From nobody Mon Apr 13 14:27:12 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 247FFC4332F for ; Mon, 14 Nov 2022 07:58:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235952AbiKNH6F (ORCPT ); Mon, 14 Nov 2022 02:58:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51166 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235551AbiKNH5t (ORCPT ); Mon, 14 Nov 2022 02:57:49 -0500 Received: from mail-wm1-x32c.google.com (mail-wm1-x32c.google.com [IPv6:2a00:1450:4864:20::32c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A2950226 for ; Sun, 13 Nov 2022 23:57:48 -0800 (PST) Received: by mail-wm1-x32c.google.com with SMTP id ja4-20020a05600c556400b003cf6e77f89cso8831102wmb.0 for ; Sun, 13 Nov 2022 23:57:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=9elements.com; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=8qK4j2egvGTI6/Ds/7rUZ9PAbrRygxTRbXoBmV3kxlw=; b=DzRMn3c18YYNaCPzn2PdsF//Nzda+vA8qQrP4Co5xkCEKPBEUU7Re8dTU6ykxAf+af NLWrHsjgfk6Q+JMIcQjgTMRvGf6G26sofH76guu4HrEBJRuYL2urT6sAi4IDAfcmYCKg wvvDvPpl2oo8lvpsKOPqRfDdavQNWbzJt+oq13RuwXnvzqL/sqM7CMukehewyiq7NBK5 GtktEbzvP4u/clhDA0y/1RAk4T4gfbEos2qp36uvt7nZFG1kQezyRO1A+f0cCLK3aQ9N aZD5nsujJ9HfLHHq2zTWVLBfU5b3k24DSt/V6CuIrVTtsuc9WR7u7B9MAwwY+eX2JgK1 ylWw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=8qK4j2egvGTI6/Ds/7rUZ9PAbrRygxTRbXoBmV3kxlw=; b=BzqMUrETd4mEngBVev9uC3va1dmC43Rt8YR60VCHTAJdRGry4fZihPldLv3DoE06Dd VbzV2zNeCLNVBj7UWrTnzdbDO4812PdO11902BEasb1vxJBBXH6pyUGLNiK/WSVQJGf7 z/VM7f5oxgmtPvB98QQyrL3OYjKWs0NGDYLKyiIPPM3AwwClnhzCL+QcN2KPbgZRcHs9 fMPtb4W5/1sLMNQQez5x07cxO4jhUuvy+MGlzVRqA61DNq1OvjjraXlO7TtbeeF22tBi UBqLZXHKwNu7m3B8CpCFFAR+TYPPs2l3tiz5xl4qW6rBKqXM5spketRKzH27ZvJlPW56 cGZA== X-Gm-Message-State: ANoB5pn1mfNTq5ZxQrlU68sv/lckmdxdAvF4mtzUvvB3tGZN7LCdYsVN S8XVwpHwGBhVKJSFHHCwgp8b82YQgx1lN2UR X-Google-Smtp-Source: AA0mqf4KvIolNa5ifG5ln6Rh2uLfg635rOewAU50fc32yfKLc9lCus+x4f/kOiY5RNjSYNZAzf9JbA== X-Received: by 2002:a05:600c:4d85:b0:3cf:90de:7724 with SMTP id v5-20020a05600c4d8500b003cf90de7724mr7011758wmp.18.1668412666828; Sun, 13 Nov 2022 23:57:46 -0800 (PST) Received: from stroh80.sec.9e.network (ip-078-094-000-051.um19.pools.vodafone-ip.de. [78.94.0.51]) by smtp.gmail.com with ESMTPSA id p25-20020a05600c1d9900b003c64c186206sm11617768wms.16.2022.11.13.23.57.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 13 Nov 2022 23:57:46 -0800 (PST) From: Naresh Solanki X-Google-Original-From: Naresh Solanki To: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Lee Jones , Rob Herring , Krzysztof Kozlowski , Patrick Rudolph Cc: Marcello Sylvester Bauer , Naresh Solanki Subject: [PATCH v9 1/2] dt-bindings: mfd: Add dt-schema MAX5970 and MAX5978 Date: Mon, 14 Nov 2022 08:57:38 +0100 Message-Id: <20221114075739.4117439-2-Naresh.Solanki@9elements.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221114075739.4117439-1-Naresh.Solanki@9elements.com> References: <20221114075739.4117439-1-Naresh.Solanki@9elements.