| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20250317090803.30003-2-marius.cristea@microchip.com>
Date: Mon, 17 Mar 2025 11:08:02 +0200
From: <marius.cristea@...rochip.com>
To: <jic23@...nel.org>, <lars@...afoo.de>, <robh@...nel.org>
CC: <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <oskar.andero@...il.com>,
<linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <marius.cristea@...rochip.com>
Subject: [PATCH v2 1/2] dt-bindings: iio: adc: adding support for PAC194X
From: Marius Cristea <marius.cristea@...rochip.com>
This is the device tree schema for iio driver for Microchip PAC194X and
PAC195X series of Power Monitors with Accumulator.
The PAC194X family supports 9V Full-Scale Range and the PAC195X supports
32V Full-Scale Range.
There are two versions of the PAC194X/5X: the PAC194X/5X-1 devices are
for high-side current sensing and the PAC194X/5X-2 devices are for
low-side current sensing or floating VBUS applications.
The PAC194X/5X-1 is named shortly PAC194X/5X.
Signed-off-by: Marius Cristea <marius.cristea@...rochip.com>
---
.../bindings/iio/adc/microchip,pac1944.yaml | 195 ++++++++++++++++++
1 file changed, 195 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/adc/microchip,pac1944.yaml
diff --git a/Documentation/devicetree/bindings/iio/adc/microchip,pac1944.yaml b/Documentation/devicetree/bindings/iio/adc/microchip,pac1944.yaml
new file mode 100644
index 000000000000..1997e889e3f6
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/microchip,pac1944.yaml
@@ -0,0 +1,195 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/microchip,pac1944.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip PAC1944 and PAC1954 Power Monitors with Accumulator
+
+maintainers:
+ - Marius Cristea <marius.cristea@...rochip.com>
+
+description: |
+ This device is part of the Microchip family of Power Monitors with
+ Accumulator. The datasheet for PAC1941-1, PAC1941-1, PAC1942-1, PAC1942-2,
+ PAC1943-1 and PAC1944-1 can be found here:
+ https://ww1.microchip.com/downloads/aemDocuments/documents/MSLD/ProductDocuments/DataSheets/PAC194X-Family-Data-Sheet-DS20006543.pdf
+ The datasheet for PAC1951-1, PAC1951-1, PAC1952-1, PAC1952-2, PAC1953-1 and
+ PAC1954-1 can be found here:
+ https://ww1.microchip.com/downloads/aemDocuments/documents/MSLD/ProductDocuments/DataSheets/PAC195X-Family-Data-Sheet-DS20006539.pdf
+
+properties:
+ compatible:
+ enum:
+ - microchip,pac1941
+ - microchip,pac19412
+ - microchip,pac1942
+ - microchip,pac19422
+ - microchip,pac1943
+ - microchip,pac1944
+ - microchip,pac1951
+ - microchip,pac19512
+ - microchip,pac1952
+ - microchip,pac19522
+ - microchip,pac1953
+ - microchip,pac1954
+
+ reg:
+ maxItems: 1
+
+ vdd-supply: true
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 0
+
+ interrupts:
+ maxItems: 2
+
+ interrupt-names:
+ maxItems: 2
+ items:
+ enum:
+ - alert1
+ - alert2
+
+patternProperties:
+ "^channel@[1-4]+$":
+ type: object
+ $ref: adc.yaml
+ description:
+ Represents the external channels which are connected to the ADC.
+
+ properties:
+ reg:
+ items:
+ minimum: 1
+ maximum: 4
+
+ shunt-resistor-micro-ohms:
+ description:
+ Value in micro Ohms of the shunt resistor connected between
+ the SENSE+ and SENSE- inputs, across which the current is measured.
+ Value is needed to compute the scaling of the measured current.
+
+ microchip,vbus-mode:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ In order to increase measurement resolution and keeping the same
+ number the of bits the device has a configurable VBUS full range
+ scale (FSR). The range should be set by hardware design and it should
+ not be changed during runtime. The bipolar capability for VBUS enables
+ accurate offset measurement and correction.
+ The VBUS could be configured into the following full scale range
+ <0> - VBUS has unipolar +32V to 0V FSR (default) for PAC195X
+ or +9V to 0V (default) for PAC194X
+ <1> - VBUS has bipolar +32V to -32V FSR for PAC195X
+ or +9V to -9V for PAC194X. The actual range is limited to
+ about -200 mV due to the impact of the ESD structures.
+ <2> - VBUS has bipolar +16V to -16V FSR for PAC195X
+ or +4.5V to -4.5V for PAC194X. The actual range is limited
+ to about -200 mV due to the impact of the ESD structures.
+ maximum: 2
+
+ microchip,vsense-mode:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ In order to decrease the power dissipation on the shunt resistor and
+ in the same time to increase measurement resolution by keeping the
+ same number the of bits the device has a configurable VSENSE full
+ range scale (FSR). The range should be set by hardware design and it
+ should not be changed during runtime.
+ The VSENSE could be configured into the following full scale range
+ <0> - VSENSE has unipolar +100 mV to 0V FSR (default)
+ <1> - VSENSE has bipolar +100 mV to -100 mV FSR
+ <2> - VSENSE has bipolar +50 mV to -50 mV FSR
+ maximum: 2
+
+ microchip,accumulation-mode:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ The Hardware Accumulator may be used to accumulate VPOWER, VSENSE or
+ VBUS values for any channel. By setting the accumulator for a channel
+ to accumulate the VPOWER values gives a measure of accumulated power
+ into a time period, which is equivalent to energy. Setting the
+ accumulator for a channel to accumulate VSENSE values gives a measure
+ of accumulated current, which is equivalent to charge. This allows the
+ accumulator to be used as a coulomb counter. For either VSENSE or
+ VBUS, many samples may be accumulated on chip and the result collected
+ by the host and divided by the accumulator counter count value to
+ yield an average value with a very long integration time to reduce
+ noise. This feature is also very useful for system calibration,
+ allowing many averages to be accumulated for fast averaging/noise
+ reduction.
+ This functionality needs to be setup once and must not be changed
+ during the runtime, just in case the user wants to measure the charge
+ or the energy consumed from board power up till the user has control
+ or during a reboot of the system.
+ The Hardware Accumulator could be configured to accumulate
+ VPOWER, VSENSE or VBUS
+ <0> - Accumulator accumulates VPOWER (default)
+ <1> - Accumulator accumulates VSENSE
+ <2> - Accumulator accumulates VBUS
+ maximum: 2
+
+ required:
+ - reg
+ - shunt-resistor-micro-ohms
+
+ unevaluatedProperties: false
+
+required:
+ - compatible
+ - reg
+ - vdd-supply
+ - "#address-cells"
+ - "#size-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ power-monitor@10 {
+ compatible = "microchip,pac1954";
+ reg = <0x10>;
+ vdd-supply = <&vdd>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ channel@1 {
+ reg = <0x1>;
+ shunt-resistor-micro-ohms = <24900>;
+ label = "CPU";
+ microchip,vbus-mode = <0>;
+ microchip,vsense-mode = <0>;
+ microchip,accumulation-mode = <0>;
+ };
+
+ channel@3 {
+ reg = <0x3>;
+ shunt-resistor-micro-ohms = <75000>;
+ label = "MEM";
+ microchip,vbus-mode = <0>;
+ microchip,vsense-mode = <0>;
+ microchip,accumulation-mode = <0>;
+ };
+
+ channel@4 {
+ reg = <0x4>;
+ shunt-resistor-micro-ohms = <100000>;
+ label = "NET";
+ microchip,vbus-mode = <0>;
+ microchip,vsense-mode = <0>;
+ microchip,accumulation-mode = <0>;
+ };
+ };
+ };
+
+...
--
2.45.2
Powered by blists - more mailing lists