From patchwork Tue Feb 8 14:52:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Satya Priya Kakitapalli (Temp)" X-Patchwork-Id: 12738834 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 1FAD3C433FE for ; Tue, 8 Feb 2022 14:55:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1378812AbiBHOzP (ORCPT ); Tue, 8 Feb 2022 09:55:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47928 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1378708AbiBHOzI (ORCPT ); Tue, 8 Feb 2022 09:55:08 -0500 Received: from alexa-out.qualcomm.com (alexa-out.qualcomm.com [129.46.98.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C0825C06129A; Tue, 8 Feb 2022 06:55:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1644332104; x=1675868104; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=l4EFA2CQpRuZZAiL84oacUgBJvJHgljqKjqQu++slRU=; b=ZqK0I0VtuHbKjipfO9L+rK+lFEy0sgrQLlens3eW0Q67GC042/I7QD/J +toolmARys87qBeY1CUr4wl+9LaX6hN6WhvqLwxQFW9m7lHjmWh+PAnpG gsqrZomWUhNZwtIr7SAYvZOD1UeX7P5jSdlIIfjndSwixDp+95jzrQFa7 8=; Received: from ironmsg-lv-alpha.qualcomm.com ([10.47.202.13]) by alexa-out.qualcomm.com with ESMTP; 08 Feb 2022 06:55:03 -0800 X-QCInternal: smtphost Received: from nasanex01c.na.qualcomm.com ([10.47.97.222]) by ironmsg-lv-alpha.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Feb 2022 06:55:03 -0800 Received: from nalasex01a.na.qualcomm.com (10.47.209.196) by nasanex01c.na.qualcomm.com (10.47.97.222) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.922.19; Tue, 8 Feb 2022 06:55:03 -0800 Received: from c-skakit-linux.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.922.19; Tue, 8 Feb 2022 06:54:58 -0800 From: Satya Priya To: Bjorn Andersson , Rob Herring , Krzysztof Kozlowski CC: Lee Jones , Liam Girdwood , Mark Brown , Das Srinagesh , , , , , , , , Satya Priya Subject: [PATCH V5 4/6] regulator: Add a regulator driver for the PM8008 PMIC Date: Tue, 8 Feb 2022 20:22:18 +0530 Message-ID: <1644331940-18986-5-git-send-email-quic_c_skakit@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1644331940-18986-1-git-send-email-quic_c_skakit@quicinc.com> References: <1644331940-18986-1-git-send-email-quic_c_skakit@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Qualcomm Technologies, Inc. PM8008 is an I2C controlled PMIC containing 7 LDO regulators. Add a PM8008 regulator driver to support PMIC regulator management via the regulator framework. Signed-off-by: Satya Priya --- Changes in V2: As per Mark's comments - Using regmap helpers for regulator enable/disable and is_enabled APIs - Changed pr_err to dev_err wherever possible. - Removed init_voltage property as it is not used. - Removed if check for registering LDOs - Other minor changes. Changes in V3: As per Stephen's comments, - Removed unused includes - Removed PM8008_MAX_LDO macro. - Removed pm8008_read/write APIs, using regmap_bulk_read/write APIs - Using le16_to_cpu/cpu_to_le16 APIs in pm8008_regulator_get/set_voltage - Consolidated all probe related functions into single probe function. - Added of_parse_cb call back and removed regulator-name matching loop. - Fixed other minor nits. Changes in V4: - Removed unused members like rdev and of_node from pm8008_regulator struct. - Replaced set_voltage with set_voltage_sel - Removed init_data configuration as it is not needed. - Removed few other unused assignments from probe Changes in V5: - Removed Compatible string. - Changed the probe function accordingly to probe LDOs using mfd driver. - Added max headrooms for LDOs and removed the part reading min-dropout from DT. - Added base reg values in the regulator_data struct instead of reading it from DT. drivers/regulator/Kconfig | 9 ++ drivers/regulator/Makefile | 1 + drivers/regulator/qcom-pm8008-regulator.c | 234 ++++++++++++++++++++++++++++++ 3 files changed, 244 insertions(+) create mode 100644 drivers/regulator/qcom-pm8008-regulator.c diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 22503e4..4372ad7 