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Marcello Sylvester Bauer The MAX597x is a hot swap controller with configurable fault protection. It also has 10bit ADC for current & voltage measurements. Signed-off-by: Patrick Rudolph Signed-off-by: Marcello Sylvester Bauer Signed-off-by: Naresh Solanki --- .../bindings/mfd/maxim,max5970.yaml | 172 ++++++++++++++++++ 1 file changed, 172 insertions(+) create mode 100644 Documentation/devicetree/bindings/mfd/maxim,max5970.yaml diff --git a/Documentation/devicetree/bindings/mfd/maxim,max5970.yaml b/Doc= umentation/devicetree/bindings/mfd/maxim,max5970.yaml new file mode 100644 index 000000000000..a93b6e009b9a --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/maxim,max5970.yaml @@ -0,0 +1,172 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mfd/maxim,max5970.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Regulator for MAX5970 smart switch from Maxim Integrated. + +maintainers: + - Patrick Rudolph + +description: | + The smart switch provides no output regulation, but independent fault pr= otection + and voltage and current sensing. + Programming is done through I2C bus. + + Datasheets: + https://datasheets.maximintegrated.com/en/ds/MAX5970.pdf + https://datasheets.maximintegrated.com/en/ds/MAX5978.pdf + +properties: + compatible: + enum: + - maxim,max5970 + - maxim,max5978 + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + leds: + type: object + description: + Properties for four LEDS. + + properties: + "#address-cells": + const: 1 + + "#size-cells": + const: 0 + + patternProperties: + "^led@[0-3]$": + $ref: /schemas/leds/common.yaml# + type: object + + additionalProperties: false + + vss1-supply: + description: Supply of the first channel. + + vss2-supply: + description: Supply of the second channel. + + "#io-channel-cells": + const: 1 + + regulators: + type: object + description: + Properties for regulator. + + patternProperties: + "^sw[0-1]$": + $ref: /schemas/regulator/regulator.yaml# + type: object + properties: + shunt-resistor-micro-ohms: + description: | + The value of curent sense resistor in microohms. + + required: + - shunt-resistor-micro-ohms + + additionalProperties: false + +required: + - compatible + - reg + - regulators + - vss1-supply + +allOf: + - if: + properties: + compatible: + enum: + - maxim,max5970 + then: + properties: + io-channels: + items: + - description: voltage first channel + - description: current first channel + - description: voltage second channel + - description: current second channel + description: | + Voltage and current for first and second channel. + required: + - vss2-supply + else: + properties: + io-channels: + items: + - description: voltage first channel + - description: current first channel + description: | + Voltage and current for first channel. + +additionalProperties: false + +examples: + - | + i2c { + #address-cells =3D <1>; + #size-cells =3D <0>; + regulator@3a { + compatible =3D "maxim,max5978"; + reg =3D <0x3a>; + vss1-supply =3D <&p3v3>; + + regulators { + sw0_ref_0: sw0 { + regulator-compatible =3D "SW0"; + shunt-resistor-micro-ohms =3D <12000>; + }; + }; + + leds { + #address-cells =3D <1>; + #size-cells =3D <0>; + led@0 { + reg =3D <0>; + label =3D "led0"; + default-state =3D "on"; + }; + led@1 { + reg =3D <1>; + label =3D "led1"; + default-state =3D "on"; + }; + }; + }; + }; + + - | + i2c { + #address-cells =3D <1>; + #size-cells =3D <0>; + + regulator@3a { + compatible =3D "maxim,max5970"; + reg =3D <0x3a>; + vss1-supply =3D <&p3v3>; + vss2-supply =3D <&p5v>; + + regulators { + sw0_ref_1: sw0 { + regulator-compatible =3D "SW0"; + shunt-resistor-micro-ohms =3D <12000>; + }; + sw1_ref_1: sw1 { + regulator-compatible =3D "SW1"; + shunt-resistor-micro-ohms =3D <10000>; + }; + }; + }; + }; +... --=20 2.37.3 From nobody Mon Apr 13 14:27:12 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 22F01C4332F for ; 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[78.94.0.51]) by smtp.gmail.com with ESMTPSA id p25-20020a05600c1d9900b003c64c186206sm11617768wms.16.2022.11.13.23.57.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 13 Nov 2022 23:57:47 -0800 (PST) From: Naresh Solanki X-Google-Original-From: Naresh Solanki To: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Lee Jones Cc: Patrick Rudolph , Marcello Sylvester Bauer , Naresh Solanki Subject: [PATCH v9 2/2] mfd: max597x: Add support for MAX5970 and MAX5978 Date: Mon, 14 Nov 2022 08:57:39 +0100 Message-Id: <20221114075739.4117439-3-Naresh.Solanki@9elements.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221114075739.4117439-1-Naresh.Solanki@9elements.com> References: <20221114075739.4117439-1-Naresh.Solanki@9elements.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Patrick Rudolph Implement a regulator driver with IRQ support for fault management. Written against documentation [1] and [2] and tested on real hardware. Every channel has its own regulator supplies nammed 'vss1-supply' and 'vss2-supply'. The regulator supply is used to determine the output voltage, as the smart switch provides no output regulation. The driver requires the 'shunt-resistor-micro-ohms' property to be present in Device Tree to properly calculate current related values. Datasheet links: 1: https://datasheets.maximintegrated.com/en/ds/MAX5970.pdf 2: https://datasheets.maximintegrated.com/en/ds/MAX5978.pdf Signed-off-by: Patrick Rudolph Signed-off-by: Marcello Sylvester Bauer Signed-off-by: Naresh Solanki --- drivers/mfd/Kconfig | 12 +++++ drivers/mfd/Makefile | 1 + drivers/mfd/max597x.c | 92 ++++++++++++++++++++++++++++++++ include/linux/mfd/max597x.h | 103 ++++++++++++++++++++++++++++++++++++ 4 files changed, 208 insertions(+) create mode 100644 drivers/mfd/max597x.c create mode 100644 include/linux/mfd/max597x.h diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 8b93856de432..416fe7986b7b 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -253,6 +253,18 @@ config MFD_MADERA_SPI Support for the Cirrus Logic Madera platform audio SoC core functionality controlled via SPI. =20 +config MFD_MAX597X + tristate "Maxim 597x Power Switch and Monitor" + depends on I2C + depends on OF + select MFD_CORE + select REGMAP_I2C + help + This driver controls a Maxim 5970/5978 switch via I2C bus. + The MAX5970/5978 is a smart switch with no output regulation, but + fault protection and voltage and current monitoring capabilities. + Also it supports upto 4 indication