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iio: adc: stm32-dfsdm: Add support for stm32mp1 

Add support for DFSDM (Digital Filter For Sigma Delta Modulators)
to STM32MP1. This variant is close to STM32H7 DFSDM, it implements
6 filter instances. Registers map is also increased.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
hifive-unleashed-5.1
Fabrice Gasnier 2018-05-02 15:05:23 +02:00 committed by Jonathan Cameron
parent cbf73ae59b
commit e2fad74503
2 changed files with 26 additions and 2 deletions
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7
Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.txt
View File

@ -8,14 +8,16 @@ It is mainly targeted for:
- PDM microphones (audio digital microphone)
It features up to 8 serial digital interfaces (SPI or Manchester) and
up to 4 filters on stm32h7.
up to 4 filters on stm32h7 or 6 filters on stm32mp1.
Each child node match with a filter instance.
Contents of a STM32 DFSDM root node:
------------------------------------
Required properties:
- compatible: Should be "st,stm32h7-dfsdm".
- compatible: Should be one of:
"st,stm32h7-dfsdm"
"st,stm32mp1-dfsdm"
- reg: Offset and length of the DFSDM block register set.
- clocks: IP and serial interfaces clocking. Should be set according
to rcc clock ID and "clock-names".
@ -45,6 +47,7 @@ Required properties:
"st,stm32-dfsdm-adc" for sigma delta ADCs
"st,stm32-dfsdm-dmic" for audio digital microphone.
- reg: Specifies the DFSDM filter instance used.
Valid values are from 0 to 3 on stm32h7, 0 to 5 on stm32mp1.
- interrupts: IRQ lines connected to each DFSDM filter instance.
- st,adc-channels: List of single-ended channels muxed for this ADC.
valid values:

21
drivers/iio/adc/stm32-dfsdm-core.c
View File

@ -25,6 +25,8 @@ struct stm32_dfsdm_dev_data {
#define STM32H7_DFSDM_NUM_FILTERS 4
#define STM32H7_DFSDM_NUM_CHANNELS 8
#define STM32MP1_DFSDM_NUM_FILTERS 6
#define STM32MP1_DFSDM_NUM_CHANNELS 8
static bool stm32_dfsdm_volatile_reg(struct device *dev, unsigned int reg)
{
@ -61,6 +63,21 @@ static const struct stm32_dfsdm_dev_data stm32h7_dfsdm_data = {
.regmap_cfg = &stm32h7_dfsdm_regmap_cfg,
};
static const struct regmap_config stm32mp1_dfsdm_regmap_cfg = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = sizeof(u32),
.max_register = 0x7fc,
.volatile_reg = stm32_dfsdm_volatile_reg,
.fast_io = true,
};
static const struct stm32_dfsdm_dev_data stm32mp1_dfsdm_data = {
.num_filters = STM32MP1_DFSDM_NUM_FILTERS,
.num_channels = STM32MP1_DFSDM_NUM_CHANNELS,
.regmap_cfg = &stm32mp1_dfsdm_regmap_cfg,
};
struct dfsdm_priv {
struct platform_device *pdev; /* platform device */
@ -248,6 +265,10 @@ static const struct of_device_id stm32_dfsdm_of_match[] = {
.compatible = "st,stm32h7-dfsdm",
.data = &stm32h7_dfsdm_data,
},
{
.compatible = "st,stm32mp1-dfsdm",
.data = &stm32mp1_dfsdm_data,
},
{}
};
MODULE_DEVICE_TABLE(of, stm32_dfsdm_of_match);