// SPDX-License-Identifier: GPL-2.0+ /* * (C) 2018 Theobroma Systems Design und Consulting GmbH */ #include #include #include #include #include #include #include #include #include #include #include #include /** * struct ic_types - definition of fan53555-family devices * * @die_id: Identifies the DIE_ID (lower nibble of the ID1 register) * @die_rev: Identifies the DIE_REV (lower nibble of the ID2 register) * @vsel_min: starting voltage (step 0) in uV * @vsel_step: increment of the voltage in uV * * The voltage ramp (i.e. minimum voltage and step) is selected from the * combination of 2 nibbles: DIE_ID and DIE_REV. * * See http://www.onsemi.com/pub/Collateral/FAN53555-D.pdf for details. */ static const struct { unsigned int vendor; u8 die_id; u8 die_rev; bool check_rev; u32 vsel_min; u32 vsel_step; } ic_types[] = { /* Option 00 */ { FAN53555_VENDOR_FAIRCHILD, 0x0, 0x3, true, 600000, 10000 }, /* Option 13 */ { FAN53555_VENDOR_FAIRCHILD, 0x0, 0xf, true, 800000, 10000 }, /* Option 23 */ { FAN53555_VENDOR_FAIRCHILD, 0x0, 0xc, true, 600000, 12500 }, /* Option 01 */ { FAN53555_VENDOR_FAIRCHILD, 0x1, 0x3, true, 600000, 10000 }, /* Option 03 */ { FAN53555_VENDOR_FAIRCHILD, 0x3, 0x3, true, 600000, 10000 }, /* Option 04 */ { FAN53555_VENDOR_FAIRCHILD, 0x4, 0xf, true, 603000, 12826 }, /* Option 05 */ { FAN53555_VENDOR_FAIRCHILD, 0x5, 0x3, true, 600000, 10000 }, /* Option 08 */ { FAN53555_VENDOR_FAIRCHILD, 0x8, 0x1, true, 600000, 10000 }, /* Option 08 */ { FAN53555_VENDOR_FAIRCHILD, 0x8, 0xf, true, 600000, 10000 }, /* Option 09 */ { FAN53555_VENDOR_FAIRCHILD, 0xc, 0xf, true, 603000, 12826 }, /* SYL82X */ { FAN53555_VENDOR_SILERGY, 0x8, 0x0, false, 712500, 12500 }, /* SYL83X */ { FAN53555_VENDOR_SILERGY, 0x9, 0x0, false, 712500, 12500 }, }; /* I2C-accessible byte-sized registers */ enum { /* Voltage setting */ FAN53555_VSEL0 = 0x00, FAN53555_VSEL1, /* Control register */ FAN53555_CONTROL, /* IC Type */ FAN53555_ID1, /* IC mask version */ FAN53555_ID2, /* Monitor register */ FAN53555_MONITOR, }; struct fan53555_platdata { /* Voltage setting register */ unsigned int vol_reg; unsigned int sleep_reg; }; struct fan53555_priv { /* IC Vendor */ unsigned int vendor; /* IC Type and Rev */ unsigned int die_id; unsigned int die_rev; /* Voltage range and step(linear) */ unsigned int vsel_min; unsigned int vsel_step; /* Voltage slew rate limiting */ unsigned int slew_rate; /* Sleep voltage cache */ unsigned int sleep_vol_cache; }; static int fan53555_regulator_ofdata_to_platdata(struct udevice *dev) { struct fan53555_platdata *dev_pdata = dev_get_platdata(dev); struct dm_regulator_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev); u32 sleep_vsel; /* This is a buck regulator */ uc_pdata->type = REGULATOR_TYPE_BUCK; sleep_vsel = dev_read_u32_default(dev, "fcs,suspend-voltage-selector", FAN53555_VSEL1); /* * Depending on the device-tree settings, the 'normal mode' * voltage is either controlled by VSEL0 or VSEL1. */ switch (sleep_vsel) { case FAN53555_VSEL0: dev_pdata->sleep_reg = FAN53555_VSEL0; dev_pdata->vol_reg = FAN53555_VSEL1; break; case FAN53555_VSEL1: dev_pdata->sleep_reg = FAN53555_VSEL1; dev_pdata->vol_reg = FAN53555_VSEL0; break; default: pr_err("%s: invalid vsel id %d\n", dev->name, sleep_vsel); return -EINVAL; } return 0; } static int fan53555_regulator_get_value(struct udevice *dev) { struct fan53555_platdata *pdata = dev_get_platdata(dev); struct fan53555_priv *priv = dev_get_priv(dev); int reg; int voltage; /* We only support a single voltage selector (i.e. 'normal' mode). */ reg = pmic_reg_read(dev->parent, pdata->vol_reg); if (reg < 0) return reg; voltage = priv->vsel_min + (reg & 0x3f) * priv->vsel_step; debug("%s: %d uV\n", __func__, voltage); return voltage; } static int fan53555_regulator_set_value(struct udevice *dev, int uV) { struct fan53555_platdata *pdata = dev_get_platdata(dev); struct fan53555_priv *priv = dev_get_priv(dev); u8 vol; vol = (uV - priv->vsel_min) / priv->vsel_step; debug("%s: uV=%d; writing volume %d: %02x\n", __func__, uV, pdata->vol_reg, vol); return pmic_clrsetbits(dev->parent, pdata->vol_reg, GENMASK(6, 0), vol); } static int fan53555_voltages_setup(struct udevice *dev) { struct fan53555_priv *priv = dev_get_priv(dev); int i; /* Init voltage range and step */ for (i = 0; i < ARRAY_SIZE(ic_types); ++i) { if (ic_types[i].vendor != priv->vendor) continue; if (ic_types[i].die_id != priv->die_id) continue; if (ic_types[i].check_rev && ic_types[i].die_rev != priv->die_rev) continue; priv->vsel_min = ic_types[i].vsel_min; priv->vsel_step = ic_types[i].vsel_step; return 0; } pr_err("%s: %s: die id %d rev %d not supported!\n", dev->name, __func__, priv->die_id, priv->die_rev); return -EINVAL; } enum { DIE_ID_SHIFT = 0, DIE_ID_WIDTH = 4, DIE_REV_SHIFT = 0, DIE_REV_WIDTH = 4, }; static int fan53555_probe(struct udevice *dev) { struct fan53555_priv *priv = dev_get_priv(dev); int ID1, ID2; debug("%s\n", __func__); /* read chip ID1 and ID2 (two registers, starting at ID1) */ ID1 = pmic_reg_read(dev->parent, FAN53555_ID1); if (ID1 < 0) return ID1; ID2 = pmic_reg_read(dev->parent, FAN53555_ID2); if (ID2 < 0) return ID2; /* extract vendor, die_id and die_rev */ priv->vendor = dev->driver_data; priv->die_id = ID1 & GENMASK(3, 0); priv->die_rev = ID2 & GENMASK(3, 0); if (fan53555_voltages_setup(dev) < 0) return -ENODATA; debug("%s: FAN53555 option %d rev %d detected\n", __func__, priv->die_id, priv->die_rev); return 0; } static const struct dm_regulator_ops fan53555_regulator_ops = { .get_value = fan53555_regulator_get_value, .set_value = fan53555_regulator_set_value, }; U_BOOT_DRIVER(fan53555_regulator) = { .name = "fan53555_regulator", .id = UCLASS_REGULATOR, .ops = &fan53555_regulator_ops, .ofdata_to_platdata = fan53555_regulator_ofdata_to_platdata, .platdata_auto = sizeof(struct fan53555_platdata), .priv_auto = sizeof(struct fan53555_priv), .probe = fan53555_probe, };