--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) 2018 Theobroma Systems Design und Consulting GmbH
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+
+static int pmic_fan53555_reg_count(struct udevice *dev)
+{
+ return 1;
+};
+
+static int pmic_fan53555_read(struct udevice *dev, uint reg,
+ u8 *buff, int len)
+{
+ if (dm_i2c_read(dev, reg, buff, len)) {
+ pr_err("%s: read error for register: %#x!", dev->name, reg);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int pmic_fan53555_write(struct udevice *dev, uint reg,
+ const u8 *buff, int len)
+{
+ if (dm_i2c_write(dev, reg, buff, len)) {
+ pr_err("%s: write error for register: %#x!", dev->name, reg);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int pmic_fan53555_bind(struct udevice *dev)
+{
+ /*
+ * The FAN53555 has only a single regulator and therefore doesn't
+ * have a subnode. So we have to rebind a child device (the one
+ * regulator) here.
+ */
+
+ const char *regulator_driver_name = "fan53555_regulator";
+ struct udevice *child;
+ struct driver *drv;
+
+ debug("%s\n", __func__);
+
+ drv = lists_driver_lookup_name(regulator_driver_name);
+ if (!drv) {
+ dev_err(dev, "no driver '%s'\n", regulator_driver_name);
+ return -ENOENT;
+ }
+
+ return device_bind_with_driver_data(dev, drv, "SW", 0,
+ dev_ofnode(dev), &child);
+};
+
+static struct dm_pmic_ops pmic_fan53555_ops = {
+ .reg_count = pmic_fan53555_reg_count,
+ .read = pmic_fan53555_read,
+ .write = pmic_fan53555_write,
+};
+
+static const struct udevice_id pmic_fan53555_match[] = {
+ { .compatible = "fcs,fan53555" },
+ { },
+};
+
+U_BOOT_DRIVER(pmic_fan53555) = {
+ .name = "pmic_fan53555",
+ .id = UCLASS_PMIC,
+ .of_match = pmic_fan53555_match,
+ .bind = pmic_fan53555_bind,
+ .ops = &pmic_fan53555_ops,
+};
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) 2018 Theobroma Systems Design und Consulting GmbH
+ */
+
+#include <common.h>
+#include <bitfield.h>
+#include <errno.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <i2c.h>
+#include <asm/gpio.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+
+/**
+ * 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 {
+ u8 die_id;
+ u8 die_rev;
+ u32 vsel_min;
+ u32 vsel_step;
+} ic_types[] = {
+ { 0x0, 0x3, 600000, 10000 }, /* Option 00 */
+ { 0x0, 0xf, 800000, 10000 }, /* Option 13 */
+ { 0x0, 0xc, 600000, 12500 }, /* Option 23 */
+ { 0x1, 0x3, 600000, 10000 }, /* Option 01 */
+ { 0x3, 0x3, 600000, 10000 }, /* Option 03 */
+ { 0x4, 0xf, 603000, 12826 }, /* Option 04 */
+ { 0x5, 0x3, 600000, 10000 }, /* Option 05 */
+ { 0x8, 0x1, 600000, 10000 }, /* Option 08 */
+ { 0x8, 0xf, 600000, 10000 }, /* Option 08 */
+ { 0xc, 0xf, 603000, 12826 }, /* Option 09 */
+};
+
+/* 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, 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].die_id != priv->die_id)
+ continue;
+
+ if (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 = bitfield_extract(ID1, 5, 3);
+ 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_alloc_size = sizeof(struct fan53555_platdata),
+ .priv_auto_alloc_size = sizeof(struct fan53555_priv),
+ .probe = fan53555_probe,
+};
projects / u-boot.git / commitdiff
