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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <c32cc8da-6703-496f-b30f-4961aa811869@riscstar.com>
Date: Thu, 18 Sep 2025 11:22:23 -0500
From: Alex Elder <elder@...cstar.com>
To: Yao Zi <ziyao@...root.org>, Yixun Lan <dlan@...too.org>
Cc: broonie@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.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 3/3] riscv: dts: spacemit: define a SPI controller node

On 9/18/25 9:33 AM, Yao Zi wrote:
>> .. em, so the SPI will use pdma, then probably you should also adjust Kconfig to
>> select PDMA driver?
> The driver seems to depend on the generic DMA engine API only, IOW,
> theoretically it should work with other DMA controller as well. And it's
> even capable to operate without DMA (see k1_spi_dma_setup()).
> 
> Dependency to PDMA really doesn't seem something should be enforced in
> Kconfig: it doesn't exist in code level, and the driver is actually more
> flexible.

You're right on both points.  The code doesn't *require* PDMA to
operate correctly (to my knowledge).

Yixun, what do you think?

					-Alex