   https://lore.kernel.org/r/20250306-topic-am62-partialio-v6-12-b4-v5-0-f9323d3744a2@baylibre.com

Changes in v3:
 - Drop patch to add WKUP_EN and rebase to linux-next to base on the
   patch that accepted which adds PIN_WKUP_EN instead
   https://lore.kernel.org/all/20250909044108.2541534-1-a-kaur@ti.com/
 - Fix small typos in the commit messages
 - Use AM62AX_MCU_IOPAD for am62a and AM62PX_MCU_IOPAD for am62p

Changes in v2:
 - Combine k3-am62a7-sk.dts devicetree nodes with existing ones
 - Combine k3-am62p5-sk.dts devicetree nodes with existing ones
 - Update the idle-state-name properties to the new names from the
   dt-schema
 - Rebase to 6.17-rc1

Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>
---
Markus Schneider-Pargmann (TI.com) (6):
      arm64: dts: ti: k3-am62: Define possible system states
      arm64: dts: ti: k3-am62a: Define possible system states
      arm64: dts: ti: k3-am62p: Define possible system states
      arm64: dts: ti: k3-am62-lp-sk: Set wakeup-source system-states
      arm64: dts: ti: k3-am62a7-sk: Set wakeup-source system-states
      arm64: dts: ti: k3-am62p5-sk: Set wakeup-source system-states

 arch/arm64/boot/dts/ti/k3-am62-lp-sk.dts | 60 +++++++++++++++++++++++++++
 arch/arm64/boot/dts/ti/k3-am62.dtsi      | 22 ++++++++++
 arch/arm64/boot/dts/ti/k3-am62a.dtsi     | 27 ++++++++++++
 arch/arm64/boot/dts/ti/k3-am62a7-sk.dts  | 71 ++++++++++++++++++++++++++++++++
 arch/arm64/boot/dts/ti/k3-am62p.dtsi     | 27 ++++++++++++
 arch/arm64/boot/dts/ti/k3-am62p5-sk.dts  | 71 ++++++++++++++++++++++++++++++++
 6 files changed, 278 insertions(+)
---
base-commit: 24c4d4041c2ec11c47baf6ea54f9379cf88809fc
change-id: 20250415-topic-am62-dt-partialio-v6-15-327dd1ff17da
prerequisite-change-id: 20241009-topic-mcan-wakeup-source-v6-12-8c1d69931bd8:v10
prerequisite-patch-id: 40ff771d13dccae91c04ab120aa1b5e406b66e47
prerequisite-patch-id: 830b339ea452edd750b04f719da91e721be630cb
prerequisite-patch-id: 2c9142d2bc47e64c49b7b8a7ca20a62a0be14870
prerequisite-patch-id: aa64f7e9fcc3fcbb3cb871a05a07f398f3aa8231

Best regards,
-- 
Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>

[PATCH v3 1/6] arm64: dts: ti: k3-am62: Define possible system states

[Markus Schneider-Pargmann (TI.com)]

Add the system states that are available on TI AM62 SoCs.

Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>
---
 arch/arm64/boot/dts/ti/k3-am62.dtsi | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62.dtsi b/arch/arm64/boot/dts/ti/k3-am62.dtsi
index 59f6dff552ed40e4ac0f9c7077aa25d68d3b5283..b08b7062060ca12ecae83917a831ee779f1a288f 100644
--- a/arch/arm64/boot/dts/ti/k3-am62.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62.dtsi
@@ -46,6 +46,28 @@ pmu: pmu {
 		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_HIGH>;
 	};
 
+	system-idle-states {
+		system_partial_io: system-partial-io {
+			compatible = "system-idle-state";
+			idle-state-name = "off-wake";
+		};
+
+		system_deep_sleep: system-deep-sleep {
+			compatible = "system-idle-state";
+			idle-state-name = "mem";
+		};
+
+		system_mcu_only: system-mcu-only {
+			compatible = "system-idle-state";
+			idle-state-name = "mem-mcu-active";
+		};
+
+		system_standby: system-standby {
+			compatible = "system-idle-state";
+			idle-state-name = "standby";
+		};
+	};
+
 	cbass_main: bus@f0000 {
 		bootph-all;
 		compatible = "simple-bus";

-- 
2.51.0

[PATCH v3 2/6] arm64: dts: ti: k3-am62a: Define possible system states

[Markus Schneider-Pargmann (TI.com)]

Add the system states that are available on TI AM62A SoCs.

Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>
---
 arch/arm64/boot/dts/ti/k3-am62a.dtsi | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62a.dtsi b/arch/arm64/boot/dts/ti/k3-am62a.dtsi
index 4d79b3e9486af18b8813a8980a57937669ff6095..31b2de035f0f748e34b8919f90251aa0551d9b32 100644
--- a/arch/arm64/boot/dts/ti/k3-am62a.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62a.dtsi
@@ -46,6 +46,33 @@ pmu: pmu {
 		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_HIGH>;
 	};
 
+	system-idle-states {
+		system_partial_io: system-partial-io {
+			compatible = "system-idle-state";
+			idle-state-name = "off-wake";
+		};
+
+		system_io_ddr: system-io-ddr {
+			compatible = "system-idle-state";
+			idle-state-name = "mem-deep";
+		};
+
+		system_deep_sleep: system-deep-sleep {
+			compatible = "system-idle-state";
+			idle-state-name = "mem";
+		};
+
+		system_mcu_only: system-mcu-only {
+			compatible = "system-idle-state";
+			idle-state-name = "mem-mcu-active";
+		};
+
+		system_standby: system-standby {
+			compatible = "system-idle-state";
+			idle-state-name = "standby";
+		};
+	};
+
 	cbass_main: bus@f0000 {
 		compatible = "simple-bus";
 		#address-cells = <2>;

-- 
2.51.0

[PATCH v3 3/6] arm64: dts: ti: k3-am62p: Define possible system states

[Markus Schneider-Pargmann (TI.com)]

Add the system states that are available on TI AM62P SoCs.

Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>
---
 arch/arm64/boot/dts/ti/k3-am62p.dtsi | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62p.dtsi b/arch/arm64/boot/dts/ti/k3-am62p.dtsi
index 75a15c368c11b068430362fe0b8d2d9ecc052588..c69e16f16c835489f2bc5cba158235ab955347e3 100644
--- a/arch/arm64/boot/dts/ti/k3-am62p.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62p.dtsi
@@ -44,6 +44,33 @@ pmu: pmu {
 		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_HIGH>;
 	};
 
+	system-idle-states {
+		system_partial_io: system-partial-io {
+			compatible = "system-idle-state";
+			idle-state-name = "off-wake";
+		};
+
+		system_io_ddr: system-io-ddr {
+			compatible = "system-idle-state";
+			idle-state-name = "mem-deep";
+		};
+
+		system_deep_sleep: system-deep-sleep {
+			compatible = "system-idle-state";
+			idle-state-name = "mem";
+		};
+
+		system_mcu_only: system-mcu-only {
+			compatible = "system-idle-state";
+			idle-state-name = "mem-mcu-active";
+		};
+
+		system_standby: system-standby {
+			compatible = "system-idle-state";
+			idle-state-name = "standby";
+		};
+	};
+
 	cbass_main: bus@f0000 {
 		compatible = "simple-bus";
 		#address-cells = <2>;

-- 
2.51.0

[PATCH v3 4/6] arm64: dts: ti: k3-am62-lp-sk: Set wakeup-source system-states

[Markus Schneider-Pargmann (TI.com)]

The CANUART pins of mcu_mcan0, mcu_mcan1, mcu_uart0 and wkup_uart0 are
powered during Partial-IO and I/O Only + DDR and are capable of waking
up the system in these states. Specify the states in which these units
can do a wakeup on this board.

Note that the UARTs are not capable of wakeup in Partial-IO because of
of a UART mux on the board not being powered during Partial-IO. As I/O
Only + DDR is not supported on AM62x, the UARTs are not added in this
patch.

