[PATCH v3 2/2] phy: add basic support for NXPs TJA1145 CAN transceiver

[Marc Kleine-Budde]

On 13.10.2025 13:36:05, Dimitri Fedrau wrote:
> Am Mon, Oct 13, 2025 at 11:51:51AM +0200 schrieb Marc Kleine-Budde:
> > On 13.10.2025 11:19:19, Dimitri Fedrau via B4 Relay wrote:
> > > 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.
> 
> > 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 at pengutronix.de>

regards,
Marc

-- 
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