linux-kernel - Re: [PATCH v2 5/5] riscv: dts: microchip: add a device tree for Discovery Kit

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Message-ID: <aLarlSG9tDA-1YiL@pie>
Date: Tue, 2 Sep 2025 08:32:36 +0000
From: Yao Zi <ziyao@...root.org>
To: Valentina Fernandez <valentina.fernandezalanis@...rochip.com>,
	<conor.dooley@...rochip.com>, <daire.mcnamara@...rochip.com>,
	<paul.walmsley@...ive.com>, <palmer@...belt.com>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <aou@...s.berkeley.edu>, <alex@...ti.fr>
Cc: <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 5/5] riscv: dts: microchip: add a device tree for
 Discovery Kit

On Tue, Sep 02, 2025 at 08:55:48AM +0100, Valentina Fernandez wrote:
> Add a minimal device tree for the Microchip PolarFire SoC Discovery Kit.
> The Discovery Kit is a cost-optimized board based on PolarFire SoC
> MPFS095T and features:
> 
> - 1 GB DDR4x16
> - 1x Gigabit Ethernet
> - 3x UARTs
> - Raspberry Pi connector
> - mikroBus connector
> - microSD card connector
> 
> Link: https://www.microchip.com/en-us/development-tool/mpfs-disco-kit
> Signed-off-by: Valentina Fernandez <valentina.fernandezalanis@...rochip.com>
> ---
>  arch/riscv/boot/dts/microchip/Makefile        |   1 +
>  .../dts/microchip/mpfs-disco-kit-fabric.dtsi  |  58 ++++++
>  .../boot/dts/microchip/mpfs-disco-kit.dts     | 190 ++++++++++++++++++
>  3 files changed, 249 insertions(+)
>  create mode 100644 arch/riscv/boot/dts/microchip/mpfs-disco-kit-fabric.dtsi
>  create mode 100644 arch/riscv/boot/dts/microchip/mpfs-disco-kit.dts

...

> diff --git a/arch/riscv/boot/dts/microchip/mpfs-disco-kit.dts b/arch/riscv/boot/dts/microchip/mpfs-disco-kit.dts
> new file mode 100644
> index 000000000000..c068b9bb5bfd
> --- /dev/null
> +++ b/arch/riscv/boot/dts/microchip/mpfs-disco-kit.dts

...

> +&mbox {
> +	status = "okay";
> +};
> +
> +&mmc {
> +	bus-width = <4>;
> +	disable-wp;
> +	cap-sd-highspeed;
> +	cap-mmc-highspeed;
> +	sd-uhs-sdr12;
> +	sd-uhs-sdr25;
> +	sd-uhs-sdr50;
> +	sd-uhs-sdr104;

I think sd-uhs-sdr104 implies sd-uhs-sdr{12,25,50}, thus the latter
three properties could be dropped.

> +	no-1-8-v;
> +	status = "okay";
> +};

Best regards,
Yao Zi