On 13.10.2025 13:36:05, Dimitri Fedrau wrote:

Am Mon, Oct 13, 2025 at 11:51:51AM +0200 schrieb Marc Kleine-Budde:

quoted

On 13.10.2025 11:19:19, Dimitri Fedrau via B4 Relay wrote:

quoted

Add basic driver support for NXPs TJA1145 CAN transceiver which brings the
PHY up/down by switching to normal/standby mode using SPI commands.

The PHY supports standby and sleep mode. Does the PHY framework provide
a way to configure this?

Didn't find anything related.

quoted

Why do you put the transceiver into standby not in sleep mode?

Datasheet states:

Standby mode is the first-level power-saving mode of the TJA1145A,
featuring low current consumption. The transceiver is unable to transmit
or receive data in Standby mode, but the INH pin remains active so voltage
regulators controlled by this pin will be active.

Sleep mode is the second-level power saving mode of the TJA1145A. In Sleep
mode, the transceiver behaves as in Standby Mode with the exception that
pin INH is set to a high-ohmic state. Voltage regulators controlled by this
pin will be switched off, and the current into pin BAT will be reduced to a
minimum.

I'm assuming that the sleep state would fit into some suspend,
power-off, ... scenario, because the INH pin maybe used to control
regulators.

That makes sense, and I think it depends heavily on the use case of the
system. This can be implemented as soon as the need arises.

For the whole series:

Reviewed-by: Marc Kleine-Budde <mkl@pengutronix.de>

regards,
Marc

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