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[59.124.168.89]) by smtp.gmail.com with ESMTPSA id z3sm4237179pgc.45.2022.01.14.01.17.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Jan 2022 01:17:47 -0800 (PST) From: Zong Li To: robh+dt@kernel.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, krzysztof.kozlowski@canonical.com, conor.dooley@microchip.com, geert@linux-m68k.org, bin.meng@windriver.com, green.wan@sifive.com, vkoul@kernel.org, dmaengine@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Cc: Zong Li Subject: [PATCH v3 0/3] Determine the number of DMA channels by 'dma-channels' property Date: Fri, 14 Jan 2022 17:17:38 +0800 Message-Id: X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220114_011749_991213_97275834 X-CRM114-Status: UNSURE ( 9.12 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org The PDMA driver currently assumes there are four channels by default, it might cause the error if there is actually less than four channels. Change that by getting number of channel dynamically from device tree. For backwards-compatible, it uses the default value (i.e. 4) when there is no 'dma-channels' information in dts. This patch set contains the dts and dt-bindings change. Changed in v3: - Fix allocating wrong size - Return error if 'dma-channels' is larger than maximum Changed in v2: - Rebase on tag v5.16 - Use 4 as default value of dma-channels Zong Li (3): riscv: dts: Add dma-channels property in dma node dt-bindings: Add dma-channels for pdma device node dmaengine: sf-pdma: Get number of channel by device tree .../bindings/dma/sifive,fu540-c000-pdma.yaml | 7 +++++++ .../boot/dts/microchip/microchip-mpfs.dtsi | 1 + arch/riscv/boot/dts/sifive/fu540-c000.dtsi | 1 + drivers/dma/sf-pdma/Makefile | 2 ++ drivers/dma/sf-pdma/sf-pdma.c | 20 ++++++++++++------- drivers/dma/sf-pdma/sf-pdma.h | 8 ++------ 6 files changed, 26 insertions(+), 13 deletions(-)