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dts: bindings: dma add support for controller

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This patch introduces the periph to/from memory dma transfer
define new values for dma cells on client side

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2020-01-23 10:17:00 +01:00 • committed by Kumar Gala
commit b7a3e7dc31
2 changed files with 8 additions and 0 deletions
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5
dts/bindings/dma/st,stm32-dma.yaml
View file

@ -24,6 +24,11 @@ properties:
# Parameter syntax of stm32 follows the dma client dts syntax # Parameter syntax of stm32 follows the dma client dts syntax
# in the Linux kernel declared in # in the Linux kernel declared in
# https://git.kernel.org/pub/scm/linux/kernel/git/devicetree/devicetree-rebasing.git/plain/Bindings/dma/stm32-dma.txt # https://git.kernel.org/pub/scm/linux/kernel/git/devicetree/devicetree-rebasing.git/plain/Bindings/dma/stm32-dma.txt
#
# channel: DMA channel
# slot: DMA stream of the DMA channel for DMA V1 or for DMA V2 with MUX peripheral request else NA
# channel-config: configuration of the selected DMA channel
# features: fifo threshold if relevant for DMA V1 or TBD for DMA V2
dma-cells: dma-cells:
- channel - channel

3
include/dt-bindings/dma/stm32_dma.h
View file

@ -4,8 +4,11 @@
* SPDX-License-Identifier: Apache-2.0 * SPDX-License-Identifier: Apache-2.0
*/ */
/* macros for channel-config */ /* macros for channel-config */
#define STM32_DMA_CONFIG_DIRECTION(config) (config & 0x3 << 6)
#define STM32_DMA_CONFIG_PERIPH_ADDR_INC(config) (config & 0x1 << 9) #define STM32_DMA_CONFIG_PERIPH_ADDR_INC(config) (config & 0x1 << 9)
#define STM32_DMA_CONFIG_MEM_ADDR_INC(config) (config & 0x1 << 10) #define STM32_DMA_CONFIG_MEM_ADDR_INC(config) (config & 0x1 << 10)
#define STM32_DMA_CONFIG_PERIPH_DATA_SIZE(config) (config & (0x3 << 11))
#define STM32_DMA_CONFIG_MEM_DATA_SIZE(config) (config & (0x3 << 13))
#define STM32_DMA_CONFIG_PERIPH_INC_FIXED(config) (config & 0x1 << 15) #define STM32_DMA_CONFIG_PERIPH_INC_FIXED(config) (config & 0x1 << 15)
#define STM32_DMA_CONFIG_PRIORITY(config) ((config >> 16) & 0x3) #define STM32_DMA_CONFIG_PRIORITY(config) ((config >> 16) & 0x3)