LEDs. + config MFD_CS47L15 bool "Cirrus Logic CS47L15" select PINCTRL_CS47L15 diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 7ed3ef4a698c..819d711fa748 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -161,6 +161,7 @@ obj-$(CONFIG_MFD_DA9063) +=3D da9063.o obj-$(CONFIG_MFD_DA9150) +=3D da9150-core.o =20 obj-$(CONFIG_MFD_MAX14577) +=3D max14577.o +obj-$(CONFIG_MFD_MAX597X) +=3D max597x.o obj-$(CONFIG_MFD_MAX77620) +=3D max77620.o obj-$(CONFIG_MFD_MAX77650) +=3D max77650.o obj-$(CONFIG_MFD_MAX77686) +=3D max77686.o diff --git a/drivers/mfd/max597x.c b/drivers/mfd/max597x.c new file mode 100644 index 000000000000..ae43d57cde26 --- /dev/null +++ b/drivers/mfd/max597x.c @@ -0,0 +1,92 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Maxim MAX5970/MAX5978 Power Switch & Monitor + * + * Copyright (c) 2022 9elements GmbH + * + * Author: Patrick Rudolph + */ + +#include +#include +#include +#include + +static const struct regmap_config max597x_regmap_config =3D { + .reg_bits =3D 8, + .val_bits =3D 8, + .max_register =3D MAX_REGISTERS, +}; + +static const struct mfd_cell max597x_cells[] =3D { + { .name =3D "max597x-regulator", }, + { .name =3D "max597x-iio", }, + { .name =3D "max597x-led", }, +}; + +static int max597x_probe(struct i2c_client *i2c, const struct i2c_device_i= d *id) +{ + struct max597x_data *ddata; + enum max597x_chip_type chip =3D id->driver_data; + + ddata =3D devm_kzalloc(&i2c->dev, sizeof(*ddata), GFP_KERNEL); + if (!ddata) + return -ENOMEM; + + /* + * Based on chip type, Initialize the number of switch. This is needed by + * regulator & iio cells. + */ + switch (chip) { + case MAX597x_TYPE_MAX5970: + ddata->num_switches =3D MAX5970_NUM_SWITCHES; + break; + case MAX597x_TYPE_MAX5978: + ddata->num_switches =3D MAX5978_NUM_SWITCHES; + break; + } + + ddata->regmap =3D devm_regmap_init_i2c(i2c, &max597x_regmap_config); + if (IS_ERR(ddata->regmap)) { + dev_err(&i2c->dev, "Failed to initialize regmap"); + return PTR_ERR(ddata->regmap); + } + + /* IRQ used by regulator cell */ + ddata->irq =3D i2c->irq; + ddata->dev =3D &i2c->dev; + i2c_set_clientdata(i2c, ddata); + + return devm_mfd_add_devices(ddata->dev, PLATFORM_DEVID_AUTO, + max597x_cells, ARRAY_SIZE(max597x_cells), + NULL, 0, NULL); +} + +static const struct i2c_device_id max597x_table[] =3D { + { .name =3D "max5970", MAX597x_TYPE_MAX5970 }, + { .name =3D "max5978", MAX597x_TYPE_MAX5978 }, +}; + +MODULE_DEVICE_TABLE(i2c, max597x_table); + +static const struct of_device_id max597x_of_match[] =3D { + { .compatible =3D "maxim,max5970", .data =3D (void *)MAX597x_TYPE_MAX5970= }, + { .compatible =3D "maxim,max5978", .data =3D (void *)MAX597x_TYPE_MAX5978= }, + {} +}; + +MODULE_DEVICE_TABLE(of, max597x_of_match); + +static struct i2c_driver max597x_driver =3D { + .id_table =3D max597x_table, + .driver =3D { + .name =3D "max597x", + .of_match_table =3D of_match_ptr(max597x_of_match), + }, + .probe =3D max597x_probe, +}; +module_i2c_driver(max597x_driver); + +MODULE_AUTHOR("Patrick Rudolph "); +MODULE_DESCRIPTION("MAX597X Power Switch and Monitor"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/mfd/max597x.h b/include/linux/mfd/max597x.h new file mode 100644 index 000000000000..99a047e66b44 --- /dev/null +++ b/include/linux/mfd/max597x.h @@ -0,0 +1,103 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Maxim MAX5970/MAX5978 Power Switch & Monitor + * + * Copyright (c) 2022 9elements GmbH + * + * Author: Patrick Rudolph + */ + +#ifndef MFD_MAX597X_H +#define MFD_MAX597X_H + +#include +#include + +/* Number of switch based on chip variant */ +#define MAX5970_NUM_SWITCHES 2 +#define MAX5978_NUM_SWITCHES 1 +/* Both chip variant have 4 indication LEDs used by LED cell */ +#define MAX597X_NUM_LEDS 4 + +enum max597x_chip_type { + MAX597x_TYPE_MAX5978 =3D 1, + MAX597x_TYPE_MAX5970, +}; + +#define MAX5970_REG_CURRENT_L(ch) (0x01 + (ch) * 4) +#define MAX5970_REG_CURRENT_H(ch) (0x00 + (ch) * 4) +#define MAX5970_REG_VOLTAGE_L(ch) (0x03 + (ch) * 4) +#define MAX5970_REG_VOLTAGE_H(ch) (0x02 + (ch) * 4) +#define MAX5970_REG_MON_RANGE 0x18 +#define MAX5970_MON_MASK 0x3 +#define MAX5970_MON(reg, ch) (((reg) >> ((ch) * 2)) & MAX5970_MON_MASK) +#define MAX5970_MON_MAX_RANGE_UV 16000000 + +#define MAX5970_REG_CH_UV_WARN_H(ch) (0x1A + (ch) * 10) +#define MAX5970_REG_CH_UV_WARN_L(ch) (0x1B + (ch) * 10) +#define MAX5970_REG_CH_UV_CRIT_H(ch) (0x1C + (ch) * 10) +#define MAX5970_REG_CH_UV_CRIT_L(ch) (0x1D + (ch) * 10) +#define MAX5970_REG_CH_OV_WARN_H(ch) (0x1E + (ch) * 10) +#define MAX5970_REG_CH_OV_WARN_L(ch) (0x1F + (ch) * 10) +#define MAX5970_REG_CH_OV_CRIT_H(ch) (0x20 + (ch) * 10) +#define MAX5970_REG_CH_OV_CRIT_L(ch) (0x21 + (ch) * 10) + +#define MAX5970_VAL2REG_H(x) (((x) >> 2) & 0xFF) +#define MAX5970_VAL2REG_L(x) ((x) & 0x3) + +#define MAX5970_REG_DAC_FAST(ch) (0x2E + (ch)) + +#define MAX5970_FAST2SLOW_RATIO 200 + +#define MAX5970_REG_STATUS0 0x31 +#define MAX5970_CB_IFAULTF(ch) (1 << (ch)) +#define MAX5970_CB_IFAULTS(ch) (1 << ((ch) + 4)) + +#define MAX5970_REG_STATUS1 0x32 +#define STATUS1_PROT_MASK 0x3 +#define STATUS1_PROT(reg) \ + (((reg) >> 6) & STATUS1_PROT_MASK) +#define STATUS1_PROT_SHUTDOWN 0 +#define STATUS1_PROT_CLEAR_PG 1 +#define STATUS1_PROT_ALERT_ONLY 2 + +#define MAX5970_REG_STATUS2 0x33 +#define MAX5970_IRNG_MASK 0x3 +#define MAX5970_IRNG(reg, ch) \ + (((reg) >> ((ch) * 2)) & MAX5970_IRNG_MASK) + +#define MAX5970_REG_STATUS3 0x34 +#define MAX5970_STATUS3_ALERT BIT(4) +#define MAX5970_STATUS3_PG(ch) BIT(ch) + +#define MAX5970_REG_FAULT0 0x35 +#define UV_STATUS_WARN(ch) BIT(ch) +#define UV_STATUS_CRIT(ch) BIT(ch + 4) + +#define MAX5970_REG_FAULT1 0x36 +#define OV_STATUS_WARN(ch) BIT(ch) +#define OV_STATUS_CRIT(ch) BIT(ch + 4) + +#define MAX5970_REG_FAULT2 0x37 +#define OC_STATUS_WARN(ch) BIT(ch) + +#define MAX5970_REG_CHXEN 0x3b +#define CHXEN(ch) (3 << (ch * 2)) + +#define MAX5970_REG_LED_FLASH 0x43 + +#define MAX_REGISTERS 0x49 +#define ADC_MASK 0x3FF + +struct max597x_data { + struct device *dev; + int irq; + int num_switches; + struct regmap *regmap; + /* Chip specific parameters needed by regulator & iio cells */ + u32 irng[MAX5970_NUM_SWITCHES]; + u32 mon_rng[MAX5970_NUM_SWITCHES]; + u32 shunt_micro_ohms[MAX5970_NUM_SWITCHES]; +}; + +#endif \ No newline at end of file --=20 2.37.3