Re: [PATCH v6] net: phy: air_en8811h: add AN8811HB MCU assert/deassert support

[Andrew Lunn]

On Sun, May 24, 2026 at 02:39:15PM +0800, Lucien.Jheng wrote:
> AN8811HB needs a MCU soft-reset cycle before firmware loading begins.
> Assert the MCU (hold it in reset) and immediately deassert (release)
> via a dedicated PBUS register pair (0x5cf9f8 / 0x5cf9fc), accessed
> through a registered mdio_device at PHY-addr+8.
> 
> Add __air_pbus_reg_write() as a low-level helper taking a struct
> mdio_device *, create and register the PBUS mdio_device in
> an8811hb_probe() and store it in priv->pbusdev, then implement
> an8811hb_mcu_assert() / _deassert() on top of it. Add
> an8811hb_remove() to unregister the PBUS device on teardown. Wire
> both calls into an8811hb_load_firmware() and en8811h_restart_mcu()
> so every firmware load or MCU restart on AN8811HB correctly sequences
> the reset control registers.
> 
> Fixes: 5afda1d734ed ("net: phy: air_en8811h: add Airoha AN8811HB support")
> Signed-off-by: Lucien Jheng <lucienzx159@xxxxxxxxx>

Reviewed-by: Andrew Lunn <andrew@xxxxxxx>

    Andrew