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Commit e2fad745 authored by Fabrice Gasnier's avatar Fabrice Gasnier Committed by Jonathan Cameron
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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: default avatarFabrice Gasnier <fabrice.gasnier@st.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent cbf73ae5

Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.txt

+5 −2
Original line number Diff line number Diff line
@@ -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:

drivers/iio/adc/stm32-dfsdm-core.c

+21 −0
Original line number Diff line number Diff line
@@ -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);