power: pmic: add the basic CPCAP PMIC support
The CPCAP is a Motorola/ST-Ericsson creation, a multifunctional IC whose
main purpose was power control. It was used in a wide variety of Motorola
products, both Tegra and OMAP based. The most notable devices using this
PMIC are the Motorola Droid 4, Atrix 4G, and Droid X2.
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
diff --git a/drivers/power/pmic/cpcap.c b/drivers/power/pmic/cpcap.c
new file mode 100644
index 0000000..4923255
--- /dev/null
+++ b/drivers/power/pmic/cpcap.c
@@ -0,0 +1,90 @@
+// 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 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_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,
+ .probe = cpcap_probe,
+ .ops = &cpcap_ops,
+};