linux-kernel - [PATCH 1/2] dt-bindings: iio: adc: Add binding documentation for Renesas RZ/G2L A/D converter

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Date:   Tue, 29 Jun 2021 23:03:27 +0100
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Rob Herring <robh+dt@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH 1/2] dt-bindings: iio: adc: Add binding documentation for Renesas RZ/G2L A/D converter

Add binding documentation for Renesas RZ/G2L A/D converter block.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
---
 .../bindings/iio/adc/renesas,rzg2l-adc.yaml   | 121 ++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/renesas,rzg2l-adc.yaml

diff --git a/Documentation/devicetree/bindings/iio/adc/renesas,rzg2l-adc.yaml b/Documentation/devicetree/bindings/iio/adc/renesas,rzg2l-adc.yaml
new file mode 100644
index 000000000000..db935d6d59eb
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/renesas,rzg2l-adc.yaml
@@ -0,0 +1,121 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/renesas,rzg2l-adc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas RZ/G2L ADC
+
+maintainers:
+  - Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
+
+description: |
+  A/D Converter block is a successive approximation analog-to-digital converter
+  with a 12-bit accuracy. Up to eight analog input channels can be selected.
+  Conversions can be performed in single or repeat mode. Result of the ADC is
+  stored in a 32-bit data register corresponding to each channel.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - renesas,r9a07g044-adc   # RZ/G2{L,LC}
+          - const: renesas,rzg2l-adc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: converter clock
+      - description: peripheral clock
+
+  clock-names:
+    items:
+      - const: adclk
+      - const: pclk
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    maxItems: 2
+
+  reset-names:
+    items:
+      - const: presetn
+      - const: adrst-n
+
+  renesas-rzg2l,adc-trigger-mode:
+    $ref: /schemas/types.yaml#/definitions/uint8
+    description: Trigger mode for A/D converter
+    enum:
+      - 0 # Software trigger mode (Defaults)
+      - 1 # Asynchronous trigger using ADC_TRG trigger input pin
+      - 2 # Synchronous trigger (Trigger from MTU3a/GPT)
+    default: 0
+
+  gpios:
+    description:
+      ADC_TRG trigger input pin
+    maxItems: 1
+
+  renesas-rzg2l,adc-channels:
+    $ref: /schemas/types.yaml#/definitions/uint8-array
+    description: Input channels available on platform
+    uniqueItems: true
+    minItems: 1
+    maxItems: 8
+    items:
+      enum: [0, 1, 2, 3, 4, 5, 6, 7]
+
+  "#io-channel-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - power-domains
+  - resets
+  - reset-names
+  - renesas-rzg2l,adc-channels
+  - "#io-channel-cells"
+
+allOf:
+  - if:
+      properties:
+        renesas-rzg2l,adc-trigger-mode:
+          const: 1
+    then:
+      required:
+        - gpios
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/r9a07g044-cpg.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    adc: adc@...59000 {
+      compatible = "renesas,r9a07g044-adc", "renesas,rzg2l-adc";
+      reg = <0x10059000 0x400>;
+      interrupts = <GIC_SPI 347 IRQ_TYPE_EDGE_RISING>;
+      clocks = <&cpg CPG_MOD R9A07G044_ADC_ADCLK>,
+               <&cpg CPG_MOD R9A07G044_ADC_PCLK>;
+      clock-names = "adclk", "pclk";
+      power-domains = <&cpg>;
+      resets = <&cpg R9A07G044_ADC_PRESETN>,
+               <&cpg R9A07G044_ADC_ADRST_N>;
+      reset-names = "presetn", "adrst-n";
+      #io-channel-cells = <1>;
+      renesas-rzg2l,adc-trigger-mode = /bits/ 8 <0>;
+      renesas-rzg2l,adc-channels = /bits/ 8 <0 1 2 3 4 5 6>;
+    };
-- 
2.17.1