Add pincontrol definitions for mcu_mcan0 and mcu_mcan1 for wakeup from
Partial-IO. Add these as wakeup pinctrl entries for both devices.

Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>
---
 arch/arm64/boot/dts/ti/k3-am62-lp-sk.dts | 60 ++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62-lp-sk.dts b/arch/arm64/boot/dts/ti/k3-am62-lp-sk.dts
index ecfba05fe5c273c671cd0968f3eceaf54d22ac7d..cb63db337b2bc4c83b48dde693b95dd9fd93cd26 100644
--- a/arch/arm64/boot/dts/ti/k3-am62-lp-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am62-lp-sk.dts
@@ -276,3 +276,63 @@ &main_gpio1 {
 &gpmc0 {
 	ranges = <0 0 0x00 0x51000000 0x01000000>; /* CS0 space. Min partition = 16MB */
 };
+
+&mcu_mcan0 {
+	pinctrl-names = "default", "wakeup";
+	pinctrl-0 = <&mcu_mcan0_tx_pins_default>, <&mcu_mcan0_rx_pins_default>;
+	pinctrl-1 = <&mcu_mcan0_tx_pins_default>, <&mcu_mcan0_rx_pins_wakeup>;
+	wakeup-source = <&system_partial_io>,
+			<&system_deep_sleep>,
+			<&system_mcu_only>,
+			<&system_standby>;
+	status = "okay";
+};
+
+&mcu_mcan1 {
+	pinctrl-names = "default", "wakeup";
+	pinctrl-0 = <&mcu_mcan1_tx_pins_default>, <&mcu_mcan1_rx_pins_default>;
+	pinctrl-1 = <&mcu_mcan1_tx_pins_default>, <&mcu_mcan1_rx_pins_wakeup>;
+	wakeup-source = <&system_partial_io>,
+			<&system_deep_sleep>,
+			<&system_mcu_only>,
+			<&system_standby>;
+	status = "okay";
+};
+
+&mcu_pmx0 {
+	mcu_mcan0_tx_pins_default: mcu-mcan0-tx-default-pins {
+		pinctrl-single,pins = <
+			AM62X_IOPAD(0x034, PIN_OUTPUT, 0) /* (D6) MCU_MCAN0_TX */
+		>;
+	};
+
+	mcu_mcan0_rx_pins_default: mcu-mcan0-rx-default-pins {
+		pinctrl-single,pins = <
+			AM62X_IOPAD(0x038, PIN_INPUT, 0) /* (B3) MCU_MCAN0_RX */
+		>;
+	};
+
+	mcu_mcan0_rx_pins_wakeup: mcu-mcan0-rx-wakeup-pins {
+		pinctrl-single,pins = <
+			AM62X_IOPAD(0x038, PIN_INPUT | PIN_WKUP_EN, 0) /* (B3) MCU_MCAN0_RX */
+		>;
+	};
+
+	mcu_mcan1_tx_pins_default: mcu-mcan1-tx-default-pins {
+		pinctrl-single,pins = <
+			AM62X_IOPAD(0x03c, PIN_OUTPUT, 0) /* (E5) MCU_MCAN1_TX */
+		>;
+	};
+
+	mcu_mcan1_rx_pins_default: mcu-mcan1-rx-default-pins {
+		pinctrl-single,pins = <
+			AM62X_IOPAD(0x040, PIN_INPUT, 0) /* (D4) MCU_MCAN1_RX */
+		>;
+	};
+
+	mcu_mcan1_rx_pins_wakeup: mcu-mcan1-rx-wakeup-pins {
+		pinctrl-single,pins = <
+			AM62X_IOPAD(0x040, PIN_INPUT | PIN_WKUP_EN, 0) /* (D4) MCU_MCAN1_RX */
+		>;
+	};
+};

-- 
2.51.0

[PATCH v3 5/6] arm64: dts: ti: k3-am62a7-sk: Set wakeup-source system-states

[Markus Schneider-Pargmann (TI.com)]

The CANUART pins of mcu_mcan0, mcu_mcan1, mcu_uart0 and wkup_uart0 are
powered during Partial-IO and I/O Only + DDR and are capable of waking
up the system in these states. Specify the states in which these units
can do a wakeup on this board.

