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[75.72.117.212]) by smtp.gmail.com with ESMTPSA id 8926c6da1cb9f-53d3e3373f6sm1110059173.29.2025.09.18.09.22.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 18 Sep 2025 09:22:24 -0700 (PDT) Message-ID: Date: Thu, 18 Sep 2025 11:22:23 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/3] riscv: dts: spacemit: define a SPI controller node To: Yao Zi , Yixun Lan Cc: broonie@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, linux-spi@vger.kernel.org, devicetree@vger.kernel.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, p.zabel@pengutronix.de, spacemit@lists.linux.dev, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org References: <20250917220724.288127-1-elder@riscstar.com> <20250917220724.288127-4-elder@riscstar.com> <20250918133209-GYB1273705@gentoo.org> Content-Language: en-US From: Alex Elder In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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