From 11ec7bf001e7bfd37f244042032e15dac2c301bc Mon Sep 17 00:00:00 2001 From: Thomas Abraham Date: Fri, 23 Nov 2012 13:33:13 +0530 Subject: regulator: max8997: reorder buck1/2/5 dvs setup code The BUCKxDVSx register programming is now moved prior to setting up of the gpio based dvs mode. This will ensure that all the BUCKxDVSx registers are programmed with appropriate voltage values before the gpio based dvs mode is selected for buck1/2/5. Signed-off-by: Thomas Abraham Reviewed-by: Tomasz Figa Signed-off-by: Mark Brown --- drivers/regulator/max8997.c | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) diff --git a/drivers/regulator/max8997.c b/drivers/regulator/max8997.c index e39a0c7..04d9f29 100644 --- a/drivers/regulator/max8997.c +++ b/drivers/regulator/max8997.c @@ -1019,6 +1019,19 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev) max_buck5, 0x3f); } + /* Initialize all the DVS related BUCK registers */ + for (i = 0; i < 8; i++) { + max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i, + max8997->buck1_vol[i], + 0x3f); + max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i, + max8997->buck2_vol[i], + 0x3f); + max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i, + max8997->buck5_vol[i], + 0x3f); + } + /* * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them. * If at least one of them cares, set gpios. @@ -1068,19 +1081,6 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev) max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ? (1 << 1) : (0 << 1), 1 << 1); - /* Initialize all the DVS related BUCK registers */ - for (i = 0; i < 8; i++) { - max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i, - max8997->buck1_vol[i], - 0x3f); - max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i, - max8997->buck2_vol[i], - 0x3f); - max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i, - max8997->buck5_vol[i], - 0x3f); - } - /* Misc Settings */ max8997->ramp_delay = 10; /* set 10mV/us, which is the default */ max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9); -- cgit v1.1 From 068a8c8239d50a5fd025c97f94945d9f2ffa3438 Mon Sep 17 00:00:00 2001 From: Thomas Abraham Date: Fri, 23 Nov 2012 13:33:14 +0530 Subject: regulator: max8997: limit the number of dvs registers programmed in non-dvs mode In case the gpio based volatage selection mode is not used for either of buck 1/2/5, then only the BUCKxDVS1 register need to be programmed. So determine whether dvs mode is used and limit the loop count appropriately. Signed-off-by: Thomas Abraham Reviewed-by: Tomasz Figa Signed-off-by: Mark Brown --- drivers/regulator/max8997.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/regulator/max8997.c b/drivers/regulator/max8997.c index 04d9f29..64cf2ee 100644 --- a/drivers/regulator/max8997.c +++ b/drivers/regulator/max8997.c @@ -941,7 +941,7 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev) struct regulator_dev **rdev; struct max8997_data *max8997; struct i2c_client *i2c; - int i, ret, size; + int i, ret, size, nr_dvs; u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0; if (!pdata) { @@ -973,7 +973,10 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev) memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3); max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect; - for (i = 0; i < 8; i++) { + nr_dvs = (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs || + pdata->buck5_gpiodvs) ? 