[PATCH] dt-bindings: stm32: convert dfsdm to json-schema

* [PATCH] dt-bindings: stm32: convert dfsdm to json-schema
@ 2020-01-23  8:34 ` Olivier Moysan
  0 siblings, 0 replies; 6+ messages in thread
From: Olivier Moysan @ 2020-01-23  8:34 UTC (permalink / raw)
  To: jic23, robh+dt, olivier.moysan, lgirdwood, broonie, perex, tiwai,
	alsa-devel
  Cc: mark.rutland, mcoquelin.stm32, lars, devicetree, linux-iio,
	linux-kernel, pmeerw, knaack.h, fabrice.gasnier, linux-stm32,
	linux-arm-kernel

Convert the STM32 DFSDM bindings to DT schema format
using json-schema.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
---
The DT check still returns some warnings on this bindings:
dfsdm@4400d000: filter@4: 'st,adc-channels' is a required property
dfsdm@4400d000: filter@5: 'st,adc-channels' is a required property ...

These warnings occur because some disabled nodes do not provides the
required properties. These nodes are included from SoC DT,
and do not provides by default the properties which are board dependent.

As workaround in DFSDM yaml bindings, the properties
(like st,adc-channels) could be defined as required,
only for the nodes which are in enabled state.
---
 .../bindings/iio/adc/st,stm32-dfsdm-adc.txt   | 135 -------
 .../bindings/iio/adc/st,stm32-dfsdm-adc.yaml  | 332 ++++++++++++++++++
 2 files changed, 332 insertions(+), 135 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.txt
 create mode 100644 Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml

diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.txt b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.txt
deleted file mode 100644
index 75ba25d062e1..000000000000
--- a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.txt
+++ /dev/null
@@ -1,135 +0,0 @@
-STMicroelectronics STM32 DFSDM ADC device driver
-
-
-STM32 DFSDM ADC is a sigma delta analog-to-digital converter dedicated to
-interface external sigma delta modulators to STM32 micro controllers.
-It is mainly targeted for:
-- Sigma delta modulators (motor control, metering...)
-- PDM microphones (audio digital microphone)
-
-It features up to 8 serial digital interfaces (SPI or Manchester) and
-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 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".
-- clock-names: Input clock name "dfsdm" must be defined,
-		"audio" is optional. If defined CLKOUT is based on the audio
-		clock, else "dfsdm" is used.
-- #interrupt-cells = <1>;
-- #address-cells = <1>;
-- #size-cells = <0>;
-
-Optional properties:
-- spi-max-frequency: Requested only for SPI master mode.
-		  SPI clock OUT frequency (Hz). This clock must be set according
-		  to "clock" property. Frequency must be a multiple of the rcc
-		  clock frequency. If not, SPI CLKOUT frequency will not be
-		  accurate.
-- pinctrl-names:	Set to "default".
-- pinctrl-0:		List of phandles pointing to pin configuration
-			nodes to set pins in mode of operation for dfsdm
-			on external pin.
-
-Contents of a STM32 DFSDM child nodes:
---------------------------------------
-
-Required properties:
-- compatible: Must be:
-	"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:
-				"st,stm32h7-dfsdm" compatibility: 0 to 7.
-- st,adc-channel-names:	List of single-ended channel names.
-- st,filter-order:  SinC filter order from 0 to 5.
-			0: FastSinC
-			[1-5]: order 1 to 5.
-			For audio purpose it is recommended to use order 3 to 5.
-- #io-channel-cells = <1>: See the IIO bindings section "IIO consumers".
-
-Required properties for "st,stm32-dfsdm-adc" compatibility:
-- io-channels: From common IIO binding. Used to pipe external sigma delta
-		modulator or internal ADC output to DFSDM channel.
-		This is not required for "st,stm32-dfsdm-pdm" compatibility as
-		PDM microphone is binded in Audio DT node.
-
-Required properties for "st,stm32-dfsdm-pdm" compatibility:
-- #sound-dai-cells: Must be set to 0.
