Re: [PATCH v2 1/2] arm64: dts: amlogic: meson-sm1-odroid-hc4: mux the SPI NOR HOLD# and WP# pins

[Neil Armstrong <neil.armstrong@linaro.org>]

On 10/2/26 20:36, Igor Velkov via B4 Relay wrote:
> From: Igor Velkov <iav@iav.lv>
> 
> The SPI NOR flash uses six lines, but nor_pins covers only four: data,
> clock and chip select. Nothing claims HOLD# (BOOT_3) and WP# (BOOT_7),
> so they keep the boot ROM setting. After a boot from SPI they are in
> the nor function and the flash works. After a boot from SD with the
> button under the board, they stay eMMC data lines pulled low, and
> spi-nor reports "unrecognized JEDEC id bytes: 00 00 00 00 00 00".
> 
> Add them as a separate group in meson-g12-common.dtsi rather than to
> nor_pins: whether HOLD# and WP# reach the SoC depends on the board. The
> HC4 has eMMC disabled and takes both groups.
> 
> Tested on ODROID-HC4: with BOOT_3 and BOOT_7 set back to eMMC with
> pull-down and spifc rebound, the flash fails as above without this
> patch and probes as a 16 MiB mtd0 with it.
> 
> Fixes: 7178f340e929 ("arm64: dts: meson-sm1-odroid-hc4: add spifc node to ODROID-HC4")
> Assisted-by: LLM
> Signed-off-by: Igor Velkov <iav@iav.lv>
> ---
>   arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi    | 9 +++++++++
>   arch/arm64/boot/dts/amlogic/meson-sm1-odroid-hc4.dts | 2 +-
>   2 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
> index 00609d2da674..3135566df880 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
> @@ -615,6 +615,15 @@ mux {
>   						};
>   					};
>   
> +					nor_hold_wp_pins: nor-hold-wp {
> +						mux {
> +							groups = "nor_hold",
> +							       "nor_wp";
> +							function = "nor";
> +							bias-disable;
> +						};
> +					};
> +
>   					pdm_din0_a_pins: pdm-din0-a {
>   						mux {
>   							groups = "pdm_din0_a";
> diff --git a/arch/arm64/boot/dts/amlogic/meson-sm1-odroid-hc4.dts b/arch/arm64/boot/dts/amlogic/meson-sm1-odroid-hc4.dts
> index 3ece30a0a1ff..c4b93d6619f2 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-sm1-odroid-hc4.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-sm1-odroid-hc4.dts
> @@ -126,7 +126,7 @@ &sd_emmc_c {
>   
>   &spifc {
>   	status = "okay";
> -	pinctrl-0 = <&nor_pins>;
> +	pinctrl-0 = <&nor_pins>, <&nor_hold_wp_pins>;
>   	pinctrl-names = "default";
>   
>   	flash@0 {
> 

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>

Thanks,
Neil

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