8 : 1; + + for (i = 0; i < nr_dvs; i++) { max8997->buck1_vol[i] = ret = max8997_get_voltage_proper_val( &buck1245_voltage_map_desc, @@ -1020,7 +1023,7 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev) } /* Initialize all the DVS related BUCK registers */ - for (i = 0; i < 8; i++) { + for (i = 0; i < nr_dvs; i++) { max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i, max8997->buck1_vol[i], 0x3f); -- cgit v1.1 From 77b71b370ed06c75bdebef09be438d5275f70fc1 Mon Sep 17 00:00:00 2001 From: Thomas Abraham Date: Tue, 27 Nov 2012 14:04:32 +0530 Subject: regulator: add device tree support for max8997 Add device tree based discovery support for max8997. Signed-off-by: Thomas Abraham Acked-by: MyungJoo Ham Reviewed-by: Tomasz Figa Signed-off-by: Mark Brown --- .../bindings/regulator/max8997-regulator.txt | 146 ++++++++++++++++++++ drivers/mfd/max8997.c | 73 +++++++++- drivers/regulator/max8997.c | 148 ++++++++++++++++++++- include/linux/mfd/max8997-private.h | 1 + include/linux/mfd/max8997.h | 1 + 5 files changed, 366 insertions(+), 3 deletions(-) create mode 100644 Documentation/devicetree/bindings/regulator/max8997-regulator.txt diff --git a/Documentation/devicetree/bindings/regulator/max8997-regulator.txt b/Documentation/devicetree/bindings/regulator/max8997-regulator.txt new file mode 100644 index 0000000..9fd69a1 --- /dev/null +++ b/Documentation/devicetree/bindings/regulator/max8997-regulator.txt @@ -0,0 +1,146 @@ +* Maxim MAX8997 Voltage and Current Regulator + +The Maxim MAX8997 is a multi-function device which includes volatage and +current regulators, rtc, charger controller and other sub-blocks. It is +interfaced to the host controller using a i2c interface. Each sub-block is +addressed by the host system using different i2c slave address. This document +describes the bindings for 'pmic' sub-block of max8997. + +Required properties: +- compatible: Should be "maxim,max8997-pmic". +- reg: Specifies the i2c slave address of the pmic block. It should be 0x66. + +- max8997,pmic-buck1-dvs-voltage: A set of 8 voltage values in micro-volt (uV) + units for buck1 when changing voltage using gpio dvs. Refer to [1] below + for additional information. + +- max8997,pmic-buck2-dvs-voltage: A set of 8 voltage values in micro-volt (uV) + units for buck2 when changing voltage using gpio dvs. Refer to [1] below + for additional information. + +- max8997,pmic-buck5-dvs-voltage: A set of 8 voltage values in micro-volt (uV) + units for buck5 when changing voltage using gpio dvs. Refer to [1] below + for additional information. + +[1] If none of the 'max8997,pmic-buck[1/2/5]-uses-gpio-dvs' optional + property is specified, the 'max8997,pmic-buck[1/2/5]-dvs-voltage' + property should specify atleast one voltage level (which would be a + safe operating voltage). + + If either of the 'max8997,pmic-buck[1/2/5]-uses-gpio-dvs' optional + property is specified, then all the eigth voltage values for the + 'max8997,pmic-buck[1/2/5]-dvs-voltage' should be specified. + +Optional properties: +- interrupt-parent: Specifies the phandle of the interrupt controller to which + the interrupts from max8997 are delivered to. +- interrupts: Interrupt specifiers for two interrupt sources. + - First interrupt specifier is for 'irq1' interrupt. + - Second interrupt specifier is for 'alert' interrupt. +- max8997,pmic-buck1-uses-gpio-dvs: 'buck1' can be controlled by gpio dvs. +- max8997,pmic-buck2-uses-gpio-dvs: 'buck2' can be controlled by gpio dvs. +- max8997,pmic-buck5-uses-gpio-dvs: 'buck5' can be controlled by gpio dvs. + +Additional properties required if either of the optional properties are used: +- max8997,pmic-ignore-gpiodvs-side-effect: When GPIO-DVS mode is used for + multiple bucks, changing the voltage value of one of the bucks may affect + that of another buck, which is the side effect of the change (set_voltage). + Use this property to ignore such side effects and change the voltage. + +- max8997,pmic-buck125-default-dvs-idx: Default voltage setting selected from + the possible 8 options selectable by the dvs gpios. The value of this + property should be between 0 and 7. If not specified or if out of range, the + default value of this property is set to 0. + +- max8997,pmic-buck125-dvs-gpios: GPIO specifiers for three host gpio's used + for dvs. The format of