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4dc27f9644
The driver provides regulator set/get voltage and enable/disable functions for CPCAP PMIC. Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2025 Svyatoslav Ryhel <clamor95@gmail.com>
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*/
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#include <dm.h>
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#include <dm/lists.h>
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#include <log.h>
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#include <power/pmic.h>
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#include <power/cpcap.h>
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#include <spi.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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static const struct pmic_child_info pmic_children_info[] = {
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{ .prefix = "sw", .driver = CPCAP_SW_DRIVER },
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{ .prefix = "v", .driver = CPCAP_LDO_DRIVER },
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{ },
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};
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static int cpcap_write(struct udevice *dev, uint reg, const uint8_t *buff, int len)
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{
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u8 buf[4];
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u16 data = *(u16 *)buff;
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int ret;
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buf[0] = ((reg >> 8) & 0xff) | 0x80;
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buf[1] = reg & 0xff;
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buf[2] = data >> 8 & 0xff;
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buf[3] = data & 0xff;
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ret = dm_spi_xfer(dev, 32, buf, NULL, SPI_XFER_ONCE);
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log_debug("%s: reg 0x%x, data 0x%04x, ret %d\n", __func__, reg, data, ret);
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return ret;
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}
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static int cpcap_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
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{
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u8 buf[4];
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int ret;
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buf[0] = (reg >> 8) & 0xff;
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buf[1] = reg & 0xff;
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buf[2] = 0;
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buf[3] = 0;
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ret = dm_spi_xfer(dev, 32, buf, buf, SPI_XFER_ONCE);
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*buff = (buf[2] << 8) | buf[3];
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log_debug("%s: reg 0x%x, data 0x%04x, ret %d\n", __func__, reg, *buff, ret);
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return ret;
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}
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static int cpcap_bind(struct udevice *dev)
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{
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ofnode regulators_node;
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int children;
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/* Regulator device node of PMIC */
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regulators_node = dev_read_subnode(dev, "regulator");
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if (!ofnode_valid(regulators_node)) {
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log_err("%s regulator subnode not found!\n", dev->name);
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return -ENXIO;
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}
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/* Actual regulators container */
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regulators_node = ofnode_find_subnode(regulators_node, "regulators");
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if (!ofnode_valid(regulators_node)) {
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log_err("%s regulators subnode not found!\n", dev->name);
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return -ENXIO;
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}
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debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
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children = pmic_bind_children(dev, regulators_node, pmic_children_info);
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if (!children)
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log_err("%s - no child found\n", dev->name);
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return dm_scan_fdt_dev(dev);
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}
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static int cpcap_probe(struct udevice *dev)
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{
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struct spi_slave *slave = dev_get_parent_priv(dev);
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int ret;
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ret = spi_claim_bus(slave);
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if (ret) {
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log_err("SPI bus allocation failed (%d)\n", ret);
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return ret;
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}
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u16 id = pmic_reg_read(dev, CPCAP_REG_VERSC1);
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u16 ven = (id >> 6) & 0x7;
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u16 rev = ((id >> 3) & 0x7) | ((id << 3) & 0x38);
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log_debug("%s: vendor %s rev: %i.%i (%x)\n", __func__,
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ven == CPCAP_VENDOR_ST ? "ST" : "TI",
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CPCAP_REVISION_MAJOR(rev), CPCAP_REVISION_MINOR(rev),
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rev);
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return 0;
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}
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static struct dm_pmic_ops cpcap_ops = {
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.read = cpcap_read,
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.write = cpcap_write,
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};
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static const struct udevice_id cpcap_ids[] = {
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{ .compatible = "motorola,cpcap" },
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{ .compatible = "st,6556002" },
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{ }
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};
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U_BOOT_DRIVER(pmic_cpcap) = {
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.name = "cpcap_pmic",
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.id = UCLASS_PMIC,
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.of_match = cpcap_ids,
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.bind = cpcap_bind,
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.probe = cpcap_probe,
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.ops = &cpcap_ops,
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};
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