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Message-ID: <20250528121306.1464830-2-dario.binacchi@amarulasolutions.com>
Date: Wed, 28 May 2025 14:11:38 +0200
From: Dario Binacchi <dario.binacchi@...rulasolutions.com>
To: linux-kernel@...r.kernel.org
Cc: michael@...rulasolutions.com,
linux-amarula@...rulasolutions.com,
Dario Binacchi <dario.binacchi@...rulasolutions.com>,
Conor Dooley <conor+dt@...nel.org>,
Fabio Estevam <festevam@...il.com>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Lee Jones <lee@...nel.org>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Rob Herring <robh@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Shawn Guo <shawnguo@...nel.org>,
devicetree@...r.kernel.org,
imx@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 1/4] dt-bindings: mfd: convert mxs-lradc bindings to json-schema
Convert the Freescale MXS Low-Resoulution ADC (LRADC) device tree
binding documentation to json-schema.
The clocks and #io-channel-cells properties have also been added; They
are present in the respective SoC DTSI files but were missing from the
old mxs-lradc.txt file.
Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
---
(no changes since v1)
.../devicetree/bindings/mfd/mxs-lradc.txt | 45 --------
.../devicetree/bindings/mfd/mxs-lradc.yaml | 106 ++++++++++++++++++
2 files changed, 106 insertions(+), 45 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/mfd/mxs-lradc.txt
create mode 100644 Documentation/devicetree/bindings/mfd/mxs-lradc.yaml
diff --git a/Documentation/devicetree/bindings/mfd/mxs-lradc.txt b/Documentation/devicetree/bindings/mfd/mxs-lradc.txt
deleted file mode 100644
index 755cbef0647d..000000000000
--- a/Documentation/devicetree/bindings/mfd/mxs-lradc.txt
+++ /dev/null
@@ -1,45 +0,0 @@
-* Freescale MXS LRADC device driver
-
-Required properties:
-- compatible: Should be "fsl,imx23-lradc" for i.MX23 SoC and "fsl,imx28-lradc"
- for i.MX28 SoC
-- reg: Address and length of the register set for the device
-- interrupts: Should contain the LRADC interrupts
-
-Optional properties:
-- fsl,lradc-touchscreen-wires: Number of wires used to connect the touchscreen
- to LRADC. Valid value is either 4 or 5. If this
- property is not present, then the touchscreen is
- disabled. 5 wires is valid for i.MX28 SoC only.
-- fsl,ave-ctrl: number of samples per direction to calculate an average value.
- Allowed value is 1 ... 32, default is 4
-- fsl,ave-delay: delay between consecutive samples. Allowed value is
- 2 ... 2048. It is used if 'fsl,ave-ctrl' > 1, counts at
- 2 kHz and its default is 2 (= 1 ms)
-- fsl,settling: delay between plate switch to next sample. Allowed value is
- 1 ... 2047. It counts at 2 kHz and its default is
- 10 (= 5 ms)
-
-Example for i.MX23 SoC:
-
- lradc@...50000 {
- compatible = "fsl,imx23-lradc";
- reg = <0x80050000 0x2000>;
- interrupts = <36 37 38 39 40 41 42 43 44>;
- fsl,lradc-touchscreen-wires = <4>;
- fsl,ave-ctrl = <4>;
- fsl,ave-delay = <2>;
- fsl,settling = <10>;
- };
-
-Example for i.MX28 SoC:
-
- lradc@...50000 {
- compatible = "fsl,imx28-lradc";
- reg = <0x80050000 0x2000>;
- interrupts = <10 14 15 16 17 18 19 20 21 22 23 24 25>;
- fsl,lradc-touchscreen-wires = <5>;
- fsl,ave-ctrl = <4>;
- fsl,ave-delay = <2>;
- fsl,settling = <10>;
- };
diff --git a/Documentation/devicetree/bindings/mfd/mxs-lradc.yaml b/Documentation/devicetree/bindings/mfd/mxs-lradc.yaml
new file mode 100644
index 000000000000..90391b02c715
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/mxs-lradc.yaml
@@ -0,0 +1,106 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/mxs-lradc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale MXS Low-Resoulution ADC (LRADC)
+
+maintainers:
+ - Dario Binacchi <dario.binacchi@...rulasolutions.com>
+
+description: |
+ The LRADC provides 16 physical channels of 12-bit resolution
+ for analog-to-digital conversion and includes an integrated
+ 4-wire/5-wire touchscreen controller.
+
+properties:
+ compatible:
+ items:
+ - enum:
+ - fsl,imx23-lradc
+ - fsl,imx28-lradc
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ minItems: 1
+
+ interrupts:
+ minItems: 9
+ maxItems: 13
+
+ fsl,lradc-touchscreen-wires:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Number of wires used to connect the touchscreen to LRADC.
+ If this property is not present, then the touchscreen is disabled.
+
+ fsl,ave-ctrl:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 1
+ maximum: 32
+ default: 4
+ description: |
+ Number of samples per direction to calculate an average value.
+
+ fsl,ave-delay:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 2
+ maximum: 2048
+ default: 2
+ description: |
+ Delay between consecutive samples.
+ It is used if 'fsl,ave-ctrl' > 1, counts at 2 kHz and its
+ default value (i. e. 2) is 1 ms.
+
+ fsl,settling:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 1
+ maximum: 2047
+ default: 10
+ description: |
+ Delay between plate switch to next sample.
+ It counts at 2 kHz and its default (i. e. 10) is 5 ms.
+
+ "#io-channel-cells":
+ const: 1
+
+required:
+ - compatible
+ - reg
+ - clocks
+ - interrupts
+
+if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - fsl,imx23-lradc
+then:
+ properties:
+ fsl,lradc-touchscreen-wires:
+ const: 4
+else:
+ properties:
+ fsl,lradc-touchscreen-wires:
+ enum: [4, 5]
+
+additionalProperties: false
+
+examples:
+ - |
+ lradc@...50000 {
+ compatible = "fsl,imx23-lradc";
+ reg = <0x80050000 0x2000>;
+ interrupts = <36>, <37>, <38>, <39>, <40>,
+ <41>, <42>, <43>, <44>;
+ clocks = <&clks 26>;
+ #io-channel-cells = <1>;
+ fsl,lradc-touchscreen-wires = <4>;
+ fsl,ave-ctrl = <4>;
+ fsl,ave-delay = <2>;
+ fsl,settling = <10>;
+ };
--
2.43.0
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