Mon, May 06, 2024 at 05:08:29PM +0200, Johan Hovold kirjoitti: > From: Satya Priya <quic_c_skakit@xxxxxxxxxxx> > > Qualcomm Technologies, Inc. PM8008 is an I2C-controlled PMIC containing > seven LDO regulators. Add a PM8008 regulator driver to support PMIC > regulator management via the regulator framework. > > Note that this driver, originally submitted by Satya Priya [1], has been > reworked to match the new devicetree binding which no longer describes > each regulator as a separate device. > > This avoids describing internal details like register offsets in the > devicetree and allows for extending the implementation with features > like over-current protection without having to update the binding. > > Specifically note that the regulator interrupts are shared between all > regulators. > > Note that the secondary regmap is looked up by name and that if the > driver ever needs to be generalised to support regulators provided by > the primary regmap (I2C address) such information could be added to a > driver lookup table matching on the parent compatible. > > This also fixes the original implementation, which looked up regulators > by 'regulator-name' property rather than devicetree node name and which > prevented the regulators from being named to match board schematics. > [1] https://lore.kernel.org/r/1655200111-18357-8-git-send-email-quic_c_skakit@xxxxxxxxxxx Make it Link: tag? Link: URL [1] ... > [ johan: rework probe to match new binding, amend commit message and > Kconfig entry] Wouldn't be better on one line? ... + array_size.h + bits.h > +#include <linux/device.h> > +#include <linux/kernel.h> What is this header for? + math.h > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > +#include <linux/regulator/driver.h> + asm/byteorder.h ... > +static int pm8008_regulator_get_voltage(struct regulator_dev *rdev) > +{ > + struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev); > + __le16 mV; > + int uV; > + > + regmap_bulk_read(pm8008_reg->regmap, > + LDO_VSET_LB_REG(pm8008_reg->base), (void *)&mV, 2); Why casting? > + uV = le16_to_cpu(mV) * 1000; > + return (uV - pm8008_reg->rdesc.min_uV) / pm8008_reg->rdesc.uV_step; > +} > + > +static inline int pm8008_write_voltage(struct pm8008_regulator *pm8008_reg, > + int mV) > +{ > + __le16 vset_raw; > + > + vset_raw = cpu_to_le16(mV); Can be joined to a single line. > + return regmap_bulk_write(pm8008_reg->regmap, > + LDO_VSET_LB_REG(pm8008_reg->base), > + (const void *)&vset_raw, sizeof(vset_raw)); Why casting? > +} ... > +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; > + > + rc = regulator_list_voltage_linear_range(rdev, selector); > + if (rc < 0) > + return rc; > + > + /* voltage control register is set with voltage in millivolts */ > + mV = DIV_ROUND_UP(rc, 1000); > + rc = pm8008_write_voltage(pm8008_reg, mV); > + if (rc < 0) > + return rc; > + > + return 0; return pm8008_write_voltage(pm8008_reg, mV); ? > +} > + > + regmap = dev_get_regmap(dev->parent, "secondary"); > + if (!regmap) > + return -EINVAL; > + > + for (i = 0; i < ARRAY_SIZE(reg_data); i++) { > + pm8008_reg = devm_kzalloc(dev, sizeof(*pm8008_reg), GFP_KERNEL); > + if (!pm8008_reg) > + return -ENOMEM; > + > + pm8008_reg->regmap = regmap; > + pm8008_reg->base = reg_data[i].base; > + > + /* get slew rate */ > + rc = regmap_bulk_read(pm8008_reg->regmap, > + LDO_STEPPER_CTL_REG(pm8008_reg->base), &val, 1); > + if (rc < 0) { > + dev_err(dev, "failed to read step rate: %d\n", rc); > + return rc; return dev_err_probe(...); > + } > + val &= STEP_RATE_MASK; > + pm8008_reg->step_rate = DEFAULT_VOLTAGE_STEPPER_RATE >> val; > + rdesc = &pm8008_reg->rdesc; > + rdesc->type = REGULATOR_VOLTAGE; > + rdesc->ops = &pm8008_regulator_ops; > + rdesc->name = reg_data[i].name; > + rdesc->supply_name = reg_data[i].supply_name; > + rdesc->of_match = reg_data[i].name; > + rdesc->uV_step = VSET_STEP_UV; > + rdesc->linear_ranges = reg_data[i].voltage_range; > + rdesc->n_linear_ranges = 1; > + BUILD_BUG_ON((ARRAY_SIZE(pldo_ranges) != 1) || > + (ARRAY_SIZE(nldo_ranges) != 1)); > + > + if (reg_data[i].voltage_range == nldo_ranges) { > + rdesc->min_uV = NLDO_MIN_UV; > + rdesc->n_voltages = ((NLDO_MAX_UV - NLDO_MIN_UV) / rdesc->uV_step) + 1; > + } else { > + rdesc->min_uV = PLDO_MIN_UV; > + rdesc->n_voltages = ((PLDO_MAX_UV - PLDO_MIN_UV) / rdesc->uV_step) + 1; > + } > + > + rdesc->enable_reg = LDO_ENABLE_REG(pm8008_reg->base); > + rdesc->enable_mask = ENABLE_BIT; > + rdesc->min_dropout_uV = reg_data[i].min_dropout_uv; > + rdesc->regulators_node = of_match_ptr("regulators"); > + > + reg_config.dev = dev->parent; > + reg_config.driver_data = pm8008_reg; > + reg_config.regmap = pm8008_reg->regmap; > + > + rdev = devm_regulator_register(dev, rdesc, ®_config); > + if (IS_ERR(rdev)) { > + rc = PTR_ERR(rdev); > + dev_err(dev, "failed to register regulator %s: %d\n", > + reg_data[i].name, rc); > + return rc; return dev_err_probe(...); > + } > + } > + > + return 0; > +} ... > +static struct platform_driver pm8008_regulator_driver = { > + .driver = { > + .name = "qcom-pm8008-regulator", > + }, > + .probe = pm8008_regulator_probe, > +}; > + Unneeded blank line. > +module_platform_driver(pm8008_regulator_driver); ... > +MODULE_ALIAS("platform:qcom-pm8008-regulator"); Use ID table instead. -- With Best Regards, Andy Shevchenko
