diff options
| author | Fabrice Gasnier <fabrice.gasnier@st.com> | 2017-01-26 15:28:33 +0100 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2017-01-29 12:49:17 +0000 |
| commit | 2763ea0585c999f0bd98d67cbeadee8d872103a2 (patch) | |
| tree | 4447825df088c4ec4737046a4aff4d5519dc165d /drivers/iio/adc/Kconfig | |
| parent | 122b5f4580519b2e2563467a6dc9ac952f1d33da (diff) | |
iio: adc: stm32: add optional dma support
Add DMA optional support to STM32 ADC, as there is a limited number DMA
channels (request lines) that can be assigned to ADC. This way, driver
may fall back using interrupts when all DMA channels are in use for
other IPs.
Use dma cyclic mode with two periods. Allow to tune period length by
using watermark. Coherent memory is used for dma (max buffer size is
fixed to PAGE_SIZE).
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/adc/Kconfig')
| -rw-r--r-- | drivers/iio/adc/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 210fa116842b..dedae7adbce9 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -497,6 +497,7 @@ config ROCKCHIP_SARADC config STM32_ADC_CORE tristate "STMicroelectronics STM32 adc core" depends on ARCH_STM32 || COMPILE_TEST + depends on HAS_DMA depends on OF depends on REGULATOR select IIO_BUFFER |