From nobody Thu Apr 9 00:16:25 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 723BCECAAA1 for ; Mon, 31 Oct 2022 20:42:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229468AbiJaUmC (ORCPT ); Mon, 31 Oct 2022 16:42:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33688 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230012AbiJaUl6 (ORCPT ); Mon, 31 Oct 2022 16:41:58 -0400 Received: from mail-wr1-x42d.google.com (mail-wr1-x42d.google.com [IPv6:2a00:1450:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C973113E22 for ; Mon, 31 Oct 2022 13:41:54 -0700 (PDT) Received: by mail-wr1-x42d.google.com with SMTP id a14so17611300wru.5 for ; Mon, 31 Oct 2022 13:41:54 -0700 (PDT) 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=Eddshc+TxD4X+o0YuSoxkETZc7MLSHkFPfgjCwFMvTg=; b=R6KJPLeCN4i2l3tv3zJOif7cocU5fM0952poMYA0sd23SzML8MHYEyDaysWInulEKP qvYUgwO8dLerAvPLPGCNpFYNJiQU3RoBbn653TWVXlOK219s9M1eyBLN92viGGhF/v27 y2qgnDLPYCzRmG8ng5brZUcRwhxw9gMoRPtV6ED79hdmPz+Hdx4jGdhjUqNWL7W2kEme n9lamVPcr1XxId30Ejp5LAyBRqW5iV0UHwXLSGpJXa+2l0t4qEz7GMhZoGK0L5PLJfu9 JkYjKFHIS++48GjJTeEnm6Lrsbyws1EvukiOFQe/GWoh0qHuZtodViXK6xPnNBp/ZIjO Tgqw== 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=Eddshc+TxD4X+o0YuSoxkETZc7MLSHkFPfgjCwFMvTg=; b=zdHUuiyg2qYX3R/l0dY9lj2z7c/9iJgz2eQnzTXyv5f0enrMkEsrg5dx0LU1oqi5nM F7EMDMXwAFB0DbCvWc7doST55C89mDxYMF38hkEXJoQxof/m6eeJ4zT5TUjKn/9+/br+ TK9FLvnGuHNa70fjJsYsHSp/XPg+BMHn0IUXBMyL0OsSJC329XR9ihkZmbPzB8XZ5cj5 UVsDf9BMnFdxo8WrQUO7yDAG0wL57xk4WRTtaWYI7jSXQT2SBhCsxY/v4MNy3TX0oVzn Q2CTyVKFhvwseX8tEx2I81apm4M7p8cww3JMNiGRLZivRtZVMUZbENuAsb9P39h7T2Ie Ri9w== X-Gm-Message-State: ACrzQf1smoWwEDQjjSiqPRt9m510GWDf07+5JZ0CmIunzpYRjMENSvEK 4fOp7ARNEKgAUcsv3g+iX/swr/af5PY7bkPm X-Google-Smtp-Source: AMsMyM6crdIlNinOQ9l+ERcLuE45qfGFd+f5ZwVgeJzZicCL+Qw8byIGLAekKz86fqg8V0PSkIcPWA== X-Received: by 2002:adf:f609:0:b0:236:680b:8c65 with SMTP id t9-20020adff609000000b00236680b8c65mr9750950wrp.615.1667248913118; Mon, 31 Oct 2022 13:41:53 -0700 (PDT) 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 s12-20020a5d6a8c000000b002364c77bcacsm8012939wru.38.2022.10.31.13.41.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Oct 2022 13:41:52 -0700 (PDT) From: Naresh Solanki X-Google-Original-From: Naresh Solanki To: linux-kernel@vger.kernel.org, Lee Jones , Rob Herring , Krzysztof Kozlowski , Patrick Rudolph Cc: Marcello Sylvester Bauer , Naresh Solanki Subject: [PATCH v3 1/2] dt-bindings: mfd: Add bindings for MAX5970 and MAX5978 Date: Mon, 31 Oct 2022 21:41:29 +0100 Message-Id: <20221031204129.1434059-2-Naresh.Solanki@9elements.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221031204129.1434059-1-Naresh.Solanki@9elements.com> References: <20221031204129.1434059-1-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 --- .../devicetree/bindings/mfd/max5970.yaml | 164 ++++++++++++++++++ 1 file changed, 164 insertions(+) create mode 100644 Documentation/devicetree/bindings/mfd/max5970.yaml diff --git a/Documentation/devicetree/bindings/mfd/max5970.yaml b/Documenta= tion/devicetree/bindings/mfd/max5970.yaml new file mode 100644 index 000000000000..a0cc6a7543b5 --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/max5970.yaml @@ -0,0 +1,164 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mfd/max5970.