Re: [PATCH v2] arm: dts: renesas: r8a7740-armadillo800eva: Enable SDHI1

[Geert Uytterhoeven]

On Tue, 24 Feb 2026 at 08:45, <phucduc.bui@xxxxxxxxx> wrote:
> From: bui duc phuc <phucduc.bui@xxxxxxxxx>
>
> The Armadillo-800EVA board provides an SD card slot and an AWL13 SDIO
> interface connected to the SDHI1 controller. Routing between these two
> interfaces is controlled by a mechanical DIP switch and a set of
> multiplexers.
>
> This patch adds:
>
>   - A fixed 3.3V regulator for SDHI1 power, controlled by PORT16 (G2).
>   - SDHI1 pinmux groups for data, control, and card detection.
>   - A gpio-hog for PORT6 (J5) to control the SDHI1/AWLAN multiplexer.
>
> PORT176 (N21) is already configured as output-high in this DTS (via
> lcd0-mux-hog), routing the SDSLOT2_ENABLE signal to PORT6. Since the
> hardware includes an external 10k pull-up resistor (R94) on this line,
> PORT6 is configured as an input to allow the physical DIP switch to
> determine the routing without SoC interference.
>
> Both configurations have been verified:
>
>   - SD card (CON8): detected as mmcblk1, high-speed SDHC.
>   - SDIO (CON14): detected as mmc1, high-speed SDIO.
>
> Signed-off-by: bui duc phuc <phucduc.bui@xxxxxxxxx>

Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
i.e. will queue in renesas-devel for v7.1.

> Note: While a specific driver for the AWL13 SDIO module may not be
> present in the current mainline kernel, the SDHI1 host successfully
> detects it as a high-speed SDIO device, confirming the hardware
> description is correct.

With SW1.5 OFF, the AWL13 SDIO module is detected as a high-speed SDIO device.
With SW1.5 ON, SD slot 2 works with SD cards (incl. card detect).

Tested-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds