[PATCH 0/4] Support UART over MicroSD slot on Transformer T20

[Svyatoslav Ryhel]

вт, 18 бер. 2025 р. о 10:31 Artur Kowalski <arturkow2000 at gmail.com> пише:
>
>
> The first patch in the series brings general pinmux support for exposing
> UART over SDB/SDD pins on T20. The following patches bring support
> Transformer T20 allowing to enable UART over uSD by setting
>
> CONFIG_TEGRA_ENABLE_UARTA=y
> CONFIG_DEVICE_TREE_INCLUDES="tegra20-asus-transformer-uart-usd.dtsi"
>
> Similarily, support for UART over uSD could be brought to Ventana which
> has uSD on the same pins as TF101, and other Ventana-based boards.
>

Hey there, thank you for looking into U-Boot for Tegra. If something I
will say hurts or offends you, I am sorry it was not intentional.

Anyway, apart funcmux changes, all other changes you propose are
redundant. Asus dedicated uart for logging and console is UARTD any
other uart configuration must not be added since it will disrupt
existing configuration. If you need uart and cannot resolve an issue
without it you can always solder to uart-d or locally mux sd to uart
console fix your issue and remove it. Uart is not intended way to
interact with Asus TF101 and doesn't need to be exposed, panel and
fastboot console are and can be used to resolve most of issues.

Best regards,
Svyatoslav R.

>
> Artur Kowalski (4):
>   tegra: add funcmux for exposing UART over uSD slot on Tegra 20
>   tegra: respect CONFIG_TEGRA_ENABLE_UART* options on Transformer T20
>   ARM: tegra: expose UART-A over uSD on Transformer T20
>   board: asus: transformer: add DTSI file for enabling UART over uSD
>     slot
>
>  .../tegra20-asus-transformer-uart-usd.dtsi    | 31 +++++++++++++++++++
>  arch/arm/include/asm/arch-tegra20/funcmux.h   |  1 +
>  arch/arm/mach-tegra/board.c                   |  4 ++-
>  arch/arm/mach-tegra/tegra20/Kconfig           |  4 +++
>  drivers/pinctrl/tegra/funcmux-tegra20.c       |  9 +++++-
>  include/configs/transformer-t20.h             | 10 ++++++
>  6 files changed, 57 insertions(+), 2 deletions(-)
>  create mode 100644 arch/arm/dts/tegra20-asus-transformer-uart-usd.dtsi
>
> --
> 2.48.1
>