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Thu, 1 Oct 2026 16:57:34 +0200 From: Olivier Moysan To: Jonathan Cameron , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , Rob Herring , "Krzysztof Kozlowski" , Conor Dooley , "Maxime Coquelin" , Alexandre Torgue , Olivier Moysan CC: , , , , Subject: [PATCH 1/3] dt-bindings: iio: adc: add bindings for stm32 mdf filter Date: Thu, 1 Oct 2026 16:56:45 +0200 Message-ID: <20261001145702.2628429-2-olivier.moysan@foss.st.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261001145702.2628429-1-olivier.moysan@foss.st.com> References: <20261001145702.2628429-1-olivier.moysan@foss.st.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.48.87.64] X-ClientProxiedBy: ENXCAS1NODE2.st.com (10.75.128.138) To STKDAG1NODE2.st.com (10.75.128.133) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: ZR1PEPF0000E461:EE_|DBAPR10MB4011:EE_ X-MS-Office365-Filtering-Correlation-Id: 83dc4752-4c80-473f-cd27-08df1fcc53e6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|23010399003|7416014|376014|1800799024|82310400026|18002099003|22082099003|13003099007|921020|6133799003|3023799007|10067099003|56012099006|11063799006; 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Signed-off-by: Olivier Moysan --- .../bindings/iio/adc/st,stm32-mdf-adc.yaml | 383 ++++++++++++++++++ 1 file changed, 383 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/adc/st,stm32-mdf-adc.yaml diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-mdf-adc.yaml b/Documentation/devicetree/bindings/iio/adc/st,stm32-mdf-adc.yaml new file mode 100644 index 000000000000..f2fbc3e150e8 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-mdf-adc.yaml @@ -0,0 +1,383 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/adc/st,stm32-mdf-adc.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: STMicroelectronics STM32 Multi-function Digital Filter (MDF) ADC + +maintainers: + - Olivier Moysan + +description: | + STM32 MDF ADC is a sigma delta analog-to-digital converter dedicated to + interface external sigma delta modulators to STM32 micro controllers. + +properties: + compatible: + enum: + - st,stm32mp25-mdf + - st,stm32mp23-mdf + + reg: + minItems: 1 + maxItems: 2 + + clocks: + maxItems: 1 + + clock-names: + description: Internal clock used for MDF digital processing. + items: + - const: ker_ck + + "#clock-cells": + enum: [0, 1] + + clock-output-names: + description: | + CCK0 and CCK1 are optional output clocks, which share the same clock frequency, + but can be gated independently to save power. + minItems: 1 + maxItems: 2 + oneOf: + - items: + - const: cck0 + - items: + - const: cck1 + - items: + - const: cck0 + - const: cck1 + + clock-frequency: + description: | + Common clock frequency (Hz) for CCK0 and CCK1 output clocks. + The frequency must be a multiple of the "ker_ck" clock frequency. + maximum: 25000000 + + "#address-cells": + const: 1 + + "#size-cells": + const: 1 + + ranges: true + + clock-ranges: true + + resets: + maxItems: 1 + + reset-names: + items: + - const: mdf + + access-controllers: + $ref: /schemas/types.yaml#/definitions/phandle-array + description: | + Phandle to the rifsc device to check access right. + + power-domains: + maxItems: 1 + + st,interleave: + description: | + List of phandles of interleaved filters. The indexes of interleaved filters must be + consecutives starting from 0 (i.e in range [0..N]). The samples from interleaved filters + are muxed in a single channel and retrieved through the device associated to the filter 0. + The filters 1..N have to be enabled, but inherit their configuration from filter 0. + $ref: /schemas/types.yaml#/definitions/phandle-array + +required: + - compatible + - reg + - ranges + - clocks + - clock-names + - clock-ranges + - "#address-cells" + - "#size-cells" + +additionalProperties: false + +patternProperties: + "^sitf@[0-9]+$": + type: object + description: Serial interface child node + + properties: + compatible: + enum: + - st,stm32mp25-sitf-mdf + + reg: + description: Specify the SITF serial interface instance + maxItems: 1 + + clocks: + description: | + Serial interface clock (optional depending on interface mode) + maxItems: 1 + + st,sitf-mode: + description: | + Select serial interface protocol + - spi: SPI mode + - lf_spi: low frequency SPI mode for low power applications + $ref: /schemas/types.yaml#/definitions/string + enum: + - spi + - lf_spi + + required: + - reg + - st,sitf-mode + + additionalProperties: false + + "^filter@[0-9]+$": + type: object + description: Digital filter path child node + + properties: + compatible: + enum: + - st,stm32mp25-mdf-dmic + - st,stm32mp25-mdf-adc + + reg: + description: Specify the