linux-kernel - Re: [PATCH 1/1] arm64: dts: rockchip: enable onboard spi flash for rock-3a

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Message-ID: <421ab43b-ff92-41c6-9904-3c7681c926be@kwiboo.se>
Date: Mon, 8 Apr 2024 16:44:59 +0200
From: Jonas Karlman <jonas@...boo.se>
To: Chukun Pan <amadeus@....edu.cn>, Heiko Stuebner <heiko@...ech.de>
Cc: Conor Dooley <conor+dt@...nel.org>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, Rob Herring <robh@...nel.org>,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/1] arm64: dts: rockchip: enable onboard spi flash for
 rock-3a

Hi Chukun,

On 2024-04-08 14:40, Chukun Pan wrote:
> There is a mx25u12835f spi flash on this board, enable it.
> 
> [    2.525805] spi-nor spi4.0: mx25u12835f (16384 Kbytes)
> 
> Signed-off-by: Chukun Pan <amadeus@....edu.cn>
> ---
>  arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts b/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts
> index a5e974ea659e..d8738cc47c73 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts
> @@ -757,6 +757,18 @@ &sdmmc2 {
>  	status = "okay";
>  };
>  
> +&sfc {

This is missing:

	#address-cells = <1>;
	#size-cells = <0>;

> +	status = "okay";
> +
> +	flash@0 {
> +		compatible = "jedec,spi-nor";
> +		reg = <0x0>;
> +		spi-max-frequency = <50000000>;

At least in U-Boot the spi clock only support 24, 100 or 200 mhz and I
am pretty sure the spi flash support 100mhz, so I would suggest you test
with 100mhz, same as used on other rk356x boards.

For U-Boot I have used 24 mhz for rk356x boards not defining a flash@0
node in linux device tree, such as the rock-3a board.

Regards,
Jonas

> +		spi-rx-bus-width = <4>;
> +		spi-tx-bus-width = <1>;
> +	};
> +};
> +
>  &tsadc {
>  	rockchip,hw-tshut-mode = <1>;
>  	rockchip,hw-tshut-polarity = <0>;