Note that the UARTs are not capable of wakeup in Partial-IO because of
of a UART mux on the board not being powered during Partial-IO.

Add pincontrol definitions for mcu_mcan0 and mcu_mcan1 for wakeup from
Partial-IO. Add these as wakeup pinctrl entries for both devices.

Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>
---
 arch/arm64/boot/dts/ti/k3-am62a7-sk.dts | 71 +++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
index af591fe6ae4f0a91991d2904a9a61905a0eeb614..8525aa5ab812c51e2d3371b39baa5e936e616158 100644
--- a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
@@ -233,6 +233,10 @@ AM62AX_MCU_IOPAD(0x0030, PIN_OUTPUT, 0) /* (C8) WKUP_UART0_RTSn */
 &wkup_uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&wkup_uart0_pins_default>;
+	wakeup-source = <&system_io_ddr>,
+			<&system_deep_sleep>,
+			<&system_mcu_only>,
+			<&system_standby>;
 	status = "reserved";
 };
 
@@ -426,6 +430,42 @@ pmic_irq_pins_default: pmic-irq-default-pins {
 			AM62AX_MCU_IOPAD(0x000, PIN_INPUT, 7) /* (E11) MCU_GPIO0_0 */
 		>;
 	};
+
+	mcu_mcan0_tx_pins_default: mcu-mcan0-tx-default-pins {
+		pinctrl-single,pins = <
+			AM62AX_MCU_IOPAD(0x034, PIN_OUTPUT, 0) /* (D6) MCU_MCAN0_TX */
+		>;
+	};
+
+	mcu_mcan0_rx_pins_default: mcu-mcan0-rx-default-pins {
+		pinctrl-single,pins = <
+			AM62AX_MCU_IOPAD(0x038, PIN_INPUT, 0) /* (B3) MCU_MCAN0_RX */
+		>;
+	};
+
+	mcu_mcan0_rx_pins_wakeup: mcu-mcan0-rx-wakeup-pins {
+		pinctrl-single,pins = <
+			AM62AX_MCU_IOPAD(0x038, PIN_INPUT | PIN_WKUP_EN, 0) /* (B3) MCU_MCAN0_RX */
+		>;
+	};
+
+	mcu_mcan1_tx_pins_default: mcu-mcan1-tx-default-pins {
+		pinctrl-single,pins = <
+			AM62AX_MCU_IOPAD(0x03c, PIN_OUTPUT, 0) /* (E5) MCU_MCAN1_TX */
+		>;
+	};
+
+	mcu_mcan1_rx_pins_default: mcu-mcan1-rx-default-pins {
+		pinctrl-single,pins = <
+			AM62AX_MCU_IOPAD(0x040, PIN_INPUT, 0) /* (D4) MCU_MCAN1_RX */
+		>;
+	};
+
+	mcu_mcan1_rx_pins_wakeup: mcu-mcan1-rx-wakeup-pins {
+		pinctrl-single,pins = <
+			AM62AX_MCU_IOPAD(0x040, PIN_INPUT | PIN_WKUP_EN, 0) /* (D4) MCU_MCAN1_RX */
+		>;
+	};
 };
 
 &mcu_gpio0 {
@@ -852,4 +892,35 @@ AM62AX_IOPAD(0x008, PIN_INPUT, 0) /* (J24) OSPI0_DQS */
 	};
 };
 
