Re: [PATCH net-next v7 3/4] net: pse-pd: realtek-pse-mcu: add I2C transport
From: Oleksij Rempel <o.rempel@pengutronix.de>
Date: 2026-07-14 08:34:34
Also in:
linux-devicetree, lkml
On Sun, Jul 12, 2026 at 07:22:49PM +0000, Jonas Jelonek wrote:
Add the I2C/SMBus transport for the Realtek PSE MCU core. It registers the MCU on an I2C bus and provides the send/recv callbacks the core uses to exchange the 12-byte frames. The MCU firmware expects one of two framings on the I2C bus, and which one is part of the compatible: '-smbus' (reads carry a leading command byte and a repeated start) or raw '-i2c' (bare block writes and reads). The match data flags the raw-I2C case; SMBus is the default because that's what the majority of devices uses. Because i2c_master_send()/i2c_master_recv() may DMA, the raw-I2C path bounces each frame through a heap buffer rather than the core's stack buffers; the SMBus path is unaffected. Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de> Thank you! -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |