linux-kernel - [PATCH 01/10] Documentation: dt-bindings: Document STM32 ADC DT bindings

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Message-ID: <1477412722-24061-2-git-send-email-fabrice.gasnier@st.com>
Date:   Tue, 25 Oct 2016 18:25:13 +0200
From:   Fabrice Gasnier <fabrice.gasnier@...com>
To:     <linux-iio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <jic23@...nel.org>, <linux@...linux.org.uk>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...com>, <lars@...afoo.de>, <knaack.h@....de>,
        <pmeerw@...erw.net>, <fabrice.gasnier@...com>
Subject: [PATCH 01/10] Documentation: dt-bindings: Document STM32 ADC DT bindings

This patch adds documentation of device tree bindings for the STM32 ADC.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
---
 .../devicetree/bindings/iio/adc/st,stm32-adc.txt   | 78 ++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt

diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
new file mode 100644
index 0000000..a9a8b3c
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
@@ -0,0 +1,78 @@
+STMicroelectronics STM32 ADC device driver
+
+STM32 ADC is a successive approximation analog-to-digital converter.
+It has several multiplexed input channels. Conversions can be performed
+in single, continuous, scan or discontinuous mode. Result of the ADC is
+stored in a left-aligned or right-aligned 32-bit data register.
+Conversions can be launched in software or using hardware triggers.
+
+The analog watchdog feature allows the application to detect if the input
+voltage goes beyond the user-defined, higher or lower thresholds.
+
+Each STM32 ADC block can have up to 3 ADC instances.
+
+Each instance supports two contexts to manage conversions, each one has its
+own configurable sequence and trigger:
+- regular conversion can be done in sequence, running in background
+- injected conversions have higher priority, and so have the ability to
+  interrupt regular conversion sequence (either triggered in SW or HW).
+  Regular sequence is resumed, in case it has been interrupted.
+
+Required properties:
+- compatible: Should be "st,stm32f4-adc".
+- reg: Offset and length of the ADC block register set.
+- interrupts: Must contain the interrupt for ADC.
+- clocks: Clock for the analog circuitry (common to all ADCs).
+- clock-names: Must be "adc".
+- vref-supply: Phandle to the vref input analog reference voltage.
+- #address-cells = <1>;
+- #size-cells = <0>;
+
+Optional properties:
+- A pinctrl state named "default" for each ADC channel may be defined to set
+  inX ADC pins in mode of operation for analog input on external pin.
+- gpios: Array of gpios that may be configured as EXTi trigger sources.
+
+Example:
+	adc: adc@...12000 {
+		compatible = "st,stm32f4-adc";
+		reg = <0x40012000 0x400>;
+		interrupts = <18>;
+		clocks = <&rcc 0 168>;
+		clock-names = "adc";
+		vref-supply = <&reg_vref>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&adc3_in8_pin>;
+		gpios = <&gpioa 11 0>,
+			<&gpioa 15 0>;
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		adc1: adc1-master@0 {
+			#io-channel-cells = <1>;
+			reg = <0x0>;
+			clocks = <&rcc 0 168>;
+			st,adc-channels = <8>;
+		};
+		...
+		other adc child nodes follow...
+	};
+
+Contents of a stm32 adc child node:
+-----------------------------------
+An ADC block node should contain at least one subnode, representing an
+ADC instance available on the machine.
+
+Required properties:
+- reg: Offset of ADC instance in ADC block (e.g. may be 0x0, 0x100, 0x200).
+- st,adc-channels: List of single-ended channels muxed for this ADC.
+- #io-channel-cells = <1>: See the IIO bindings section "IIO consumers" in
+  Documentation/devicetree/bindings/iio/iio-bindings.txt
+
+Optional properties:
+- clocks: Input clock private to this ADC instance.
+- st,injected: Use injected conversion sequence on an ADC, rather than regular.
+- dmas: Phandle to dma channel for this ADC instance, only for regular
+  conversions. See ../../dma/dma.txt for details.
+- dma-names: Must be "rx" when dmas property is being used.
-- 
1.9.1