Lines Matching +full:stm32 +full:- +full:dma +full:- +full:v2

2 # SPDX-License-Identifier: Apache-2.0
5   STM32 DMA controller (V2)
7   It is present on stm32 devices like stm32L4 or stm32WB.
8   This DMA controller includes several channels with different requests.
9   DMA clients connected to the STM32 DMA controller must use the format
10   described in the dma.txt file, using a four-cell specifier for each
11   capable of supporting 5 or 6 or 7 or 8 independent DMA channels.
12   DMA clients connected to the STM32 DMA controller must use the format
13   described in the dma.txt file, using a 3-cell specifier for each
14   channel: a phandle to the DMA controller plus the following four integer cells:
15     1. channel: the dma stream from 1 to <dma-requests>
16     2. slot: DMA periph request ID, which is written in the DMAREQ_ID of the DMAMUX_CxCR
17     this value is 0 for Memory-to-memory transfers
18     or a value between <1> .. <dma-generators> (not supported yet)
19     or a value between <dma-generators>+1  ..  <dma-generators>+<dma-requests>
20     3. channel-config: A 32bit mask specifying the DMA channel configuration
21     A name custom DMA flags for channel configuration is used
23       -bit 5 : DMA  cyclic mode config
26       -bit 6-7 : Direction (see dma.h)
31       -bit 9 : Peripheral Increment Address
34       -bit 10 : Memory Increment Address
37       -bit 11-12 : Peripheral data size
39                0x1: STM32_DMA_PERIPH_16BITS: Half-word (16 bits)
42       -bit 13-14 : Memory data size
44                0x1: STM32_DMA_MEM_16BITS: Half-word (16 bits)
47       -bit 15: Reserved
48       -bit 16-17 : Priority level
54   Example of dma usual combination for peripheral transfer
58   Example of dma node for stm32wb55x
59      dma2: dma-controller@40020400 {
60          compatible = "st,stm32-dma-v2";
62          dma-requests = <7>;
70      compatible = "st,stm32-spi";
73      dma-names = "tx", "rx";
76 compatible: "st,stm32-dma-v2"
78 include: st,stm32-dma.yaml
81   "#dma-cells":
84 # Parameter syntax of stm32 follows the dma client dts syntax
86 …nel.org/pub/scm/linux/kernel/git/devicetree/devicetree-rebasing.git/plain/Bindings/dma/st,stm32-dm…
88 dma-cells:
89   - channel
90   - slot
91   - channel-config