[PATCH 0/2] Attempt to enable MMC on SpacemiT K1 boards

[Michael Opdenacker]

The following commits are trying to enable MMC support on the OrangePi RV2
and BananaPi F3 boards.

This is partially supported. On both boards, partitions are
recognized and a filesystem can be read until a certain point.

However, after attempting to read a partition via dd to /dev/null,
this error is shown:

[ 503.868650] Disabling IRQ #21

IRQ #21 was indeed the IRQ for mmc (from /proc/interrupts):

     CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
 21: 390 0 0 0 0 0 0 0 SiFive PLIC 99 Edge mmc1

This "Disabling IRQ" message comes from kernel/irq/spurious.c,
meaning that the IRQ was spurious, i.e. not handled by the driver.

This is confirmed by the number of interrupts:

     CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
 21: 100391 0 0 0 0 0 0 0 SiFive PLIC 99 Edge mmc1

What could be wrong? Are the pin configurations correct?
My understanding of MMC/SD and of the K1 SoC is very limited.

Signed-off-by: Michael Opdenacker <michael.opdenacker at rootcommit.com>
---
Michael Opdenacker (2):
      riscv: dts: spacemit: Add i2c buses on OrangePi RV2
      riscv: dts: spacemit: Add MMC support on BPI-F3 and OrangePi RV2

 arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts  |  12 ++
 arch/riscv/boot/dts/spacemit/k1-orangepi-rv2.dts | 176 +++++++++++++++++++++++
 arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi     |  13 ++
 arch/riscv/boot/dts/spacemit/k1.dtsi             |  10 ++
 4 files changed, 211 insertions(+)
---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251215-k1-boards-add-mmc-843c7d9e5822

Best regards,
-- 
Michael Opdenacker <michael.opdenacker at rootcommit.com>