MDF filter instance + maxItems: 1 + + interrupts: + maxItems: 1 + + clocks: + minItems: 1 + description: Internal clock used for MDF digital processing and control blocks. + + clock-names: + items: + - const: ker_ck + + dmas: + maxItems: 1 + + dma-names: + items: + - const: rx + + "#io-channel-cells": + const: 1 + + '#address-cells': + const: 1 + + '#size-cells': + const: 0 + + st,cic-mode: + description: | + Cascaded-integrator-comb (CIC) filter configuration + - 0: MCIC & ACIC filters in FastSinc mode + - [1-3]: MCIC & ACIC filters in Sinc mode order 1 to 3 + - [4-5]: Single CIC filter in Sinc mode order 4 to 5 + For audio purpose it is recommended to use CIC Sinc4 or Sinc5 + This property is mandatory for filter 0 or filters not used in interleave mode. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 5 + + st,delay: + description: Filter delay in samples + $ref: /schemas/types.yaml#/definitions/uint32 + maximum: 127 + + st,rs-filter-bypass: + description: Bypass RSFLT reshaping filter. + $ref: /schemas/types.yaml#/definitions/flag + + st,hpf-filter-cutoff-bp: + description: | + High Pass Filter (HPF) cut-off frequency expressed as a fraction of the PCM sampling rate. + Cut-off frequency = st,hpf-filter-cutoff-bp x Fpcm / 10000. + If this property is not defined the HPF is disabled. + enum: [625, 1250, 2500, 9500] + + st,sync: + description: + Synchronize to another filter. + Must contain the phandle of the filter providing the synchronization. + allOf: + - $ref: /schemas/types.yaml#/definitions/phandle-array + - maxItems: 1 + + st,sitf: + $ref: /schemas/types.yaml#/definitions/phandle-array + items: + - items: + - description: Phandle of the serial interface connected to the digital filter + - description: | + The phandle's argument selects the bitstream on the falling or rising edge + of the serial interface clock: + - 0: rising edge + - 1: falling edge + enum: [0, 1] + default: 0 + description: + Should be phandle/bitstream pair. + + required: + - compatible + - reg + - interrupts + - dmas + - dma-names + - "#io-channel-cells" + - "#address-cells" + - "#size-cells" + - st,sitf + + unevaluatedProperties: false + + patternProperties: + "^channel@([0-7])$": + type: object + $ref: adc.yaml + description: Represents the external channel which is connected to the MDF. + + properties: + reg: + maximum: 7 + + io-backends: + description: + Used to pipe external sigma delta modulator or internal ADC backend to MDF + channel. + maxItems: 1 + + required: + - reg + + unevaluatedProperties: false + + allOf: + - if: + properties: + compatible: + contains: + const: st,stm32mp25-mdf-adc + + then: + patternProperties: + "^channel@[0-7]$": + required: + - io-backends + + - if: + properties: + compatible: + contains: + const: st,stm32mp25-mdf-dmic + + then: + patternProperties: + "^mdf-dai+$": + type: object + description: child node + + properties: + compatible: + enum: + - st,stm32mp25-mdf-dai + + "#sound-dai-cells": + const: 0 + + io-channels: + description: + From common IIO binding. Used to pipe external sigma delta + modulator or internal ADC output to MDF channel. + + power-domains: + maxItems: 1 + + port: + $ref: /schemas/sound/audio-graph-port.yaml# + unevaluatedProperties: false + + required: + - compatible + - "#sound-dai-cells" + - io-channels + + additionalProperties: false + +examples: + - | + #include + #include + mdf1: mdf@504d0000 { + compatible = "st,stm32mp25-mdf"; + ranges = <0 0x504d0000 0x1000>; + reg = <0x504d0000 0x8>, <0x504d0ff0 0x10>; + #address-cells = <1>; + #size-cells = <1>; + clocks = <&rcc CK_KER_MDF1>; + clock-names = "ker_ck"; + clock-ranges; + #clock-cells = <1>; + clock-output-names = "cck0", "cck1"; + clock-frequency = <2048000>; + + sitf5: sitf@300 { + compatible = "st,stm32mp25-sitf-mdf"; + reg = <0x300 0x4>; + st,sitf-mode = "spi"; + clocks = <&mdf1 0>; + }; + + filter0: filter@84 { + compatible = "st,stm32mp25-mdf-dmic"; + reg = <0x84 0x70>; + #io-channel-cells = <1>; + interrupts = ; + dmas = <&hpdma 63 0x63 0x12 0>; + dma-names = "rx"; + st,cic-mode = <5>; + st,sitf = <&sitf5 0>; + #address-cells = <1>; + #size-cells = <0>; + + channel@0 { + reg = <0>; + }; + + asoc_pdm0: mdf-dai { + compatible = "st,stm32mp25-mdf-dai"; + #sound-dai-cells = <0>; + io-channels = <&filter0 0>; + }; + }; + + filter1: filter@104 { + compatible = "st,stm32mp25-mdf-adc"; + reg = <0x104 0x70>; + #io-channel-cells = <1>; + interrupts = ; + dmas = <&hpdma 64 0x63 0x12 0>; + dma-names = "rx"; + st,cic-mode = <2>; + st,sitf = <&sitf5 1>; + #address-cells = <1>; + #size-cells = <0>; + + channel@1 { + reg = <1>; + settling-time-us = <1000>; + io-backends = <&sd_adc1>; + }; + }; + }; + +... -- 2.43.0