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[23.128.96.18]) by mx.google.com with ESMTP id z15si6553882pgu.404.2021.09.30.21.04.17; Thu, 30 Sep 2021 21:04:32 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238121AbhJAED2 (ORCPT + 99 others); Fri, 1 Oct 2021 00:03:28 -0400 Received: from alexa-out.qualcomm.com ([129.46.98.28]:22391 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230437AbhJAEDY (ORCPT ); Fri, 1 Oct 2021 00:03:24 -0400 Received: from ironmsg-lv-alpha.qualcomm.com ([10.47.202.13]) by alexa-out.qualcomm.com with ESMTP; 30 Sep 2021 21:01:39 -0700 X-QCInternal: smtphost Received: from ironmsg02-blr.qualcomm.com ([10.86.208.131]) by ironmsg-lv-alpha.qualcomm.com with ESMTP/TLS/AES256-SHA; 30 Sep 2021 21:01:37 -0700 X-QCInternal: smtphost Received: from c-skakit-linux.ap.qualcomm.com (HELO c-skakit-linux.qualcomm.com) ([10.242.51.242]) by ironmsg02-blr.qualcomm.com with ESMTP; 01 Oct 2021 09:31:17 +0530 Received: by c-skakit-linux.qualcomm.com (Postfix, from userid 2344709) id 38FFA551B; Fri, 1 Oct 2021 09:31:16 +0530 (IST) From: Satya Priya To: Bjorn Andersson , Rob Herring Cc: Lee Jones , Liam Girdwood , Mark Brown , Das Srinagesh , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, mka@chromium.org, swboyd@chromium.org, collinsd@codeurora.org, subbaram@codeaurora.org, kgunda@codeaurora.org, satya priya Subject: [PATCH V2 3/4] regulator: Add a regulator driver for the PM8008 PMIC Date: Fri, 1 Oct 2021 09:30:58 +0530 Message-Id: <1633060859-22969-4-git-send-email-skakit@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1633060859-22969-1-git-send-email-skakit@codeaurora.org> References: <1633060859-22969-1-git-send-email-skakit@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: satya priya 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. drivers/regulator/Kconfig | 9 + drivers/regulator/Makefile | 1 + drivers/regulator/qcom-pm8008-regulator.c | 320 ++++++++++++++++++++++++++++++ 3 files changed, 330 insertions(+) create mode 100644 drivers/regulator/qcom-pm8008-regulator.c diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 27578e9..95d234f 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -916,6 +916,15 @@ 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 9e382b5..5e935ff 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -100,6 +100,7 @@ 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..5dacaa4 --- /dev/null +++ b/drivers/regulator/qcom-pm8008-regulator.c @@ -0,0 +1,320 @@ +// 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 +#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 STEP_RATE_MASK GENMASK(1, 0) + +#define PM8008_MAX_LDO 7 + +struct regulator_data { + char *name; + char *supply_name; + int min_uv; + int max_uv; + int min_dropout_uv; +}; + +struct pm8008_regulator { + struct device *dev; + struct regmap *regmap; + struct regulator_desc rdesc; + struct regulator_dev *rdev; + struct device_node *of_node; + u16 base; + int step_rate; +}; + +static const struct regulator_data reg_data[PM8008_MAX_LDO] = { + /* name parent min_uv max_uv headroom_uv */ + {"l1", "vdd_l1_l2", 528000, 1504000, 225000}, + {"l2", "vdd_l1_l2", 528000, 1504000, 225000}, + {"l3", "vdd_l3_l4", 1504000, 3400000, 200000}, + {"l4", "vdd_l3_l4", 1504000, 3400000, 200000}, + {"l5", "vdd_l5", 1504000, 3400000, 300000}, + {"l6", "vdd_l6", 1504000, 3400000, 300000}, + {"l7", "vdd_l7", 1504000, 3400000, 300000}, +}; + +static int pm8008_read(struct regmap *regmap, u16 reg, u8 *val, int count) +{ + int rc; + + rc = regmap_bulk_read(regmap, reg, val, count); + if (rc < 0) + pr_err("failed to read %#x, rc=%d\n", reg, rc); + + return rc; +} + +static int pm8008_write(struct regmap *regmap, u16 reg, u8 *val, int count) +{ + int rc; + + pr_debug("Writing [%*ph] from address %#x\n", count, val, reg); + rc = regmap_bulk_write(regmap, reg, val, count); + if (rc < 0) + pr_err("failed to write %#x rc=%d\n", reg, rc); + + return rc; +} + +static int pm8008_regulator_get_voltage(struct regulator_dev *rdev) +{ + struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev); + u8 vset_raw[2]; + int rc; + + rc = pm8008_read(pm8008_reg->regmap, + LDO_VSET_LB_REG(pm8008_reg->base), + vset_raw, 2); + if (rc < 0) { + dev_err(pm8008_reg->dev, "failed to read regulator voltage rc=%d\n", rc); + return rc; + } + + return (vset_raw[1] << 8 | vset_raw[0]) * 1000; +} + +static inline int pm8008_write_voltage(struct pm8008_regulator *pm8008_reg, int min_uv, + int max_uv) +{ + int rc = 0, mv; + u8 vset_raw[2]; + + mv = DIV_ROUND_UP(min_uv, 1000); + + /* + * Each LSB of regulator is 1mV and the voltage setpoint + * should be multiple of 8mV(step). + */ + mv = DIV_ROUND_UP(mv, VSET_STEP_MV) * VSET_STEP_MV; + if (mv * 1000 > max_uv) { + dev_err(pm8008_reg->dev, + "requested voltage (%d uV) above maximum limit (%d