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Regulator driver 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 single channel. + + patternProperties: + "^led@[0-3]$": + $ref: /schemas/leds/common.yaml# + type: object + + additionalProperties: true + + vss1-supply: + description: Supply of the first channel. + + "#io-channel-cells": + const: 1 + + regulators: + type: object + description: + Properties for single channel. + + patternProperties: + "^(sw[0-1])$": + $ref: /schemas/regulator/regulator.yaml# + type: object + + shunt-resistor-micro-ohms: + description: | + The value of curent sense resistor in microohms. + Must be specified for each channel. + + additionalProperties: true + +required: + - compatible + - reg + - regulators + - vss1-supply + +allOf: + - $ref: /schemas/regulator/regulator.yaml# + - if: + properties: + compatible: + enum: + - maxim,max5970 + then: + properties: + vss2-supply: + description: Supply of the second channel. + + 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>; + 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"; + }; + }; + regulator@3a { + reg =3D <0x3a>; + vss1-supply =3D <&p3v3>; + compatible =3D "maxim,max5978"; + + regulators { + sw0_ref_0: SW0 { + regulator-compatible =3D "SW0"; + shunt-resistor-micro-ohms =3D <12000>; + }; + }; + }; + }; + + - | + i2c { + #address-cells =3D <1>; + #size-cells =3D <0>; + + regulator@3a { + reg =3D <0x3a>; + vss1-supply =3D <&p3v3>; + vss2-supply =3D <&p5v>; + compatible =3D "maxim,max5970"; + + 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 Thu Apr 9 00:16:25 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 199D4FA3741 for ; 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[78.94.0.51]) by smtp.gmail.com with ESMTPSA id s12-20020a5d6a8c000000b002364c77bcacsm8012939wru.38.2022.10.31.13.41.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Oct 2022 13:41:54 -0700 (PDT) From: Naresh Solanki X-Google-Original-From: Naresh Solanki To: linux-kernel@vger.kernel.org, Lee Jones Cc: Patrick Rudolph , Marcello Sylvester Bauer , Naresh Solanki Subject: [PATCH v3 2/2] mfd: max597x: Add support for MAX5970 and MAX5978 Date: Mon, 31 Oct 2022 21:41:30 +0100 Message-Id: <20221031204129.1434059-3-Naresh.Solanki@9elements.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221031204129.1434059-1-Naresh.Solanki@9elements.com> References: <20221031204129.1434059-1-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 | 87 ++++++++++++++++++++++++++++++ include/linux/mfd/max597x.h | 102 ++++++++++++++++++++++++++++++++++++ 4 files changed, 202 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..68a4e7755f21 --- /dev/null +++ b/drivers/mfd/max597x.c @@ -0,0 +1,87 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Maxim MAX5970/MAX5978 MFD Driver + * + * 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); + + switch (chip) { + case MAX597x_TYPE_MAX5970: + ddata->num_switches =3D 2; + break; + case MAX597x_TYPE_MAX5978: + ddata->num_switches =3D 1; + break; + } + + ddata->regmap =3D devm_regmap_init_i2c(i2c, &max597x_regmap_config); + if (IS_ERR(ddata->regmap)) { + dev_err(&i2c->dev, "Failed to initialise regmap"); + return -EINVAL; + } + + /* 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..ae7f38f0aee2 --- /dev/null +++ b/include/linux/mfd/max597x.h @@ -0,0 +1,102 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Maxim MAX5970/MAX5978 MFD Driver + * + * Copyright (c) 2022 9elements GmbH + * + * Author: Patrick Rudolph + */ + +#ifndef MFD_MAX597X_H +#define MFD_MAX597X_H + +#include +#include + +#define MAX5970_NUM_SWITCHES 2 +#define MAX5978_NUM_SWITCHES 1 +#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 /* _MAX597X_H */ --=20 2.37.3