linux-kernel - [PATCH 1/4] dt-bindings: Add Raspberry Pi's RP1 ADC

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Message-ID: <20250925000416.2408457-2-svarbanov@suse.de>
Date: Thu, 25 Sep 2025 03:04:13 +0300
From: Stanimir Varbanov <svarbanov@...e.de>
To: linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rpi-kernel@...ts.infradead.org,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	linux-hwmon@...r.kernel.org
Cc: Jean Delvare <jdelvare@...e.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Rob Herring <robh@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Andrew Lunn <andrew@...n.ch>,
	Stefan Wahren <wahrenst@....net>,
	Saenz Julienne <nsaenz@...nel.org>,
	Andrea della Porta <andrea.porta@...e.com>,
	Phil Elwell <phil@...pberrypi.com>,
	Jonathan Bell <jonathan@...pberrypi.com>,
	Dave Stevenson <dave.stevenson@...pberrypi.com>,
	Stanimir Varbanov <svarbanov@...e.de>
Subject: [PATCH 1/4] dt-bindings: Add Raspberry Pi's RP1 ADC

Document dt-bindings for Raspberry Pi's RP1 ADC.

Signed-off-by: Stanimir Varbanov <svarbanov@...e.de>
---
 .../bindings/hwmon/raspberrypi,rp1-adc.yaml   | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/raspberrypi,rp1-adc.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/raspberrypi,rp1-adc.yaml b/Documentation/devicetree/bindings/hwmon/raspberrypi,rp1-adc.yaml
new file mode 100644
index 000000000000..5266b253fd2b
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/raspberrypi,rp1-adc.yaml
@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/raspberrypi,rp1-adc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rasberry Pi RP1 ADC device
+
+maintainers:
+  - Stanimir Varbanov <svarbanov@...e.de>
+
+description: |
+  The RP1 ADC is a five input successive-approximation ADC with 12-bit
+  resolution (ENOB 9.5-bit) at 500kSPS. It has four external inputs
+  and one internal temperature sensor.
+
+properties:
+  compatible:
+    const: raspberrypi,rp1-adc
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  vref-supply:
+    description:
+      Reference voltage regulator 3.3V.
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - vref-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    adc@...c8000 {
+      compatible = "raspberrypi,rp1-adc";
+      reg = <0x400c8000 0x4000>;
+      clocks = <&rp1_clocks 30>;
+      vref-supply = <&rp1_vdd_3v3>;
+    };
-- 
2.47.0