Re: [PATCH 4/4] riscv: dts: spacemit: enable SPI0 on K3 CoM260-IFX

From: Yixun Lan <dlan@kernel.org>
To: Zhengyu He <hezhy472013@gmail.com>
Cc: Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Paul Walmsley <pjw@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Alexandre Ghiti <alex@ghiti.fr>, Mark Brown <broonie@kernel.org>,
	Alex Elder <elder@kernel.org>,
	devicetree@vger.kernel.org, linux-riscv@lists.infradead.org,
	spacemit@lists.linux.dev, linux-kernel@vger.kernel.org,
	linux-spi@vger.kernel.org, wefu@redhat.com,
	Cody Kang <cody.kang.hk@outlook.com>
Subject: Re: [PATCH 4/4] riscv: dts: spacemit: enable SPI0 on K3 CoM260-IFX
Date: Sat, 25 Jul 2026 13:13:49 +0000	[thread overview]
Message-ID: <20260725131349-GKD77545@kernel.org> (raw)
In-Reply-To: <20260717-k3-com260-spi-v7-2-rc2-b4-preview-20260716-v1-4-969a1b0f783f@gmail.com>

Hi Zhengyu,

On 07:45 Fri 17 Jul     , Zhengyu He wrote:
> SPI0 is the first enabled PDMA consumer on CoM260-IFX, so enable the
> PDMA controller together with SPI0.
> 
> The board exposes SPI0 on its 40-pin header:
> 
>   pin 19: MOSI
>   pin 21: MISO
>   pin 23: SCLK
>   pin 24: CS0
> 
> Define the pinctrl state used by this header wiring, and describe the SPI
> NOR on chip select 0 for the current validation setup.
> 
> (This was tested using a Winbond W25Q64JV SPI NOR chip.)
> 
It's fine to test spi controller with an external attached NOR flash,
but doesn't make sense to enable it permanently in board dts level.

I think it's probably better to provide as an independent dtso file,
which more flexible to let user decide to enable it or not..

Anyway, I will leave out this patch for further discussion, and
only pick patch 1 & 3 for now, thanks

> Signed-off-by: Cody Kang <cody.kang.hk@outlook.com>
> Signed-off-by: Zhengyu He <hezhy472013@gmail.com>
> ---
>  arch/riscv/boot/dts/spacemit/k3-com260-ifx.dts | 13 ++++++++++++-
>  arch/riscv/boot/dts/spacemit/k3-pinctrl.dtsi   | 21 +++++++++++++++++++++
>  2 files changed, 33 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/boot/dts/spacemit/k3-com260-ifx.dts b/arch/riscv/boot/dts/spacemit/k3-com260-ifx.dts
> index 238bb03d0e9e..01a7135df864 100644
> --- a/arch/riscv/boot/dts/spacemit/k3-com260-ifx.dts
> +++ b/arch/riscv/boot/dts/spacemit/k3-com260-ifx.dts
> @@ -11,11 +11,22 @@ / {
>  	compatible = "spacemit,k3-com260-ifx", "spacemit,k3-com260", "spacemit,k3";
>  
>  	aliases {
> -		serial0 = &uart0;
>  		ethernet0 = &eth1;
> +		serial0 = &uart0;
> +		spi0 = &spi0;
>  	};
>  
>  	chosen {
>  		stdout-path = "serial0:115200n8";
>  	};
>  };
> +
> +&pdma {
> +	status = "okay";
> +};
> +
> +&spi0 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&ssp0_2_cfg>;
> +	status = "okay";
> +};

..
> diff --git a/arch/riscv/boot/dts/spacemit/k3-pinctrl.dtsi b/arch/riscv/boot/dts/spacemit/k3-pinctrl.dtsi
> index 3ee1471f3798..9b7617f3846c 100644
> --- a/arch/riscv/boot/dts/spacemit/k3-pinctrl.dtsi
> +++ b/arch/riscv/boot/dts/spacemit/k3-pinctrl.dtsi
> @@ -679,6 +679,27 @@ pwm19-2-pins {
>  		};
>  	};
>  
> +	/omit-if-no-ref/
> +	ssp0_2_cfg: ssp0-2-cfg {
> +		ssp0-0-pins {
> +			pinmux = <K3_PADCONF(104, 1)>,  /* ssp0 tx */
> +				 <K3_PADCONF(105, 1)>,  /* ssp0 rx */
> +				 <K3_PADCONF(106, 1)>;  /* ssp0 clk */
> +
> +			bias-disable;
> +			drive-strength = <25>;
> +			power-source = <1800>;
> +		};
> +
> +		ssp0-1-pins {
> +			pinmux = <K3_PADCONF(107, 1)>;  /* ssp0 frm */
> +
> +			bias-pull-up = <0>;
> +			drive-strength = <25>;
> +			power-source = <1800>;
> +		};
> +	};
> +
If you can put spi pinctrl data as a separate patch, then I'd be happy
to include, just be sure to list all spi controller pinctrl info

>  	/omit-if-no-ref/
>  	uart0_0_cfg: uart0-0-cfg {
>  		uart0-0-pins {
> 
> -- 
> 2.53.0
> 

-- 
Yixun Lan (dlan)