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drivers/mtd/w25: support custom SPI transfers delay

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This commit adds SPI_SETDELAY interface if CONFIG_SPI_DELAY_CONTROL
option is set. This allows to set custom delay between SPI transfers,
chip selects and so on.

Default values are set to 0. W25 SPI NOR flash works with them and
I haven't found any other values in the datasheet.

Signed-off-by: Michal Lenc <michallenc@seznam.cz>
This commit is contained in:
Michal Lenc
2025-11-27 10:42:15 +01:00
committed by Xiang Xiao
parent 58978490ad
commit edf3cc55a5
2 changed files with 37 additions and 0 deletions
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32
drivers/mtd/Kconfig
View File

@@ -1352,6 +1352,38 @@ config W25_SPIFREQUENCY
int "W25 SPI Frequency"
default 20000000
config W25_START_DELAY
int "W25 SPI start delay"
depends on SPI_DELAY_CONTROL
range 0 1000000
default 0
---help---
The delay between CS active and first CLK. In ns.
config W25_STOP_DELAY
int "W25 SPI stop delay"
depends on SPI_DELAY_CONTROL
range 0 1000000
default 0
---help---
The delay between last CLK and CS inactive. In ns.
config W25_CS_DELAY
int "W25 SPI chip select delay"
depends on SPI_DELAY_CONTROL
range 0 1000000
default 0
---help---
The delay between CS inactive and CS active again. In ns.
config W25_IFDELAY
int "W25 SPI frames delay"
depends on SPI_DELAY_CONTROL
range 0 1000000
default 0
---help---
The delay between consecutive frames. In ns.
config W25_READONLY
bool "W25 Read-Only FLASH"
default n

5
drivers/mtd/w25.c
View File

@@ -354,6 +354,11 @@ static void w25_lock(FAR struct spi_dev_s *spi)
SPI_SETBITS(spi, 8);
SPI_HWFEATURES(spi, 0);
SPI_SETFREQUENCY(spi, CONFIG_W25_SPIFREQUENCY);
#ifdef CONFIG_SPI_DELAY_CONTROL
SPI_SETDELAY(spi, CONFIG_W25_START_DELAY,
CONFIG_W25_STOP_DELAY, CONFIG_W25_CS_DELAY,
CONFIG_W25_IFDELAY);
#endif
}
/****************************************************************************