Re: [PATCH 06/10] mmc: metanoia_sdhci: Add SDHCI driver for Metanoia MT2824 SoC

["Benoît Monin" <benoit.monin@bootlin.com>]

On Friday, 2 October 2026 at 17:29:35 CEST, Tom Rini wrote:
> On Fri, Oct 02, 2026 at 03:02:24PM +0200, Benoît Monin wrote:
> 
> > Add an SDHCI driver for the DesignWare Mobile Storage Host Controller
> > (DWC MSHC) integrated in the Metanoia MT2824 SoC. It supports eMMC up to
> > HS400/HS400ES and SD cards, and implements the MMC driver model.
> > 
> > The controller is a DWC MSHC instance, but its PHY programming,
> > voltage/speed-mode handling and tuning model are silicon-specific
> > and differ from the existing DWC MSHC drivers.
> > 
> > The PHY pad drive strength, receiver select and weak-pull settings
> > depend on the card type (eMMC vs SD) and are re-applied on every ios,
> > whereas snps_sdhci.c uses fixed pad values.
> > 
> > High-speed modes force 1.8V signalling and HS400 uses an explicit PHY
> > DLL lock sequence (set_control_reg()/set_ios_post()), which snps_sdhci.c
> > does not implement.
> > 
> > Tuning relies on the generic SDHCI core tuner, whereas snps_sdhci.c uses
> > the hardware auto-tuning block.
> > 
> > Keeping a dedicated driver avoids per-variant branches in the shared
> > DWC MSHC drivers, matching how snps_sdhci.c, adi_sdhci.c and
> > cv1800b_sdhci.c are already split in U-Boot.
> > 
> > Signed-off-by: Benoît Monin <benoit.monin@bootlin.com>
> [snip]
> > +static const struct udevice_id metanoia_sdhci_ids[] = {
> > +	{ .compatible = "metanoia,mt2824-dwcmshc" },
> > +	{ /* sentinel */ }
> > +};
> 
> I don't see this compatible in Linus' tree currently, so what's the
> status on upstreaming all of the device tree parts? Thanks.
> 
We are currently preparing a first patch series for Linux, but it has not
been posted yet.

-- 
Benoît