style(pm_wakeup_sources): reword CAN wakeup section

Reword CAN wakeup section to be more readable for users. Remove UART from
section name since CAN is the wakeup source and CAN UART is the bank of
pins the CAN is in.

Signed-off-by: Kendall Willis <k-willis@ti.com>

Author: kwillis01

source/linux/Foundational_Components/Power_Management/pm_wakeup_sources.rst

@@ -27,7 +27,7 @@ valid for given low power modes:
    +------------------------------------------------+------------+----------+-------------+
    | MCU IPC (for MCU Only mode)                    | No         | Yes      | No          |
    +------------------------------------------------+------------+----------+-------------+
-   | CAN UART I/O Daisy Chain                       | Yes        | Yes      | Yes         |
+   | CAN I/O Daisy Chain                            | Yes        | Yes      | Yes         |
    +------------------------------------------------+------------+----------+-------------+
 
 .. ifconfig:: CONFIG_part_variant in ('AM62AX', 'AM62PX')
@@ -48,7 +48,7 @@ valid for given low power modes:
    +------------------------------------------------+-------+------+---------+----------+
    | MCU IPC (for MCU Only mode)                    | No    | Yes  | No      | No       |
    +------------------------------------------------+-------+------+---------+----------+
-   | CAN UART I/O Daisy Chain                       | Yes   | Yes  | Yes     | Yes      |
+   | CAN I/O Daisy Chain                            | Yes   | Yes  | Yes     | Yes      |
    +------------------------------------------------+-------+------+---------+----------+
 
 .. ifconfig:: CONFIG_part_variant in ('AM62LX')
@@ -982,45 +982,29 @@ MCU IPC based Wakeup
 
       [IPC RPMSG ECHO] Main domain resumed due to MCU UART
 
-************************
-CAN UART I/O Daisy Chain
-************************
+
+*******************
+CAN I/O Daisy Chain
+*******************
 
 .. ifconfig:: CONFIG_part_variant in ('AM62LX')
 
-   CAN UART wakeup is not supported on AM62LX.
+   CAN wakeup is not supported on AM62LX.
 
 .. ifconfig:: CONFIG_part_variant in ('AM62X', 'AM62AX', 'AM62PX')
 
-   It is possible to wakeup the system from CAN UART pins in all supported low
-   power modes. This is possible once CAN UART is configured.
-
-   To set CAN UART as a wakeup source, a pinctrl state called "wakeup" needs to be
-   added to the device tree. The "wakeup" pinctrl state will set the  WKUP_EN flag
-   on the desired padconfig register. When the WKUP_EN flag (29th bit) is set, it
-   allows the pad to act as a wakeup source. If CAN UART has the "wakeup" pinctrl
-   state defined, then the Linux mcan driver is able to switch to the pinctrl
-   "wakeup" state during suspend which enables CAN UART wakeup.
+   CAN pins can be used to wake the system from any supported low power mode.
+   To enable this, in the device tree configure a "wakeup" pinctrl state that sets
+   the WKUP_EN flag (29th bit) on the desired padconfig register. This allows the
+   mcan driver to switch to the wakeup state during suspend.
 
-   The mcan_uart0 and mcan_uart1 nodes in
-   `k3-am62x-sk-lpm-io-ddr-wkup-sources.dtso <https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am62x-sk-lpm-io-ddr-wkup-sources.dtso?h=11.02.08>`__
-   can be used as a reference for enabling CAN UART wakeup.
+   Refer to the mcu_mcan0 and mcu_mcan1 nodes in
+   `k3-am62x-sk-lpm-wkup-sources.dtso <https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am62x-sk-lpm-wkup-sources.dtso?h=11.02.08>`__
+   for a complete example:
 
-   .. code-block:: text
+   .. code-block:: dts
 
       &mcu_pmx0 {
-           mcu_mcan0_tx_pins_default: mcu-mcan0-tx-pins-default {
-                   pinctrl-single,pins = <
-                           AM62X_IOPAD(0x034, PIN_OUTPUT, 0) /* (D6) MCU_MCAN0_TX */
-                   >;
-           };
-
-           mcu_mcan0_rx_pins_default: mcu-mcan0-rx-pins-default {
-                   pinctrl-single,pins = <
-                           AM62X_IOPAD(0x038, PIN_INPUT, 0) /* (B3) MCU_MCAN0_RX */
-                   >;
-           };
-
            mcu_mcan0_rx_pins_wakeup: mcu-mcan0-rx-pins-wakeup {
                    pinctrl-single,pins = <
                            AM62X_IOPAD(0x038, PIN_INPUT | WKUP_EN, 0) /* (B3) MCU_MCAN0_RX */