-- dma: DMA controller phandle and DMA request line associated to the
-		filter instance (specified by the field "reg")
-- dma-names: Must be "rx"
-
-Optional properties:
-- st,adc-channel-types:	Single-ended channel input type.
-			- "SPI_R": SPI with data on rising edge (default)
-			- "SPI_F": SPI with data on falling edge
-			- "MANCH_R": manchester codec, rising edge = logic 0, falling edge = logic 1
-			- "MANCH_F": manchester codec, rising edge = logic 1, falling edge = logic 0
-- st,adc-channel-clk-src: Conversion clock source.
-			  - "CLKIN": external SPI clock (CLKIN x)
-			  - "CLKOUT": internal SPI clock (CLKOUT) (default)
-			  - "CLKOUT_F": internal SPI clock divided by 2 (falling edge).
-			  - "CLKOUT_R": internal SPI clock divided by 2 (rising edge).
-
-- st,adc-alt-channel: Must be defined if two sigma delta modulator are
-			  connected on same SPI input.
-			  If not set, channel n is connected to SPI input n.
-			  If set, channel n is connected to SPI input n + 1.
-
-- st,filter0-sync: Set to 1 to synchronize with DFSDM filter instance 0.
-		   Used for multi microphones synchronization.
-
-Example of a sigma delta adc connected on DFSDM SPI port 0
-and a pdm microphone connected on DFSDM SPI port 1:
-
-	ads1202: simple_sd_adc@0 {
-		compatible = "ads1202";
-		#io-channel-cells = <1>;
-	};
-
-	dfsdm: dfsdm@40017000 {
-		compatible = "st,stm32h7-dfsdm";
-		reg = <0x40017000 0x400>;
-		clocks = <&rcc DFSDM1_CK>;
-		clock-names = "dfsdm";
-		#interrupt-cells = <1>;
-		#address-cells = <1>;
-		#size-cells = <0>;
-
-		dfsdm_adc0: filter@0 {
-			compatible = "st,stm32-dfsdm-adc";
-			#io-channel-cells = <1>;
-			reg = <0>;
-			interrupts = <110>;
-			st,adc-channels = <0>;
-			st,adc-channel-names = "sd_adc0";
-			st,adc-channel-types = "SPI_F";
-			st,adc-channel-clk-src = "CLKOUT";
-			io-channels = <&ads1202 0>;
-			st,filter-order = <3>;
-		};
-		dfsdm_pdm1: filter@1 {
-			compatible = "st,stm32-dfsdm-dmic";
-			reg = <1>;
-			interrupts = <111>;
-			dmas = <&dmamux1 102 0x400 0x00>;
-			dma-names = "rx";
-			st,adc-channels = <1>;
-			st,adc-channel-names = "dmic1";
-			st,adc-channel-types = "SPI_R";
-			st,adc-channel-clk-src = "CLKOUT";
-			st,filter-order = <5>;
-		};
-	}
diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
new file mode 100644
index 000000000000..c91407081aa5
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
@@ -0,0 +1,332 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/st,stm32-dfsdm-adc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectronics STM32 DFSDM ADC device driver
+
+maintainers:
+  - Fabrice Gasnier <fabrice.gasnier@st.com>
+  - Olivier Moysan <olivier.moysan@st.com>
+
+description: |
+  STM32 DFSDM ADC is a sigma delta analog-to-digital converter dedicated to
+  interface external sigma delta modulators to STM32 micro controllers.
+  It is mainly targeted for:
+  - Sigma delta modulators (motor control, metering...)
+  - PDM microphones (audio digital microphone)
+
+  It features up to 8 serial digital interfaces (SPI or Manchester) and
+  up to 4 filters on stm32h7 or 6 filters on stm32mp1.
+
+  Each child node matches with a filter instance.
+
+properties:
+  compatible:
+    enum:
+      - st,stm32h7-dfsdm
+      - st,stm32mp1-dfsdm
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description:
+          Internal clock used for DFSDM digital processing and control blocks.
