Re: [PATCH 2/2] riscv: dts: spacemit: k3: Add PCIe device node

[Inochi Amaoto <inochiama@gmail.com>]

On Mon, Jul 13, 2026 at 10:04:09AM -0500, Anirudh Srinivasan wrote:
> Hi Inochi,
> 
> On Sun, Jul 12, 2026 at 11:19 PM Inochi Amaoto <inochiama@gmail.com> wrote:
> >
> > On Sun, Jul 12, 2026 at 11:13:07PM -0500, Anirudh Srinivasan wrote:
> > > Hi Inochi,
> > >
> > > On Thu, Jul 09, 2026 at 12:04:14PM +0800, Inochi Amaoto wrote:
> > > > Add all PCIe device node for Spacemit K3.
> > > >
> > > > Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
> > > > ---
> > > >  arch/riscv/boot/dts/spacemit/k3-pico-itx.dts |  38 ++++
> > > >  arch/riscv/boot/dts/spacemit/k3-pinctrl.dtsi |  33 ++++
> > > >  arch/riscv/boot/dts/spacemit/k3.dtsi         | 195 +++++++++++++++++++
> > > >  3 files changed, 266 insertions(+)
> > > >
> > >
> > > I see some warnings printed during probe
> > >
> > > [   10.842955] r8169 0002:01:00.0: of_irq_parse_pci: failed with rc=-22
> > >
> > > [   10.937754] rtw89_8852be 0004:01:00.0: of_irq_parse_pci: failed with rc=-22
> > >
> >
> > This is an expected error because the driver does not support INTx
> > but the hardware claims it supports. Since the vendor does not want
> > to support it, so there is no way for the upstreamer to add this.
> 
> Are you saying that the hardware advertises support for INTx, but
> spacemit hasn't provided a driver that uses it?
> 
> Is there a way to let the driver know to not try setting up legacy
> interrupts then? It seems like it's trying to do that now, and failing
> to find interrupts node in the DT.
> 

IIRC it is hard to do this, this is more like a quirk for the spacemit
PCIe controllers.

Regards,
Inochi

> >
> > > I see that all the 3 rc nodes are missing an interrupts node and an
> > > interrupt parent (saplic). The vendor DT seems to have this. Not sure if
> > > this is related.
> > >
> > > The 10G ethernet probes fine, but the wifi card fails to probe. Seems
> > > like the card is trying to request 32 bit DMA addresses and we're
> > > failing cause we have 64 bit memory only.
> > > The vendor kernel seems to have a patch to enable 36 bit DMA in
> > > the rtw89 driver. That'll probably fix this.
> > >
> >
> > This warning is also found on my test, it is not related to
> > the PCIe driver, but a lack of the RTL phy driver. :(
> >
> > You may also noticed a bad performance on this 10G ethernet,
> > it is caused by the single queue used by the RTL driver.
> > IIRC, even 9800 X3D can not achieve the max speed.
> 
> I don't have the ability to test the 10G NIC unfortunately :(
> 
> Regards
> Anirudh Srinivasan
> 
> >
> > Regards,
> > Inochi
> >