[PATCH v2 0/4] amlogic: t7: give the MMC bus pipeline clock real consumers

[Ulf Hansson]

On Sat, Sep 5, 2026 at 5:32 PM Lucas Tanure <tanure at linux.com> wrote:
>
> The previous series for the intermittent boot hangs on the VIM4
> marked sys_ampipe_nand as critical. But as Chuan Liu from Amlogic
> explained, sys_ampipe_nand clocks a pipeline stage that the
> hardware design inserts in the bus path between the SD/eMMC
> controllers and the NIC_MATRIX fabric to help timing closure.
>
> So the clock has real consumers: reference it from the three MMC
> controller nodes and drop CLK_IS_CRITICAL instead.
>
> The series crosses three trees; patch 4 (clk) must only land after
> patches 1-3, otherwise the DMA hangs fixed by 43e1705ecab9 come back.
>
> Changes since v1 [3]:
>  - Dropped the Fixes: tag; this series is an improvement and should not
>    be picked up by stable (Jerome Brunet)
>  - Moved the patch 4 dependency note below the --- so it is not kept
>    for posterity (Jerome Brunet)
>  - Dropped the e-mail address from the Assisted-by trailer, see
>    Documentation/process/coding-assistants.rst (Jerome Brunet)
>  - Fixed the space-indented error path added to meson_mmc_probe() in
>    patch 2, it did not pass checkpatch
>  - Dropped the CLK_PIPELINE() macro from patch 2; has_pipeline_clk is a
>    capability flag, not an SD_EMMC_CLOCK register field
>
> Thanks,
> Lucas
>
> Lucas Tanure (4):
>   dt-bindings: mmc: amlogic,meson-gx-mmc: document the T7 pipeline clock
>   mmc: meson-gx: enable the bus pipeline clock on T7
>   arm64: dts: amlogic: t7: add the pipeline clock to the MMC controllers
>   clk: meson: t7: don't mark sys_ampipe_nand as critical
>
>  .../bindings/mmc/amlogic,meson-gx-mmc.yaml    | 29 ++++++++++++++++++-
>  arch/arm64/boot/dts/amlogic/amlogic-t7.dtsi   | 15 ++++++----
>  drivers/clk/meson/t7-peripherals.c            | 10 +++----
>  drivers/mmc/host/meson-gx-mmc.c               | 20 +++++++++++++
>  4 files changed, 62 insertions(+), 12 deletions(-)
>
> --
> 2.55.0
>

Patch 1 and patch2 applied for next, thanks!

Kind regards
Uffe