+          dfsdm clock can also feed CLKOUT, when CLKOUT is used.
+      - description: audio clock can be used as an alternate to feed CLKOUT.
+    minItems: 1
+    maxItems: 2
+
+  clock-names:
+    items:
+      - const: dfsdm
+      - const: audio
+    minItems: 1
+    maxItems: 2
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  spi-max-frequency:
+    description:
+      SPI clock OUT frequency (Hz). Requested only for SPI master mode.
+      This clock must be set according to the "clock" property.
+      Frequency must be a multiple of the rcc clock frequency.
+      If not, SPI CLKOUT frequency will not be accurate.
+    maximum: 20000000
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - "#address-cells"
+  - "#size-cells"
+
+patternProperties:
+  "^filter@[0-9]+$":
+    type: object
+    description: child node
+
+    properties:
+      compatible:
+        enum:
+          - st,stm32-dfsdm-adc
+          - st,stm32-dfsdm-dmic
+
+      reg:
+        description: Specifies the DFSDM filter instance used.
+        maxItems: 1
+
+      interrupts:
+        maxItems: 1
+
+      st,adc-channels:
+        description: |
+          List of single-ended channels muxed for this ADC.
+          On stm32h7 and stm32mp1:
+          - For st,stm32-dfsdm-adc: up to 8 channels numbered from 0 to 7.
+          - For st,stm32-dfsdm-dmic: 1 channel numbered from 0 to 7.
+        allOf:
+          - $ref: /schemas/types.yaml#/definitions/uint32-array
+          - items:
+              minimum: 0
+              maximum: 7
+
+      st,adc-channel-names:
+        description: List of single-ended channel names.
+        allOf:
+          - $ref: /schemas/types.yaml#/definitions/string-array
+
+      st,filter-order:
+        description: |
+          SinC filter order from 0 to 5.
+          - 0: FastSinC
+          - [1-5]: order 1 to 5.
+          For audio purpose it is recommended to use order 3 to 5.
+        allOf:
+          - $ref: /schemas/types.yaml#/definitions/uint32
+          - items:
+              minimum: 0
+              maximum: 5
+
+      "#io-channel-cells":
+        const: 1
+
+      st,adc-channel-types:
+        description: |
+          Single-ended channel input type.
+          - "SPI_R": SPI with data on rising edge (default)
+          - "SPI_F": SPI with data on falling edge
+          - "MANCH_R": manchester codec, rising edge = logic 0, falling edge = logic 1
+          - "MANCH_F": manchester codec, rising edge = logic 1, falling edge = logic 0
+        items:
+          enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ]
+        allOf:
+          - $ref: /schemas/types.yaml#/definitions/non-unique-string-array
+
+      st,adc-channel-clk-src:
+        description: |
+          Conversion clock source.
+          - "CLKIN": external SPI clock (CLKIN x)
+          - "CLKOUT": internal SPI clock (CLKOUT) (default)
+          - "CLKOUT_F": internal SPI clock divided by 2 (falling edge).
+          - "CLKOUT_R": internal SPI clock divided by 2 (rising edge).
+        items:
+          enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ]
+        allOf:
+          - $ref: /schemas/types.yaml#/definitions/non-unique-string-array
+
+      st,adc-alt-channel:
+        description:
+          Must be defined if two sigma delta modulators are
+          connected on same SPI input.
+          If not set, channel n is connected to SPI input n.
+          If set, channel n is connected to SPI input n + 1.
+        type: boolean
+
+      st,filter0-sync:
+        description:
+          Set to 1 to synchronize with DFSDM filter instance 0.
+          Used for multi microphones synchronization.