+&mcu_mcan0 {
+	pinctrl-names = "default", "wakeup";
+	pinctrl-0 = <&mcu_mcan0_tx_pins_default>, <&mcu_mcan0_rx_pins_default>;
+	pinctrl-1 = <&mcu_mcan0_tx_pins_default>, <&mcu_mcan0_rx_pins_wakeup>;
+	wakeup-source = <&system_partial_io>,
+			<&system_io_ddr>,
+			<&system_deep_sleep>,
+			<&system_mcu_only>,
+			<&system_standby>;
+	status = "okay";
+};
+
+&mcu_mcan1 {
+	pinctrl-names = "default", "wakeup";
+	pinctrl-0 = <&mcu_mcan1_tx_pins_default>, <&mcu_mcan1_rx_pins_default>;
+	pinctrl-1 = <&mcu_mcan1_tx_pins_default>, <&mcu_mcan1_rx_pins_wakeup>;
+	wakeup-source = <&system_partial_io>,
+			<&system_io_ddr>,
+			<&system_deep_sleep>,
+			<&system_mcu_only>,
+			<&system_standby>;
+	status = "okay";
+};
+
+&mcu_uart0 {
+	wakeup-source = <&system_io_ddr>,
+			<&system_deep_sleep>,
+			<&system_mcu_only>,
+			<&system_standby>;
+};
+
 #include "k3-am62a-ti-ipc-firmware.dtsi"

-- 
2.51.0

[PATCH v3 6/6] arm64: dts: ti: k3-am62p5-sk: Set wakeup-source system-states

[Markus Schneider-Pargmann (TI.com)]

The CANUART pins of mcu_mcan0, mcu_mcan1, mcu_uart0 and wkup_uart0 are
powered during Partial-IO and I/O Only + DDR and are capable of waking
up the system in these states. Specify the states in which these units
can do a wakeup on this board.

Note that the UARTs are not capable of wakeup in Partial-IO because of
of a UART mux on the board not being powered during Partial-IO.

Add pincontrol definitions for mcu_mcan0 and mcu_mcan1 for wakeup from
Partial-IO. Add these as wakeup pinctrl entries for both devices.

Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>
---
 arch/arm64/boot/dts/ti/k3-am62p5-sk.dts | 71 +++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts b/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts
index a064a632680ec69dba9dbe591fd49caeb9ac1111..36116210fbe6111ee8bb9a1736ed02bec0f20b67 100644
--- a/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts
@@ -716,12 +716,52 @@ AM62PX_MCU_IOPAD(0x028, PIN_OUTPUT, 0)	/* (D7) WKUP_UART0_TXD */
 		>;
 		bootph-all;
 	};
+
+	mcu_mcan0_tx_pins_default: mcu-mcan0-tx-default-pins {
+		pinctrl-single,pins = <
+			AM62PX_MCU_IOPAD(0x034, PIN_OUTPUT, 0) /* (D6) MCU_MCAN0_TX */
+		>;
+	};
+
+	mcu_mcan0_rx_pins_default: mcu-mcan0-rx-default-pins {
+		pinctrl-single,pins = <
+			AM62PX_MCU_IOPAD(0x038, PIN_INPUT, 0) /* (B3) MCU_MCAN0_RX */
+		>;
+	};
+
+	mcu_mcan0_rx_pins_wakeup: mcu-mcan0-rx-wakeup-pins {
+		pinctrl-single,pins = <
+			AM62PX_MCU_IOPAD(0x038, PIN_INPUT | PIN_WKUP_EN, 0) /* (B3) MCU_MCAN0_RX */
+		>;
+	};
+
+	mcu_mcan1_tx_pins_default: mcu-mcan1-tx-default-pins {
+		pinctrl-single,pins = <
+			AM62PX_MCU_IOPAD(0x03c, PIN_OUTPUT, 0) /* (E5) MCU_MCAN1_TX */
+		>;
+	};
+
+	mcu_mcan1_rx_pins_default: mcu-mcan1-rx-default-pins {
+		pinctrl-single,pins = <
+			AM62PX_MCU_IOPAD(0x040, PIN_INPUT, 0) /* (D4) MCU_MCAN1_RX */
+		>;
+	};
+
+	mcu_mcan1_rx_pins_wakeup: mcu-mcan1-rx-wakeup-pins {
+		pinctrl-single,pins = <
+			AM62PX_MCU_IOPAD(0x040, PIN_INPUT | PIN_WKUP_EN, 0) /* (D4) MCU_MCAN1_RX */
+		>;
+	};
 };
 
