From patchwork Thu May 28 14:28:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11575949 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 152CE90 for ; Thu, 28 May 2020 14:28:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 019662084C for ; Thu, 28 May 2020 14:28:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391145AbgE1O2Q (ORCPT ); Thu, 28 May 2020 10:28:16 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:42298 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390932AbgE1O2P (ORCPT ); Thu, 28 May 2020 10:28:15 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id BC75980307C3; Thu, 28 May 2020 14:28:10 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HcNopUzspTTO; Thu, 28 May 2020 17:28:09 +0300 (MSK) From: Serge Semin To: Jean Delvare , Guenter Roeck , Rob Herring CC: Serge Semin , Serge Semin , Maxim Kaurkin , Rob Herring , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , , , , Subject: [PATCH v4 1/3] dt-bindings: hwmon: Add Baikal-T1 PVT sensor binding Date: Thu, 28 May 2020 17:28:03 +0300 Message-ID: <20200528142805.29115-2-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200528142805.29115-1-Sergey.Semin@baikalelectronics.ru> References: <20200528142805.29115-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org 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. Co-developed-by: Maxim Kaurkin Signed-off-by: Maxim Kaurkin Signed-off-by: Serge Semin Reviewed-by: Rob Herring Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: linux-mips@vger.kernel.org --- Changelog v2: - Lowercase the node-name in the example. - Add dual-license header. - Don't use a multi-arg clock phandle reference in the examples dt-binding property. Thus reundant include pre-processor statement can be removed. - Replace "additionalProperties: false" property with "unevaluatedProperties: false". - Discard label definition from the example. - Align settings of the "#thermal-sensor-cells" property with two spaces ahead of the property line start. Changelog v3: - Add "baikal,pvt-temp-trim-millicelsius" property support. Changelog v4: - Rename the "baikal,pvt-temp-trim-millicelsius" property to "baikal,pvt-temp-offset-millicelsius". --- .../bindings/hwmon/baikal,bt1-pvt.yaml | 107 ++++++++++++++++++ 1 file changed, 107 insertions(+) create mode 100644 Documentation/devicetree/bindings/hwmon/baikal,bt1-pvt.yaml diff --git a/Documentation/devicetree/bindings/hwmon/baikal,bt1-pvt.yaml b/Documentation/devicetree/bindings/hwmon/baikal,bt1-pvt.yaml new file mode 100644 index 000000000000..84ae4cdd08ed --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/baikal,bt1-pvt.yaml @@ -0,0 +1,107 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +# Copyright (C) 2020 BAIKAL ELECTRONICS, JSC +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/hwmon/baikal,bt1-pvt.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Baikal-T1 PVT Sensor + +maintainers: + - Serge Semin + +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: baikal,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 + + baikal,pvt-temp-offset-millicelsius: + description: | + Temperature sensor trimming factor. It can be used to manually adjust the + temperature measurements within 7.130 degrees Celsius. + maxItems: 1 + items: + default: 0 + minimum: 0 + maximum: 7130 + +unevaluatedProperties: false + +required: + - compatible + - reg + - interrupts + - clocks + - clock-names + +examples: + - | + #include + + pvt@1f200000 { + compatible = "baikal,bt1-pvt"; + reg = <0x1f200000 0x1000>; + #thermal-sensor-cells = <0>; + + interrupts = ; + + baikal,pvt-temp-trim-millicelsius = <1000>; + + clocks = <&ccu_sys>, <&ccu_sys>; + clock-names = "ref", "pclk"; + }; +...