[PATCH 3/3] riscv: dts: spacemit: k3-deepcomputing-fml13v05: Enable SD card support

[Sandie Cao]

Hi, Troy:

> From: "Troy Mitchell"<troy.mitchell at linux.spacemit.com>
> Date:  Wed, Sep 23, 2026, 15:02
> On Wed, Sep 23, 2026 at 02:35:20PM +0800, Sandie Cao wrote:
> > FML13V05 SD card slot is inside the board, it doesn't need cd-gpio,
> > FML13V05 Keeps GPIO88 to low, Then SD card is always on for SD Card
> > driver.
> 
> An internal slot does not necessarily mean the card is non-removable.
> I don't think its location alone justifies keeping card detect asserted:
> GPIO88 would report a card present even when the slot is empty.

Yes. The FML13V05 hardware is designed for this. We can't change it. 

> 
> > We check the vmmc-supply is p3v3. We have the same SDK DTS config with
> > k3_com260[1] , so, this patch follows the SD card patch of k3_com260
> > dts[2].
> >
> > If this is not correct, we will change it.
> 
> Could you confirm from the schematics that the SD power wiring matches
> CoM260 and that the card's VDD is actually connected to ALDO4? If so,
> this supply reference is fine. The same SDK configuration alone does
> not establish the wiring.
> 
> If the card instead uses a fixed, always-on supply with no software power
> control, vmmc-supply is optional for the MMC core; it should not point to
> an unrelated ALDO4 rail.

We check the schematics both of COM260 and FML13V05, both use p3v3 (a fixed, always-on supply with no software power control), not ALDO4. ALD04 is only for USB.
We will correct it in next patch.

Best regards
Sandie

> 
> -- 
> Troy Mitchell
>