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -925,6 +925,15 @@ config REGULATOR_PWM This driver supports PWM controlled voltage regulators. PWM duty cycle can increase or decrease the voltage. +config REGULATOR_QCOM_PM8008 + tristate "Qualcomm Technologies, Inc. PM8008 PMIC regulators" + depends on MFD_QCOM_PM8008 + help + Select this option to get support for the voltage regulators + of Qualcomm Technologies, Inc. PM8008 PMIC chip. PM8008 has 7 LDO + regulators. This driver provides support for basic operations like + set/get voltage and enable/disable. + config REGULATOR_QCOM_RPM tristate "Qualcomm RPM regulator driver" depends on MFD_QCOM_RPM diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 2e1b087..9ab3ad7 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -101,6 +101,7 @@ obj-$(CONFIG_REGULATOR_MT6380) += mt6380-regulator.o obj-$(CONFIG_REGULATOR_MT6397) += mt6397-regulator.o obj-$(CONFIG_REGULATOR_MTK_DVFSRC) += mtk-dvfsrc-regulator.o obj-$(CONFIG_REGULATOR_QCOM_LABIBB) += qcom-labibb-regulator.o +obj-$(CONFIG_REGULATOR_QCOM_PM8008) += qcom-pm8008-regulator.o obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o obj-$(CONFIG_REGULATOR_QCOM_RPMH) += qcom-rpmh-regulator.o obj-$(CONFIG_REGULATOR_QCOM_SMD_RPM) += qcom_smd-regulator.o diff --git a/drivers/regulator/qcom-pm8008-regulator.c b/drivers/regulator/qcom-pm8008-regulator.c new file mode 100644 index 0000000..86043b4 --- /dev/null +++ b/drivers/regulator/qcom-pm8008-regulator.c @@ -0,0 +1,234 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2021, The Linux Foundation. All rights reserved. */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define STARTUP_DELAY_USEC 20 +#define VSET_STEP_MV 8 +#define VSET_STEP_UV (VSET_STEP_MV * 1000) + +#define LDO_ENABLE_REG(base) ((base) + 0x46) +#define ENABLE_BIT BIT(7) + +#define LDO_STATUS1_REG(base) ((base) + 0x08) +#define VREG_READY_BIT BIT(7) + +#define LDO_VSET_LB_REG(base) ((base) + 0x40) + +#define LDO_STEPPER_CTL_REG(base) ((base) + 0x3b) +#define DEFAULT_VOLTAGE_STEPPER_RATE 38400 +#define STEP_RATE_MASK GENMASK(1, 0) + +#define PM8008_NUM_LDOS 7 + +struct regulator_data { + const char *name; + const char *supply_name; + u16 base; + int min_uv; + int max_uv; + int min_dropout_uv; + const struct linear_range *voltage_range; +}; + +struct pm8008_regulator { + struct device *dev; + struct regmap *regmap; + struct regulator_desc rdesc; + u16 base; + int step_rate; +}; + +static const struct linear_range nldo_ranges[] = { + REGULATOR_LINEAR_RANGE(528000, 0, 122, 8000), +}; + +static const struct linear_range pldo_ranges[] = { + REGULATOR_LINEAR_RANGE(1504000, 0, 237, 8000), +}; + +static const struct regulator_data reg_data[] = { + /* name parent base min_uv max_uv headroom_uv voltage_range */ + { "LDO1", "vdd_l1_l2", 0x4000, 528000, 1504000, 225000, nldo_ranges, }, + { "LDO2", "vdd_l1_l2", 0x4100, 528000, 1504000, 225000, nldo_ranges, }, + { "LDO3", "vdd_l3_l4", 0x4200, 1504000, 3400000, 300000, pldo_ranges, }, + { "LDO4", "vdd_l3_l4", 0x4300, 1504000, 3400000, 300000, pldo_ranges, }, + { "LDO5", "vdd_l5", 0x4400, 1504000, 3400000, 200000, pldo_ranges, }, + { "LDO6", "vdd_l6", 0x4500, 1504000, 3400000, 200000, pldo_ranges, }, + { "LDO7", "vdd_l7", 0x4600, 1504000, 3400000, 200000, pldo_ranges, }, +}; + +static int pm8008_regulator_get_voltage(struct regulator_dev *rdev) +{ + struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev); + __le16 mV; + int rc; + + rc = regmap_bulk_read(pm8008_reg->regmap, + LDO_VSET_LB_REG(pm8008_reg->base), (void *)&mV, 2); + if (rc < 0) { + dev_err(&rdev->dev, "failed to read regulator voltage rc=%d\n", rc); + return rc; + } + + return le16_to_cpu(mV) * 1000; +} + +static inline int pm8008_write_voltage(struct pm8008_regulator *pm8008_reg, + int mV) +{ + int rc; + u16 vset_raw; + + vset_raw = cpu_to_le16(mV); + + rc = regmap_bulk_write(pm8008_reg->regmap, + LDO_VSET_LB_REG(pm8008_reg->base), + (const void *)&vset_raw, sizeof(vset_raw)); + if (rc < 0) { + dev_err(pm8008_reg->dev, "failed to write voltage rc=%d\n", rc); + return rc; + } + + return 0; +} + +static int pm8008_regulator_set_voltage_time(struct regulator_dev *rdev, + int old_uV, int new_uv) +{ + struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev); + + return DIV_ROUND_UP(abs(new_uv - old_uV), pm8008_reg->step_rate); +} + +static int pm8008_regulator_set_voltage(struct regulator_dev *rdev, + unsigned int selector) +{ + struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev); + int rc, mV; + + /* voltage control register is set with voltage in millivolts */ + mV = DIV_ROUND_UP(regulator_list_voltage_linear_range(rdev, selector), + 1000); + if (mV < 0) + return mV; + + rc = pm8008_write_voltage(pm8008_reg, mV); + if (rc < 0) + return rc; + + dev_dbg(&rdev->dev, "voltage set to %d\n", mV * 1000); + return 0; +} + +static const struct regulator_ops pm8008_regulator_ops = { + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + .set_voltage_sel = pm8008_regulator_set_voltage, + .get_voltage = pm8008_regulator_get_voltage, + .list_voltage = regulator_list_voltage_linear, + .set_voltage_time = pm8008_regulator_set_voltage_time, +}; + +static int pm8008_regulator_of_parse(struct device_node *node, + const struct regulator_desc *desc, + struct regulator_config *config) +{ + struct pm8008_regulator *pm8008_reg = config->driver_data; + int rc; + unsigned int reg; + + /* get slew rate */ + rc = regmap_bulk_read(pm8008_reg->regmap, + LDO_STEPPER_CTL_REG(pm8008_reg->base), ®, 1); + if (rc < 0) { + dev_err(pm8008_reg->dev, + "%s: failed to read step rate configuration rc=%d\n", + pm8008_reg->rdesc.name, rc); + return rc; + } + reg &= STEP_RATE_MASK; + pm8008_reg->step_rate = DEFAULT_VOLTAGE_STEPPER_RATE >> reg; + + return 0; +} + +static int pm8008_regulator_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + int id = pdev->id % PM8008_NUM_LDOS; + struct regulator_dev *rdev; + struct pm8008_regulator *pm8008_reg; + struct regmap *regmap; + struct regulator_config reg_config = {}; + int rc; + + dev_dbg(dev, "DEBUG: Probing LDO%d\n", id + 1); + + regmap = dev_get_regmap(dev->parent, NULL); + if (!regmap) { + dev_err(dev, "parent regmap is missing\n"); + return -EINVAL; + } + + pm8008_reg = devm_kzalloc(dev, sizeof(*pm8008_reg), GFP_KERNEL); + if (!pm8008_reg) + return -ENOMEM; + + pm8008_reg->regmap = regmap; + pm8008_reg->dev = dev; + pm8008_reg->base = reg_data[id].base; + + pm8008_reg->rdesc.type = REGULATOR_VOLTAGE; + pm8008_reg->rdesc.regulators_node = of_match_ptr("regulators"); + pm8008_reg->rdesc.ops = &pm8008_regulator_ops; + pm8008_reg->rdesc.name = reg_data[id].name; + pm8008_reg->rdesc.supply_name = reg_data[id].supply_name; + pm8008_reg->rdesc.of_match = reg_data[id].name; + pm8008_reg->rdesc.of_parse_cb = pm8008_regulator_of_parse; + pm8008_reg->rdesc.uV_step = VSET_STEP_UV; + pm8008_reg->rdesc.min_uV = reg_data[id].min_uv; + pm8008_reg->rdesc.n_voltages + = ((reg_data[id].max_uv - reg_data[id].min_uv) + / pm8008_reg->rdesc.uV_step) + 1; + pm8008_reg->rdesc.linear_ranges = reg_data[id].voltage_range; + pm8008_reg->rdesc.n_linear_ranges = 1; + pm8008_reg->rdesc.enable_reg = LDO_ENABLE_REG(pm8008_reg->base); + pm8008_reg->rdesc.enable_mask = ENABLE_BIT; + pm8008_reg->rdesc.min_dropout_uV = reg_data[id].min_dropout_uv; + + reg_config.dev = dev->parent; + reg_config.driver_data = pm8008_reg; + + rdev = devm_regulator_register(dev, &pm8008_reg->rdesc, ®_config); + if (IS_ERR(rdev)) { + rc = PTR_ERR(rdev); + dev_err(dev, "%s: failed to register regulator rc=%d\n", + reg_data[id].name, rc); + return rc; + } + + return 0; +} + +static struct platform_driver pm8008_regulator_driver = { + .driver = { + .name = "qcom,pm8008-regulators", + }, + .probe = pm8008_regulator_probe, +}; + +module_platform_driver(pm8008_regulator_driver); + +MODULE_DESCRIPTION("Qualcomm PM8008 PMIC Regulator Driver"); +MODULE_LICENSE("GPL");