On Fri, Mar 06, 2020 at 04:26:03PM +0300, Sergey.Semin@xxxxxxxxxxxxxxxxxxxx wrote: > From: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx> > > Baikal-T1 SoC is equipped with an embedded process, voltage and > temperature sensor to monitor the chip internal environment like > temperature, supply voltage and transistors performance. > > This bindings describes the external Baikal-T1 PVT control interfaces > like MMIO registers space, interrupt request number and clocks source. > These are then used by the corresponding hwmon device driver to > implement the sysfs files-based access to the sensors functionality. > > Signed-off-by: Maxim Kaurkin <maxim.kaurkin@xxxxxxxxxxxxxxxxxxxx> > Signed-off-by: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx> > Signed-off-by: Alexey Malahov <Alexey.Malahov@xxxxxxxxxxxxxxxxxxxx> > Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx> > Cc: Paul Burton <paulburton@xxxxxxxxxx> > Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx> > --- > .../devicetree/bindings/hwmon/be,bt1-pvt.yaml | 100 ++++++++++++++++++ > 1 file changed, 100 insertions(+) > create mode 100644 Documentation/devicetree/bindings/hwmon/be,bt1-pvt.yaml > > diff --git a/Documentation/devicetree/bindings/hwmon/be,bt1-pvt.yaml b/Documentation/devicetree/bindings/hwmon/be,bt1-pvt.yaml > new file mode 100644 > index 000000000000..d575d124d538 > --- /dev/null > +++ b/Documentation/devicetree/bindings/hwmon/be,bt1-pvt.yaml > @@ -0,0 +1,100 @@ > +# SPDX-License-Identifier: GPL-2.0 Dual license > +# > +# Copyright (C) 2019 BAIKAL ELECTRONICS, JSC > +# > +# Baikal-T1 Process, Voltage, Temperature Sensor Device Tree Bindings. drop > +# > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/hwmon/be,bt1-pvt.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Baikal-T1 PVT Sensor Device Tree Bindings > + > +maintainers: > + - Serge Semin <fancer.lancer@xxxxxxxxx> > + > +description: | > + Baikal-T1 SoC provides an embedded process, voltage and temperature > + sensor to monitor an internal SoC environment (chip temperature, supply > + voltage and process monitor) and on time detect critical situations, > + which may cause the system instability and even damages. The IP-block > + is based on the Analog Bits PVT sensor, but is equipped with a dedicated > + control wrapper, which provides a MMIO registers-based access to the > + sensor core functionality (APB3-bus based) and exposes an additional > + functions like thresholds/data ready interrupts, its status and masks, > + measurements timeout. Its internal structure is depicted on the next > + diagram: > + Analog Bits core Bakal-T1 PVT control block > + +--------------------+ +------------------------+ > + | Temperature sensor |-+ +------| Sensors control | > + |--------------------| |<---En---| |------------------------| > + | Voltage sensor |-|<--Mode--| +--->| Sampled data | > + |--------------------| |<--Trim--+ | |------------------------| > + | Low-Vt sensor |-| | +--| Thresholds comparator | > + |--------------------| |---Data----| | |------------------------| > + | High-Vt sensor |-| | +->| Interrupts status | > + |--------------------| |--Valid--+-+ | |------------------------| > + | Standard-Vt sensor |-+ +---+--| Interrupts mask | > + +--------------------+ |------------------------| > + ^ | Interrupts timeout | > + | +------------------------+ > + | ^ ^ > + Rclk-----+----------------------------------------+ | > + APB3-------------------------------------------------+ > + > + This bindings describes the external Baikal-T1 PVT control interfaces > + like MMIO registers space, interrupt request number and clocks source. > + These are then used by the corresponding hwmon device driver to > + implement the sysfs files-based access to the sensors functionality. > + > +properties: > + compatible: > + const: be,bt1-pvt > + > + reg: > + maxItems: 1 > + > + interrupts: > + maxItems: 1 > + > + clocks: > + items: > + - description: PVT reference clock. > + - description: APB3 interface clock. > + > + clock-names: > + items: > + - const: ref > + - const: pclk > + > + "#thermal-sensor-cells": > + description: Baikal-T1 can be referenced as the CPU thermal-sensor. > + const: 0 > + > +additionalProperties: false > + > +required: > + - compatible > + - reg > + - interrupts > + - clocks > + - clock-names > + > +examples: > + - | > + #include <dt-bindings/interrupt-controller/mips-gic.h> > + #include <dt-bindings/clock/bt1-ccu.h> > + > + pvt: pvt@1F200000 { lowercase hex > + compatible = "be,bt1-pvt"; > + reg = <0x1F200000 0x1000>; > + #thermal-sensor-cells = <0>; > + > + interrupts = <GIC_SHARED 31 IRQ_TYPE_LEVEL_HIGH>; > + > + clocks = <&ccu_sys CCU_SYS_PVT_CLK>, > + <&ccu_sys CCU_SYS_APB_CLK>; > + clock-names = "ref", "pclk"; > + }; > +... > -- > 2.25.1 >