the gpio specifier depends in the gpio controller. + +Regulators: The regulators of max8997 that have to be instantiated should be +included in a sub-node named 'regulators'. Regulator nodes included in this +sub-node should be of the format as listed below. + + regulator_name { + standard regulator bindings here + }; + +The following are the names of the regulators that the max8997 pmic block +supports. Note: The 'n' in LDOn and BUCKn represents the LDO or BUCK number +as per the datasheet of max8997. + + - LDOn + - valid values for n are 1 to 18 and 21 + - Example: LDO0, LD01, LDO2, LDO21 + - BUCKn + - valid values for n are 1 to 7. + - Example: BUCK1, BUCK2, BUCK3, BUCK7 + + - ENVICHG: Battery Charging Current Monitor Output. This is a fixed + voltage type regulator + + - ESAFEOUT1: (ldo19) + - ESAFEOUT2: (ld020) + + - CHARGER_CV: main battery charger voltage control + - CHARGER: main battery charger current control + - CHARGER_TOPOFF: end of charge current threshold level + +The bindings inside the regulator nodes use the standard regulator bindings +which are documented elsewhere. + +Example: + + max8997_pmic@66 { + compatible = "maxim,max8997-pmic"; + interrupt-parent = <&wakeup_eint>; + reg = <0x66>; + interrupts = <4 0>, <3 0>; + + max8997,pmic-buck1-uses-gpio-dvs; + max8997,pmic-buck2-uses-gpio-dvs; + max8997,pmic-buck5-uses-gpio-dvs; + + max8997,pmic-ignore-gpiodvs-side-effect; + max8997,pmic-buck125-default-dvs-idx = <0>; + + max8997,pmic-buck125-dvs-gpios = <&gpx0 0 1 0 0>, /* SET1 */ + <&gpx0 1 1 0 0>, /* SET2 */ + <&gpx0 2 1 0 0>; /* SET3 */ + + max8997,pmic-buck1-dvs-voltage = <1350000>, <1300000>, + <1250000>, <1200000>, + <1150000>, <1100000>, + <1000000>, <950000>; + + max8997,pmic-buck2-dvs-voltage = <1100000>, <1100000>, + <1100000>, <1100000>, + <1000000>, <1000000>, + <1000000>, <1000000>; + + max8997,pmic-buck5-dvs-voltage = <1200000>, <1200000>, + <1200000>, <1200000>, + <1200000>, <1200000>, + <1200000>, <1200000>; + + regulators { + ldo1_reg: LDO1 { + regulator-name = "VDD_ABB_3.3V"; + regulator-min-microvolt = <3300000>; + regulator-max-microvolt = <3300000>; + }; + + ldo2_reg: LDO2 { + regulator-name = "VDD_ALIVE_1.1V"; + regulator-min-microvolt = <1100000>; + regulator-max-microvolt = <1100000>; + regulator-always-on; + }; + + buck1_reg: BUCK1 { + regulator-name = "VDD_ARM_1.2V"; + regulator-min-microvolt = <950000>; + regulator-max-microvolt = <1350000>; + regulator-always-on; + regulator-boot-on; + }; + }; + }; diff --git a/drivers/mfd/max8997.c b/drivers/mfd/max8997.c index f1235170..abd5c80 100644 --- a/drivers/mfd/max8997.c +++ b/drivers/mfd/max8997.c @@ -21,8 +21,10 @@ * This driver is based on max8998.c */ +#include #include #include +#include #include #include #include @@ -47,6 +49,13 @@ static struct mfd_cell max8997_devs[] = { { .name = "max8997-led", .id = 2 }, }; +#ifdef CONFIG_OF +static struct of_device_id __devinitdata max8997_pmic_dt_match[] = { + { .compatible = "maxim,max8997-pmic", .data = TYPE_MAX8997 }, + {}, +}; +#endif + int max8997_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest) { struct max8997_dev *max8997 = i2c_get_clientdata(i2c); @@ -123,6 +132,58 @@ int max8997_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask) } EXPORT_SYMBOL_GPL(max8997_update_reg); +#ifdef CONFIG_OF +/* + * Only the common platform data elements for max8997 are parsed here from the + * device tree. Other sub-modules of max8997 such as pmic, rtc and others have + * to parse their own platform data elements from device tree. + * + * The max8997 platform data structure is instantiated here and the drivers for + * the sub-modules need not instantiate another instance while parsing their + * platform data. + */ +static struct max8997_platform_data *max8997_i2c_parse_dt_pdata( + struct device *dev) +{ + struct max8997_platform_data *pd; + + pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); + if (!pd) { + dev_err(dev, "could not allocate memory for pdata\n"); + return ERR_PTR(-ENOMEM); + } + + pd->ono = irq_of_parse_and_map(dev->of_node, 1); + + /* + * ToDo: the 'wakeup' member in the platform data is more of a linux + * specfic information. Hence, there is no binding for that yet and + * not parsed here. + */ + + return pd; +} +#else +static struct max8997_platform_data *max8997_i2c_parse_dt_pdata( + struct device *dev) +{ + return 0; +} +#endif + +static inline int max8997_i2c_get_driver_data(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ +#ifdef CONFIG_OF + if (i2c->dev.of_node) { + const struct of_device_id *match; + match = of_match_node(max8997_pmic_dt_match, i2c->dev.of_node); + return (int)match->data; + } +#endif + return (int)id->driver_data; +} + static int max8997_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { @@ -137,12 +198,21 @@ static int max8997_i2c_probe(struct i2c_client *i2c, i2c_set_clientdata(i2c, max8997); max8997->dev = &i2c->dev; max8997->i2c = i2c; - max8997->type = id->driver_data; + max8997->type = max8997_i2c_get_driver_data(i2c, id); max8997->irq = i2c->irq; + if (max8997->dev->of_node) { + pdata = max8997_i2c_parse_dt_pdata(max8997->dev); + if (IS_ERR(pdata)) { + ret = PTR_ERR(pdata); + goto err; + } + } + if (!pdata) goto err; + max8997->pdata = pdata; max8997->ono = pdata->ono; mutex_init(&max8997->iolock); @@ -434,6 +504,7 @@ static struct i2c_driver max8997_i2c_driver = { .name = "max8997", .owner = THIS_MODULE, .pm = &max8997_pm, + .of_match_table = of_match_ptr(max8997_pmic_dt_match), }, .probe = max8997_i2c_probe, .remove = max8997_i2c_remove, diff --git a/drivers/regulator/max8997.c b/drivers/regulator/max8997.c index 64cf2ee..b56c432 100644 --- a/drivers/regulator/max8997.c +++ b/drivers/regulator/max8997.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include #include @@ -31,6 +32,7 @@ #include #include #include +#include struct max8997_data { struct device *dev; @@ -933,10 +935,145 @@ static struct regulator_desc regulators[] = { max8997_charger_fixedstate_ops), }; +#ifdef CONFIG_OF +static int max8997_pmic_dt_parse_dvs_gpio(struct max8997_dev *iodev, + struct max8997_platform_data *pdata, + struct device_node *pmic_np) +{ + int i, gpio; + + for (i = 0; i < 3; i++) { + gpio = of_get_named_gpio(pmic_np, + "max8997,pmic-buck125-dvs-gpios", i); + if (!gpio_is_valid(gpio)) { + dev_err(iodev->dev, "invalid gpio[%d]: %d\n", i, gpio); + return -EINVAL; + } + pdata->buck125_gpios[i] = gpio; + } + return 0; +} + +static int max8997_pmic_dt_parse_pdata(struct max8997_dev *iodev, + struct max8997_platform_data *pdata) +{ + struct device_node *pmic_np, *regulators_np, *reg_np; + struct max8997_regulator_data *rdata; + unsigned int i, dvs_voltage_nr = 1, ret; + + pmic_np = iodev->dev->of_node; + if (!pmic_np) { + dev_err(iodev->dev, "could not find pmic sub-node\n"); + return -ENODEV; + } + + regulators_np = of_find_node_by_name(pmic_np, "regulators"); + if (!regulators_np) { + dev_err(iodev->dev, "could not find regulators sub-node\n"); + return -EINVAL; + } + + /* count the number of regulators to be supported in pmic */ + pdata->num_regulators = 0; + for_each_child_of_node(regulators_np, reg_np) + pdata->num_regulators++; + + rdata = devm_kzalloc(iodev->dev, sizeof(*rdata) * + pdata->num_regulators, GFP_KERNEL); + if (!rdata) { + dev_err(iodev->dev, "could not allocate memory for " + "regulator data\n"); + return -ENOMEM; + } + + pdata->regulators = rdata; + for_each_child_of_node(regulators_np, reg_np) { + for (i = 0; i < ARRAY_SIZE(regulators); i++) + if (!of_node_cmp(reg_np->name, regulators[i].name)) + break; + + if (i == ARRAY_SIZE(regulators)) { + dev_warn(iodev->dev, "don't know how to configure " + "regulator %s\n", reg_np->name); + continue; + } + + rdata->id = i; + rdata->initdata = of_get_regulator_init_data( + iodev->dev, reg_np); + rdata->reg_node = reg_np; + rdata++; + } + + if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL)) + pdata->buck1_gpiodvs = true; + + if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL)) + pdata->buck2_gpiodvs = true; + + if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL)) + pdata->buck5_gpiodvs = true; + + if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs || + pdata->buck5_gpiodvs) { + ret = max8997_pmic_dt_parse_dvs_gpio(iodev, pdata, pmic_np); + if (ret) + return -EINVAL; + + if (of_property_read_u32(pmic_np, + "max8997,pmic-buck125-default-dvs-idx", + &pdata->buck125_default_idx)) { + pdata->buck125_default_idx = 0; + } else { + if (pdata->buck125_default_idx >= 8) { + pdata->buck125_default_idx = 0; + dev_info(iodev->dev, "invalid value for " + "default dvs index, using 0 instead\n"); + } + } + + if (of_get_property(pmic_np, + "max8997,pmic-ignore-gpiodvs-side-effect", NULL)) + pdata->ignore_gpiodvs_side_effect = true; + + dvs_voltage_nr = 8; + } + + if (of_property_read_u32_array(pmic_np, + "max8997,pmic-buck1-dvs-voltage", + pdata->buck1_voltage, dvs_voltage_nr)) { + dev_err(iodev->dev, "buck1 voltages not specified\n"); + return -EINVAL; + } + + if (of_property_read_u32_array(pmic_np, + "max8997,pmic-buck2-dvs-voltage", + pdata->buck2_voltage, dvs_voltage_nr)) { + dev_err(iodev->dev, "buck2 voltages not specified\n"); + return -EINVAL; + } + + if (of_property_read_u32_array(pmic_np, + "max8997,pmic-buck5-dvs-voltage", + pdata->buck5_voltage, dvs_voltage_nr)) { + dev_err(iodev->dev, "buck5 voltages not specified\n"); + return -EINVAL; + } + + return 0; +} +#else +static int max8997_pmic_dt_parse_pdata(struct max8997_dev *iodev, + struct max8997_platform_data *pdata) +{ + return 0; +} +#endif /* CONFIG_OF */ + static __devinit int max8997_pmic_probe(struct platform_device *pdev) { struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent); - struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev); + struct max8997_platform_data *pdata = iodev->pdata; struct regulator_config config = { }; struct regulator_dev **rdev; struct max8997_data *max8997; @@ -944,11 +1081,17 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev) int i, ret, size, nr_dvs; u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0; - if (!pdata) { + if (IS_ERR_OR_NULL(pdata)) { dev_err(pdev->dev.parent, "No platform init data supplied.\n"); return -ENODEV; } + if (iodev->dev->of_node) { + ret = max8997_pmic_dt_parse_pdata(iodev, pdata); + if (ret) + return ret; + } + max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data), GFP_KERNEL); if (!max8997) @@ -1104,6 +1247,7 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev) config.dev = max8997->dev; config.init_data = pdata->regulators[i].initdata; config.driver_data = max8997; + config.of_node = pdata->regulators[i].reg_node; rdev[i] = regulator_register(®ulators[id], &config); if (IS_ERR(rdev[i])) { diff --git a/include/linux/mfd/max8997-private.h b/include/linux/mfd/max8997-private.h index 830152c..6ae21bf 100644 --- a/include/linux/mfd/max8997-private.h +++ b/include/linux/mfd/max8997-private.h @@ -316,6 +316,7 @@ enum max8997_irq { #define MAX8997_NUM_GPIO 12 struct max8997_dev { struct device *dev; + struct max8997_platform_data *pdata; struct i2c_client *i2c; /* 0xcc / PMIC, Battery Control, and FLASH */ struct i2c_client *rtc; /* slave addr 0x0c */ struct i2c_client *haptic; /* slave addr 0x90 */ diff --git a/include/linux/mfd/max8997.h b/include/linux/mfd/max8997.h index 328d8e2..1d4a4fe 100644 --- a/include/linux/mfd/max8997.h +++ b/include/linux/mfd/max8997.h @@ -75,6 +75,7 @@ enum max8998_regulators { struct max8997_regulator_data { int id; struct regulator_init_data *initdata; + struct device_node *reg_node; }; enum max8997_muic_usb_type { -- cgit v1.1