 &wkup_uart0 {
 	/* WKUP UART0 is used by DM firmware */
 	pinctrl-names = "default";
 	pinctrl-0 = <&wkup_uart0_pins_default>;
+	wakeup-source = <&system_io_ddr>,
+			<&system_deep_sleep>,
+			<&system_mcu_only>,
+			<&system_standby>;
 	status = "reserved";
 	bootph-all;
 };
@@ -763,4 +803,35 @@ &epwm1 {
 	status = "okay";
 };
 
+&mcu_mcan0 {
+	pinctrl-names = "default", "wakeup";
+	pinctrl-0 = <&mcu_mcan0_tx_pins_default>, <&mcu_mcan0_rx_pins_default>;
+	pinctrl-1 = <&mcu_mcan0_tx_pins_default>, <&mcu_mcan0_rx_pins_wakeup>;
+	wakeup-source = <&system_partial_io>,
+			<&system_io_ddr>,
+			<&system_deep_sleep>,
+			<&system_mcu_only>,
+			<&system_standby>;
+	status = "okay";
+};
+
+&mcu_mcan1 {
+	pinctrl-names = "default", "wakeup";
+	pinctrl-0 = <&mcu_mcan1_tx_pins_default>, <&mcu_mcan1_rx_pins_default>;
+	pinctrl-1 = <&mcu_mcan1_tx_pins_default>, <&mcu_mcan1_rx_pins_wakeup>;
+	wakeup-source = <&system_partial_io>,
+			<&system_io_ddr>,
+			<&system_deep_sleep>,
+			<&system_mcu_only>,
+			<&system_standby>;
+	status = "okay";
+};
+
+&mcu_uart0 {
+	wakeup-source = <&system_io_ddr>,
+			<&system_deep_sleep>,
+			<&system_mcu_only>,
+			<&system_standby>;
+};
+
 #include "k3-am62p-ti-ipc-firmware.dtsi"

-- 
2.51.0

Re: [PATCH v3 0/6] arm64: dts: ti: k3-am62: Add wakeup-sources for low power modes

[Markus Schneider-Pargmann]

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On Wed Oct 1, 2025 at 4:34 PM CEST, Markus Schneider-Pargmann (TI.com) wrote:
> Hi,
>
> This series adds devicetree changes needed for Partial-IO support on TI
> am62, am62a, and am62p SoCs. It defines system states for various low
> power modes and configures the wakeup-sources for devices in the CANUART
> group. Depending on the SoC and board details, some low power modes may
> not be available, so the wakeup-sources are described in the board
> files. The series also adds the necessary pinctrl settings required for
> proper wakeup functionality.
>
> Partial-IO Overview
> ------------------
> Partial-IO is a low power system state in which nearly everything is
> turned off except the pins of the CANUART group (mcu_mcan0, mcu_mcan1,
> wkup_uart0 and mcu_uart0). These devices can trigger a wakeup of the
> system on pin activity. Note that this does not resume the system as the
> DDR is off as well. So this state can be considered a power-off state
> with wakeup capabilities.
>
> A documentation can also be found in section 6.2.4 in the TRM:
>   https://www.ti.com/lit/pdf/spruiv7
>
> Implementation Details
> ----------------------
> The complete Partial-IO feature requires three coordinated series, each
> handling a different aspect of the implementation:

I missed updating the lore links, here they are:

> 1. m_can driver series: Implements device-specific wakeup functionality
>    for m_can devices, allowing them to be set as wakeup sources.
>     https://gitlab.baylibre.com/msp8/linux/-/tree/topic/mcan-wakeup-source/v6.17?ref_type=heads
>     https://lore.kernel.org/r/20250812-topic-mcan-wakeup-source-v6-12-v8-0-6972a810d63b@baylibre.com

v10:
https://lore.kernel.org/r/20251001-topic-mcan-wakeup-source-v6-12-v10-0-4ab508ac5d1e@baylibre.com

