[PATCH 2/2] p3450: fix Jetson Nano SPI flash

[Thierry Reding]

On Tue, Aug 19, 2025 at 04:40:14PM +0100, Peter Robinson wrote:
> The Nano's SPI flash stopped working in U-Boot, as the
> prior stage loaded U-Boot, the only thing it was used
> for was save/loading env vars so update the DT so it
> can now initialise it. It also drops enabling the old
> TEGRA114_SPI driver, as the flash hangs off the faster
> TEGRA210_QSPI interface, nothing on the Nano uses the
> old interface by default so it's surplus.
> 
> Signed-off-by: Peter Robinson <pbrobinson at gmail.com>
> ---
>  arch/arm/dts/tegra210-p3450-0000.dts | 9 ++++++++-
>  arch/arm/dts/tegra210.dtsi           | 6 +++---
>  configs/p3450-0000_defconfig         | 1 -
>  3 files changed, 11 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/arm/dts/tegra210-p3450-0000.dts b/arch/arm/dts/tegra210-p3450-0000.dts
> index 9ef744ac8b0..ddeeb232de2 100644
> --- a/arch/arm/dts/tegra210-p3450-0000.dts
> +++ b/arch/arm/dts/tegra210-p3450-0000.dts
> @@ -124,7 +124,14 @@
>  
>  	spi at 70410000 {
>  		status = "okay";
> -		spi-max-frequency = <80000000>;
> +
> +		flash at 0 {
> +			compatible = "jedec,spi-nor";
> +			reg = <0>;
> +			spi-max-frequency = <104000000>;
> +			spi-tx-bus-width = <2>;
> +			spi-rx-bus-width = <2>;
> +		};
>  	};
>  
>  	usb at 7d000000 {
> diff --git a/arch/arm/dts/tegra210.dtsi b/arch/arm/dts/tegra210.dtsi
> index 28ecd2b467a..6dd8fe26c38 100644
> --- a/arch/arm/dts/tegra210.dtsi
> +++ b/arch/arm/dts/tegra210.dtsi
> @@ -762,10 +762,10 @@
>  		interrupts = <GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>;
>  		#address-cells = <1>;
>  		#size-cells = <0>;
> -		clocks = <&tegra_car TEGRA210_CLK_QSPI>;
> -		clock-names = "qspi";
> +		clocks = <&tegra_car TEGRA210_CLK_QSPI>,
> +			<&tegra_car TEGRA210_CLK_QSPI_PM>;

Nit: We usually indent so that subsequent lines align with the first, so
an extra space would be required here. I don't feel strongly about it,
though, so no need to resend just for this.

Acked-by: Thierry Reding <treding at nvidia.com>
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