Re: [alsa-devel] [PATCH 2/7] MFD: add STM32 DFSDM support

On Mon, 23 Jan 2017, Arnaud Pouliquen wrote:

DFSDM hardware IP can be used at the same time for ADC sigma delta

Same time as what?

conversion and audio PDM microphone. MFD driver is in charge of configuring IP registers and managing IP clocks. For this it exports an API to handles filters and channels resources.

This looks like an ADC driver? What is it that makes it an MFD?

Signed-off-by: Arnaud Pouliquen arnaud.pouliquen@st.com

drivers/mfd/Kconfig | 11 + drivers/mfd/Makefile | 2 + drivers/mfd/stm32-dfsdm-reg.h | 220 +++++++++ drivers/mfd/stm32-dfsdm.c | 1044 +++++++++++++++++++++++++++++++++++++++ include/linux/mfd/stm32-dfsdm.h | 324 ++++++++++++ 5 files changed, 1601 insertions(+) create mode 100644 drivers/mfd/stm32-dfsdm-reg.h create mode 100644 drivers/mfd/stm32-dfsdm.c create mode 100644 include/linux/mfd/stm32-dfsdm.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index c6df644..4bb660b 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1607,6 +1607,17 @@ config MFD_STW481X in various ST Microelectronics and ST-Ericsson embedded Nomadik series.

+config MFD_STM32_DFSDM

• tristate "ST Microelectronics STM32 DFSDM"
• depends on (ARCH_STM32 && OF) || COMPILE_TEST
• select MFD_CORE
• select REGMAP
• select REGMAP_MMIO
• help

•  Select this option to enable the STM32 Digital Filter
  

•  for Sigma Delta Modulators (DFSDM) driver used
  

•  in various STM32 series.
  

menu "Multimedia Capabilities Port drivers" depends on ARCH_SA1100

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