power: Add base support for the RK808 PMIC
This Rockchip PMIC provides features suitable for battery-powered
applications. It is commonly used with Rockchip SoCs.
Add a driver which provides register access. The regulator driver will use
this.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/power/pmic/rk808.c b/drivers/power/pmic/rk808.c
new file mode 100644
index 0000000..11d5f07
--- /dev/null
+++ b/drivers/power/pmic/rk808.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <libfdt.h>
+#include <power/rk808_pmic.h>
+#include <power/pmic.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const struct pmic_child_info pmic_children_info[] = {
+ { .prefix = "DCDC_REG", .driver = "rk808_buck"},
+ { .prefix = "LDO_REG", .driver = "rk808_ldo"},
+ { .prefix = "SWITCH_REG", .driver = "rk808_switch"},
+ { },
+};
+
+static int rk808_reg_count(struct udevice *dev)
+{
+ return RK808_NUM_OF_REGS;
+}
+
+static int rk808_write(struct udevice *dev, uint reg, const uint8_t *buff,
+ int len)
+{
+ if (dm_i2c_write(dev, reg, buff, len)) {
+ debug("write error to device: %p register: %#x!", dev, reg);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int rk808_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
+{
+ if (dm_i2c_read(dev, reg, buff, len)) {
+ debug("read error from device: %p register: %#x!", dev, reg);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+#if CONFIG_IS_ENABLED(PMIC_CHILDREN)
+static int rk808_bind(struct udevice *dev)
+{
+ const void *blob = gd->fdt_blob;
+ int regulators_node;
+ int children;
+
+ regulators_node = fdt_subnode_offset(blob, dev->of_offset,
+ "regulators");
+ if (regulators_node <= 0) {
+ debug("%s: %s regulators subnode not found!", __func__,
+ 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)
+ debug("%s: %s - no child found\n", __func__, dev->name);
+
+ /* Always return success for this device */
+ return 0;
+}
+#endif
+
+static struct dm_pmic_ops rk808_ops = {
+ .reg_count = rk808_reg_count,
+ .read = rk808_read,
+ .write = rk808_write,
+};
+
+static const struct udevice_id rk808_ids[] = {
+ { .compatible = "rockchip,rk808" },
+ { }
+};
+
+U_BOOT_DRIVER(pmic_rk808) = {
+ .name = "rk808 pmic",
+ .id = UCLASS_PMIC,
+ .of_match = rk808_ids,
+#if CONFIG_IS_ENABLED(PMIC_CHILDREN)
+ .bind = rk808_bind,
+#endif
+ .ops = &rk808_ops,
+};