> 2. This series (devicetree): Defines system states and wakeup sources in
>    the devicetree for am62, am62a and am62p.
>
> 3. TI-SCI firmware series: Implements the firmware interface to enter
>    Partial-IO mode when appropriate wakeup sources are enabled.
>     https://gitlab.baylibre.com/msp8/linux/-/tree/topic/tisci-partialio/v6.17?ref_type=heads

v8:
https://lore.kernel.org/r/20251001-topic-am62-partialio-v6-12-b4-v8-0-76a742605110@baylibre.com

Best
Markus

>
> Devicetree Bindings
> -------------------
> This series depends on the dt-schema pull request that adds bindings for
> system-idle-states and updates the binding for wakeup-source:
>   https://github.com/devicetree-org/dt-schema/pull/150
>
> This is merged now in upstream dt-schema. These new bindings allow us to
> define the system states and reference them from device wakeup-source
> properties.
>
> 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/v6.17?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
> -----------------
>  - Link to v2: https://lore.kernel.org/r/20250812-topic-am62-dt-partialio-v6-15-v2-0-25352364a0ac@baylibre.com
>  - Link to v1: https://lore.kernel.org/r/20250421-topic-am62-dt-partialio-v6-15-v1-0-6ced30aafddb@baylibre.com
>  - As part of the series "firmware: ti_sci: Partial-IO support"
>    https://lore.kernel.org/r/20250306-topic-am62-partialio-v6-12-b4-v5-0-f9323d3744a2@baylibre.com
>
> Changes in v3:
>  - Drop patch to add WKUP_EN and rebase to linux-next to base on the
>    patch that accepted which adds PIN_WKUP_EN instead
>    https://lore.kernel.org/all/20250909044108.2541534-1-a-kaur@ti.com/
>  - Fix small typos in the commit messages
>  - Use AM62AX_MCU_IOPAD for am62a and AM62PX_MCU_IOPAD for am62p
>
> Changes in v2:
>  - Combine k3-am62a7-sk.dts devicetree nodes with existing ones
>  - Combine k3-am62p5-sk.dts devicetree nodes with existing ones
>  - Update the idle-state-name properties to the new names from the
>    dt-schema
>  - Rebase to 6.17-rc1
>
> Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>
> ---
> Markus Schneider-Pargmann (TI.com) (6):
>       arm64: dts: ti: k3-am62: Define possible system states
>       arm64: dts: ti: k3-am62a: Define possible system states
>       arm64: dts: ti: k3-am62p: Define possible system states
>       arm64: dts: ti: k3-am62-lp-sk: Set wakeup-source system-states
>       arm64: dts: ti: k3-am62a7-sk: Set wakeup-source system-states
>       arm64: dts: ti: k3-am62p5-sk: Set wakeup-source system-states
>
>  arch/arm64/boot/dts/ti/k3-am62-lp-sk.dts | 60 +++++++++++++++++++++++++++
>  arch/arm64/boot/dts/ti/k3-am62.dtsi      | 22 ++++++++++
>  arch/arm64/boot/dts/ti/k3-am62a.dtsi     | 27 ++++++++++++
>  arch/arm64/boot/dts/ti/k3-am62a7-sk.dts  | 71 ++++++++++++++++++++++++++++++++
>  arch/arm64/boot/dts/ti/k3-am62p.dtsi     | 27 ++++++++++++
>  arch/arm64/boot/dts/ti/k3-am62p5-sk.dts  | 71 ++++++++++++++++++++++++++++++++
>  6 files changed, 278 insertions(+)
> ---
> base-commit: 24c4d4041c2ec11c47baf6ea54f9379cf88809fc
> change-id: 20250415-topic-am62-dt-partialio-v6-15-327dd1ff17da
> prerequisite-change-id: 20241009-topic-mcan-wakeup-source-v6-12-8c1d69931bd8:v10
> prerequisite-patch-id: 40ff771d13dccae91c04ab120aa1b5e406b66e47
> prerequisite-patch-id: 830b339ea452edd750b04f719da91e721be630cb
> prerequisite-patch-id: 2c9142d2bc47e64c49b7b8a7ca20a62a0be14870
> prerequisite-patch-id: aa64f7e9fcc3fcbb3cb871a05a07f398f3aa8231
>
> Best regards,


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