linux-kernel - Re: [PATCH v2 3/3] riscv: dts: spacemit: define a SPI controller node

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Message-ID: <3fe0ffbe-b4fa-4585-b2d6-2437ade84928@riscstar.com>
Date: Mon, 22 Sep 2025 10:42:12 -0500
From: Alex Elder <elder@...cstar.com>
To: Vivian Wang <wangruikang@...as.ac.cn>, broonie@...nel.org,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org
Cc: dlan@...too.org, ziyao@...root.org, linux-spi@...r.kernel.org,
 devicetree@...r.kernel.org, paul.walmsley@...ive.com, palmer@...belt.com,
 aou@...s.berkeley.edu, alex@...ti.fr, p.zabel@...gutronix.de,
 spacemit@...ts.linux.dev, linux-riscv@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] riscv: dts: spacemit: define a SPI controller node

On 9/19/25 9:57 PM, Vivian Wang wrote:
> On 9/19/25 23:59, Alex Elder wrote:
> 
>> [...]
>>
>> diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi b/arch/riscv/boot/dts/spacemit/k1.dtsi
>> index 6cdcd80a7c83b..f8c37d16968e4 100644
>> --- a/arch/riscv/boot/dts/spacemit/k1.dtsi
>> +++ b/arch/riscv/boot/dts/spacemit/k1.dtsi
>> @@ -856,6 +856,22 @@ storage-bus {
>>   			#size-cells = <2>;
>>   			dma-ranges = <0x0 0x00000000 0x0 0x00000000 0x0 0x80000000>;
>>   
>> +			spi3: spi@...1c000 {
>> +				compatible = "spacemit,k1-spi";
>> +				reg = <0x0 0xd401c000 0x0 0x30>;
>> +				#address-cells = <1>;
>> +				#size-cells = <0>;
>> +				clocks = <&syscon_apbc CLK_SSP3>,
>> +					 <&syscon_apbc CLK_SSP3_BUS>;
>> +				clock-names = "core", "bus";
>> +				resets = <&syscon_apbc RESET_SSP3>;
>> +				interrupts = <55>;
>> +				dmas = <&pdma 20>,
>> +				       <&pdma 19>;
>> +				dma-names = "rx", "tx";
>> +				status = "disabled";
>> +			};
>> +
> 
> Is storage-bus the right place for SPI? I'd have thought that SPI
> wouldn't need its own dma-ranges if it does DMA though &pdma.
> 
> I know "dram_range4" is where SpacemiT put it but I'm not sure if that
> makes sense now.

You're right.  It belongs in the dma-bus region.  I will fix that in v3.

					-Alex

> 
> Vivian "dramforever" Wang
>