[PATCH] arm64: dts: allwinner: a523: fix SD card detect pull resistor

[Chen-Yu Tsai]

On Fri, Apr 25, 2025 at 8:35 AM Andre Przywara <andre.przywara at arm.com> wrote:
>
> Trying to use the SD card on the Radxa board revealed that the card
> detect wouldn't work as expected (insert not detected). Looking at the
> schematic shows that the pull-up resistor is actually not populated
> ("NC"), and the transistor just pulls the GPIO pin to GND, but it's
> floating otherwise.
> So using the pull-down flag is definitely wrong, we need the internal
> pull up to get a reliable signal. The same is true for the Avaota board
> (there is no transistor there, but it's floating in the same way). There
> is no schematic for the X96QPro+ board, but experiments show it's the
> same behaviour.
>
> So change the GPIO flag for the card detect GPIO property to activate
> the pull-up resistor for that pin.
>
> Fixes: 80e0fb4e491b ("arm64: dts: allwinner: a523: add Radxa A5E support")
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> ---
> Hi,
>
> please let me know if I should split this up into 3 patches, with proper
> Fixes: tags, or if you can maybe squash this into the original commits
> still?

I can squash them in if you prefer.

ChenYu

> Cheers,
> Andre
>
>  arch/arm64/boot/dts/allwinner/sun55i-a527-radxa-a5e.dts | 2 +-
>  arch/arm64/boot/dts/allwinner/sun55i-h728-x96qpro+.dts  | 2 +-
>  arch/arm64/boot/dts/allwinner/sun55i-t527-avaota-a1.dts | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/allwinner/sun55i-a527-radxa-a5e.dts b/arch/arm64/boot/dts/allwinner/sun55i-a527-radxa-a5e.dts
> index 03c9a9ef5adc2..2d2f3af91d05e 100644
> --- a/arch/arm64/boot/dts/allwinner/sun55i-a527-radxa-a5e.dts
> +++ b/arch/arm64/boot/dts/allwinner/sun55i-a527-radxa-a5e.dts
> @@ -56,7 +56,7 @@ &ehci1 {
>
>  &mmc0 {
>         vmmc-supply = <&reg_cldo3>;
> -       cd-gpios = <&pio 5 6 (GPIO_ACTIVE_LOW | GPIO_PULL_DOWN)>; /* PF6 */
> +       cd-gpios = <&pio 5 6 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>; /* PF6 */
>         bus-width = <4>;
>         status = "okay";
>  };
> diff --git a/arch/arm64/boot/dts/allwinner/sun55i-h728-x96qpro+.dts b/arch/arm64/boot/dts/allwinner/sun55i-h728-x96qpro+.dts
> index c0bce3f4fa925..59db103546f65 100644
> --- a/arch/arm64/boot/dts/allwinner/sun55i-h728-x96qpro+.dts
> +++ b/arch/arm64/boot/dts/allwinner/sun55i-h728-x96qpro+.dts
> @@ -56,7 +56,7 @@ &ehci1 {
>
>  &mmc0 {
>         vmmc-supply = <&reg_vcc3v3>;
> -       cd-gpios = <&pio 5 6 (GPIO_ACTIVE_LOW | GPIO_PULL_DOWN)>; /* PF6 */
> +       cd-gpios = <&pio 5 6 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>; /* PF6 */
>         bus-width = <4>;
>         disable-wp;
>         status = "okay";
> diff --git a/arch/arm64/boot/dts/allwinner/sun55i-t527-avaota-a1.dts b/arch/arm64/boot/dts/allwinner/sun55i-t527-avaota-a1.dts
> index 85a546aecdbe1..dea2acc1849bb 100644
> --- a/arch/arm64/boot/dts/allwinner/sun55i-t527-avaota-a1.dts
> +++ b/arch/arm64/boot/dts/allwinner/sun55i-t527-avaota-a1.dts
> @@ -66,7 +66,7 @@ &ehci1 {
>
>  &mmc0 {
>         vmmc-supply = <&reg_cldo3>;
> -       cd-gpios = <&pio 5 6 (GPIO_ACTIVE_LOW | GPIO_PULL_DOWN)>; /* PF6 */
> +       cd-gpios = <&pio 5 6 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>; /* PF6 */
>         bus-width = <4>;
>         status = "okay";
>  };
>
> base-commit: 1e5a69d67d1b3c55c9b0cd3933af1436b5d52aa1
> --
> 2.46.3
>