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Subject[PATCH 1/2] dt-bindings: hwmon: Add Baikal-T1 PVT sensor bindings
Date
From: Serge Semin <Sergey.Semin@baikalelectronics.ru>

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@baikalelectronics.ru>
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
---
.../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
+#
+# Copyright (C) 2019 BAIKAL ELECTRONICS, JSC
+#
+# Baikal-T1 Process, Voltage, Temperature Sensor Device Tree Bindings.
+#
+%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@gmail.com>
+
+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 {
+ 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
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