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

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Date: Mon, 8 Apr 2024 16:56:59 +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 again,

On 2024-04-08 16:44, Jonas Karlman wrote:
> 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.

Sorry, looked at spi clock instead of sfc clock.
sfc clock support 24, 50, 75, 100, 125 and 150 mhz.

Regards,
Jonas

> 
> 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>;
>