+        type: boolean
+
+      dmas:
+        maxItems: 1
+
+      dma-names:
+        items:
+          - const: rx
+
+    required:
+      - compatible
+      - reg
+      - interrupts
+      - st,adc-channels
+      - st,adc-channel-names
+      - st,filter-order
+      - "#io-channel-cells"
+
+    allOf:
+      - if:
+          properties:
+            compatible:
+              contains:
+                const: st,stm32-dfsdm-adc
+
+      - then:
+          properties:
+            st,adc-channels:
+              minItems: 1
+              maxItems: 8
+
+            st,adc-channel-names:
+              minItems: 1
+              maxItems: 8
+
+            st,adc-channel-types:
+              minItems: 1
+              maxItems: 8
+
+            st,adc-channel-clk-src:
+              minItems: 1
+              maxItems: 8
+
+            io-channels:
+              description:
+                From common IIO binding. Used to pipe external sigma delta
+                modulator or internal ADC output to DFSDM channel.
+                This is not required for "st,stm32-dfsdm-pdm" compatibility as
+                PDM microphone is binded in Audio DT node.
+
+          required:
+            - io-channels
+
+      - if:
+          properties:
+            compatible:
+              contains:
+                const: st,stm32-dfsdm-dmic
+
+      - then:
+          properties:
+            st,adc-channels:
+              maxItems: 1
+
+            st,adc-channel-names:
+              maxItems: 1
+
+            st,adc-channel-types:
+              maxItems: 1
+
+            st,adc-channel-clk-src:
+              maxItems: 1
+
+          required:
+            - dmas
+            - dma-names
+
+          patternProperties:
+            "^dfsdm-dai+$":
+              type: object
+              description: child node
+
+              properties:
+                "#sound-dai-cells":
+                  const: 0
+
+                io-channels:
+                  description:
+                    From common IIO binding. Used to pipe external sigma delta
+                    modulator or internal ADC output to DFSDM channel.
+
+              required:
+                - "#sound-dai-cells"
+                - io-channels
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: st,stm32h7-dfsdm
+
+  - then:
+      patternProperties:
+        "^filter@[0-9]+$":
+          properties:
+            reg:
+              items:
+                minimum: 0
+                maximum: 3
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: st,stm32mp1-dfsdm
+
+  - then:
+      patternProperties:
+        "^filter@[0-9]+$":
+          properties:
+            reg:
+              items:
+                minimum: 0
+                maximum: 5
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/stm32mp1-clks.h>
+    dfsdm: dfsdm@4400d000 {
+      compatible = "st,stm32mp1-dfsdm";
+      reg = <0x4400d000 0x800>;
+      clocks = <&rcc DFSDM_K>, <&rcc ADFSDM_K>;
+      clock-names = "dfsdm", "audio";
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      dfsdm0: filter@0 {
+        compatible = "st,stm32-dfsdm-dmic";
+        reg = <0>;
+        interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
+        dmas = <&dmamux1 101 0x400 0x01>;
+        dma-names = "rx";
+        #io-channel-cells = <1>;
+        st,adc-channels = <1>;
+        st,adc-channel-names = "dmic0";
+        st,adc-channel-types = "SPI_R";
+        st,adc-channel-clk-src = "CLKOUT";
+        st,filter-order = <5>;
+
+        asoc_pdm0: dfsdm-dai {
+          compatible = "st,stm32h7-dfsdm-dai";
+          #sound-dai-cells = <0>;
+          io-channels = <&dfsdm0 0>;
+        };
+      };
+
+      dfsdm_pdm1: filter@1 {
+        compatible = "st,stm32-dfsdm-adc";
+        reg = <1>;
+        interrupts = <GIC_SPI 111 IRQ_TYPE_LEVEL_HIGH>;
+        dmas = <&dmamux1 102 0x400 0x01>;
+        dma-names = "rx";
+        #io-channel-cells = <1>;
+        st,adc-channels = <2 3>;
+        st,adc-channel-names = "in2", "in3";
+        st,adc-channel-types = "SPI_R", "SPI_R";
+        st,adc-channel-clk-src = "CLKOUT_F", "CLKOUT_F";
+        io-channels = <&sd_adc2 &sd_adc3>;
+        st,filter-order = <1>;
+      };
+    };
+
+...
-- 
2.17.1


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