uV)\n", + mv*1000, max_uv); + return -EINVAL; + } + + vset_raw[0] = mv & 0xff; + vset_raw[1] = (mv & 0xff00) >> 8; + rc = pm8008_write(pm8008_reg->regmap, LDO_VSET_LB_REG(pm8008_reg->base), + vset_raw, 2); + 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, + int min_uv, int max_uv, unsigned int *selector) +{ + struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev); + int rc; + + rc = pm8008_write_voltage(pm8008_reg, min_uv, max_uv); + if (rc < 0) + return rc; + + *selector = DIV_ROUND_UP(min_uv - pm8008_reg->rdesc.min_uV, + VSET_STEP_UV); + + dev_dbg(pm8008_reg->dev, "voltage set to %d\n", min_uv); + 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 = 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_register_ldo(struct pm8008_regulator *pm8008_reg, + const char *name) +{ + struct regulator_config reg_config = {}; + struct regulator_init_data *init_data; + struct device *dev = pm8008_reg->dev; + struct device_node *reg_node = pm8008_reg->of_node; + int rc, i; + u32 base = 0; + u8 reg; + + /* get regulator data */ + for (i = 0; i < PM8008_MAX_LDO; i++) + if (strstr(name, reg_data[i].name)) + break; + + if (i == PM8008_MAX_LDO) { + dev_err(dev, "Invalid regulator name %s\n", name); + return -EINVAL; + } + + rc = of_property_read_u32(reg_node, "reg", &base); + if (rc < 0) { + dev_err(dev, "%s: failed to get regulator base rc=%d\n", name, rc); + return rc; + } + pm8008_reg->base = base; + + /* get slew rate */ + rc = pm8008_read(pm8008_reg->regmap, + LDO_STEPPER_CTL_REG(pm8008_reg->base), ®, 1); + if (rc < 0) { + dev_err(dev, "%s: failed to read step rate configuration rc=%d\n", + name, rc); + return rc; + } + pm8008_reg->step_rate = 38400 >> (reg & STEP_RATE_MASK); + + init_data = of_get_regulator_init_data(dev, reg_node, + &pm8008_reg->rdesc); + if (init_data == NULL) { + dev_err(dev, "%s: failed to get regulator data\n", name); + return -ENODATA; + } + + init_data->constraints.input_uV = init_data->constraints.max_uV; + reg_config.dev = dev; + reg_config.init_data = init_data; + reg_config.driver_data = pm8008_reg; + reg_config.of_node = reg_node; + + pm8008_reg->rdesc.type = REGULATOR_VOLTAGE; + pm8008_reg->rdesc.ops = &pm8008_regulator_ops; + pm8008_reg->rdesc.name = init_data->constraints.name; + pm8008_reg->rdesc.supply_name = reg_data[i].supply_name; + pm8008_reg->rdesc.uV_step = VSET_STEP_UV; + pm8008_reg->rdesc.min_uV = reg_data[i].min_uv; + pm8008_reg->rdesc.n_voltages + = ((reg_data[i].max_uv - reg_data[i].min_uv) + / pm8008_reg->rdesc.uV_step) + 1; + + pm8008_reg->rdesc.enable_reg = LDO_ENABLE_REG(base); + pm8008_reg->rdesc.enable_mask = ENABLE_BIT; + pm8008_reg->rdesc.min_dropout_uV = reg_data[i].min_dropout_uv; + of_property_read_u32(reg_node, "qcom,min-dropout-voltage", + &pm8008_reg->rdesc.min_dropout_uV); + + pm8008_reg->rdev = devm_regulator_register(dev, &pm8008_reg->rdesc, + ®_config); + if (IS_ERR(pm8008_reg->rdev)) { + rc = PTR_ERR(pm8008_reg->rdev); + dev_err(dev, "%s: failed to register regulator rc=%d\n", + pm8008_reg->rdesc.name, rc); + return rc; + } + + dev_dbg(dev, "%s regulator registered\n", name); + + return 0; +} + +static int pm8008_parse_regulator(struct regmap *regmap, struct device *dev) +{ + int rc = 0; + const char *name; + struct device_node *child; + struct pm8008_regulator *pm8008_reg; + + /* parse each subnode and register regulator for regulator child */ + for_each_available_child_of_node(dev->of_node, child) { + pm8008_reg = devm_kzalloc(dev, sizeof(*pm8008_reg), GFP_KERNEL); + + pm8008_reg->regmap = regmap; + pm8008_reg->of_node = child; + pm8008_reg->dev = dev; + + rc = of_property_read_string(child, "regulator-name", &name); + if (rc) + continue; + + rc = pm8008_register_ldo(pm8008_reg, name); + if (rc < 0) { + dev_err(dev, "failed to register regulator %s rc=%d\n", + name, rc); + return rc; + } + } + + return 0; +} + +static int pm8008_regulator_probe(struct platform_device *pdev) +{ + int rc = 0; + struct regmap *regmap; + + regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!regmap) { + dev_err(&pdev->dev, "parent regmap is missing\n"); + return -EINVAL; + } + + rc = pm8008_parse_regulator(regmap, &pdev->dev); + if (rc < 0) { + dev_err(&pdev->dev, "failed to parse device tree rc=%d\n", rc); + return rc; + } + + return 0; +} + +static const struct of_device_id pm8008_regulator_match_table[] = { + { .compatible = "qcom,pm8008-regulator", }, + { }, +}; + +static struct platform_driver pm8008_regulator_driver = { + .driver = { + .name = "qcom,pm8008-regulator", + .of_match_table = pm8008_regulator_match_table, + }, + .probe = pm8008_regulator_probe, +}; + +module_platform_driver(pm8008_regulator_driver); + +MODULE_DESCRIPTION("Qualcomm PM8008 PMIC Regulator Driver"); +MODULE_LICENSE("GPL v2"); -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation