Re: [PATCH] arm64: dts: imx91-11x11-frdm: fix CAN transceiver gpio

On Fri, Jan 16, 2026 at 3:04 PM Francesco Valla [off-list ref] wrote:

Hi Daniel,

On Fri, Jan 16, 2026 at 01:40:11PM +0200, Daniel Baluta wrote:

quoted

On Thu, Jan 15, 2026 at 8:25 PM Francesco Valla [off-list ref] wrote:

quoted

According to the HW schematic, the CAN transceiver does not have an
enable pin but a silent one. Fix the GPIO property name and polarity.

Fixes: b4bf5e55899e ("arm64: dts: freescale: Add FRDM-IMX91 basic support")

Just for clarification GPIO 23 is connected to a pin named CAN_STBY.
So I wonder if it isn't
better to use standby-gpios instead of silent-gpios?

I am looking at FRDM-IMX91 schematic file SPF-94610_A1.pdf.

But on the other hand we have

static const struct can_transceiver_data tja1051_drvdata = {
»       .flags = CAN_TRANSCEIVER_SILENT_PRESENT | CAN_TRANSCEIVER_EN_PRESENT,
};

So TJA1051 is not advertised as having a stdby flag.

Regardless of the name of the net, the functionality of a standby vs a
silent pin is very different. In this case, since the TJA1051 is
including a silent pin (pin S in he datasheet [0]), I think it's better
to declare it that way.

In case someone adds the support for a phy-oriented listen-only mode
(which is something I am thinking), this wouldn't break the integartion.

Makes sense.

Acked-by: Daniel Baluta <daniel.baluta@nxp.com>