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

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Message-ID: <20251013113605.GA177845@legfed1>
Date: Mon, 13 Oct 2025 13:36:05 +0200
From: Dimitri Fedrau <dima.fedrau@...il.com>
To: Marc Kleine-Budde <mkl@...gutronix.de>
Cc: Dimitri Fedrau via B4 Relay <devnull+dimitri.fedrau.liebherr.com@...nel.org>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-phy@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dimitri Fedrau <dimitri.fedrau@...bherr.com>,
	linux-can@...r.kernel.org
Subject: Re: [PATCH v3 2/2] phy: add basic support for NXPs TJA1145 CAN
 transceiver

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.

Best regards,
Dimitri Fedrau