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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2025 Svyatoslav Ryhel <clamor95@gmail.com>
*/
#include <dm.h>
#include <dm/lists.h>
#include <log.h>
#include <power/pmic.h>
#include <power/cpcap.h>
#include <spi.h>
#include <linux/delay.h>
#include <linux/err.h>
static const struct pmic_child_info pmic_children_info[] = {
{ .prefix = "sw", .driver = CPCAP_SW_DRIVER },
{ .prefix = "v", .driver = CPCAP_LDO_DRIVER },
{ },
};
static int cpcap_write(struct udevice *dev, uint reg, const uint8_t *buff, int len)
{
u8 buf[4];
u16 data = *(u16 *)buff;
int ret;
buf[0] = ((reg >> 8) & 0xff) | 0x80;
buf[1] = reg & 0xff;
buf[2] = data >> 8 & 0xff;
buf[3] = data & 0xff;
ret = dm_spi_xfer(dev, 32, buf, NULL, SPI_XFER_ONCE);
log_debug("%s: reg 0x%x, data 0x%04x, ret %d\n", __func__, reg, data, ret);
return ret;
}
static int cpcap_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
{
u8 buf[4];
int ret;
buf[0] = (reg >> 8) & 0xff;
buf[1] = reg & 0xff;
buf[2] = 0;
buf[3] = 0;
ret = dm_spi_xfer(dev, 32, buf, buf, SPI_XFER_ONCE);
*buff = (buf[2] << 8) | buf[3];
log_debug("%s: reg 0x%x, data 0x%04x, ret %d\n", __func__, reg, *buff, ret);
return ret;
}
static int cpcap_bind(struct udevice *dev)
{
ofnode regulators_node;
int children;
/* Regulator device node of PMIC */
regulators_node = dev_read_subnode(dev, "regulator");
if (!ofnode_valid(regulators_node)) {
log_err("%s regulator subnode not found!\n", dev->name);
return -ENXIO;
}
/* Actual regulators container */
regulators_node = ofnode_find_subnode(regulators_node, "regulators");
if (!ofnode_valid(regulators_node)) {
log_err("%s regulators subnode not found!\n", dev->name);
return -ENXIO;
}
debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
children = pmic_bind_children(dev, regulators_node, pmic_children_info);
if (!children)
log_err("%s - no child found\n", dev->name);
return dm_scan_fdt_dev(dev);
}
static int cpcap_probe(struct udevice *dev)
{
struct spi_slave *slave = dev_get_parent_priv(dev);
int ret;
ret = spi_claim_bus(slave);
if (ret) {
log_err("SPI bus allocation failed (%d)\n", ret);
return ret;
}
u16 id = pmic_reg_read(dev, CPCAP_REG_VERSC1);
u16 ven = (id >> 6) & 0x7;
u16 rev = ((id >> 3) & 0x7) | ((id << 3) & 0x38);
log_debug("%s: vendor %s rev: %i.%i (%x)\n", __func__,
ven == CPCAP_VENDOR_ST ? "ST" : "TI",
CPCAP_REVISION_MAJOR(rev), CPCAP_REVISION_MINOR(rev),
rev);
return 0;
}
static struct dm_pmic_ops cpcap_ops = {
.read = cpcap_read,
.write = cpcap_write,
};
static const struct udevice_id cpcap_ids[] = {
{ .compatible = "motorola,cpcap" },
{ .compatible = "st,6556002" },
{ }
};
U_BOOT_DRIVER(pmic_cpcap) = {
.name = "cpcap_pmic",
.id = UCLASS_PMIC,
.of_match = cpcap_ids,
.bind = cpcap_bind,
.probe = cpcap_probe,
.ops = &cpcap_ops,
};
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