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Wed, 23 Sep 2026 09:57:13 +0000 From: Changhuang Liang To: Mark Brown Cc: Serge Semin , linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, Changhuang Liang Subject: [PATCH v1 0/2] Add enhance SPI DMA support for JHB100 SFC Date: Wed, 23 Sep 2026 02:57:03 -0700 Message-Id: <20260923095705.233297-1-changhuang.liang@starfivetech.com> X-Mailer: git-send-email 2.25.1 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: ZQ0PR01CA0032.CHNPR01.prod.partner.outlook.cn (2406:e500:c550:2::6) To ZQ4PR01MB1202.CHNPR01.prod.partner.outlook.cn (2406:e500:c550:17::6) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: ZQ4PR01MB1202:EE_|ZQ4PR01MB1219:EE_ X-MS-Office365-Filtering-Correlation-Id: 9ae0d63a-2320-42f5-0db4-08df19590a7b X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0;ARA:13230040|52116014|376014|23010399003|366016|1800799024|38350700014|56012099006|10067099003|18002099003; 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In flash access scenarios, it operates in half-duplex mode, so we can request this DMA channel for the direction that transfers a larger amount of data. Different transfer directions need to share a single DMA channel in a time-multiplexed manner. Therefore, it is necessary to request the DMA channel at runtime based on the current transfer direction, and release the DMA channel after use. This series has already been tested on the JHB100 EVB1. Changhuang Liang (2): spi: dw: Request DMA channels at runtime instead of probe spi: dw: Add DMA support for enhanced memory operations drivers/spi/spi-dw-core.c | 154 ++++++++++++++------ drivers/spi/spi-dw-dma.c | 289 +++++++++++++++++++++++++++++++++++++- drivers/spi/spi-dw-mmio.c | 2 + drivers/spi/spi-dw.h | 10 ++ 4 files changed, 404 insertions(+), 51 deletions(-) -- 2.25.1