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https://github.com/brain-hackers/u-boot-brain
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d77af8a8c9
The RK818 chip is a Power Management IC (PMIC) for multimedia and handheld devices. For boards use rk818, the input current should be set in the early stage, before ddr initialization. Signed-off-by: Jacob Chen <jacob-chen@iotwrt.com>
119 lines
2.4 KiB
C
119 lines
2.4 KiB
C
/*
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* Copyright (C) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <fdtdec.h>
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#include <libfdt.h>
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#include <power/rk808_pmic.h>
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#include <power/pmic.h>
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DECLARE_GLOBAL_DATA_PTR;
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static const struct pmic_child_info pmic_children_info[] = {
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{ .prefix = "DCDC_REG", .driver = "rk808_buck"},
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{ .prefix = "LDO_REG", .driver = "rk808_ldo"},
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{ .prefix = "SWITCH_REG", .driver = "rk808_switch"},
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{ },
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};
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static int rk808_reg_count(struct udevice *dev)
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{
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return RK808_NUM_OF_REGS;
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}
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static int rk808_write(struct udevice *dev, uint reg, const uint8_t *buff,
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int len)
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{
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int ret;
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ret = dm_i2c_write(dev, reg, buff, len);
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if (ret) {
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debug("write error to device: %p register: %#x!", dev, reg);
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return ret;
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}
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return 0;
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}
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static int rk808_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
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{
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int ret;
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ret = dm_i2c_read(dev, reg, buff, len);
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if (ret) {
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debug("read error from device: %p register: %#x!", dev, reg);
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return ret;
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}
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return 0;
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}
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#if CONFIG_IS_ENABLED(PMIC_CHILDREN)
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static int rk808_bind(struct udevice *dev)
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{
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const void *blob = gd->fdt_blob;
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int regulators_node;
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int children;
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regulators_node = fdt_subnode_offset(blob, dev_of_offset(dev),
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"regulators");
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if (regulators_node <= 0) {
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debug("%s: %s regulators subnode not found!", __func__,
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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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debug("%s: %s - no child found\n", __func__, dev->name);
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/* Always return success for this device */
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return 0;
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}
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#endif
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static int rk808_probe(struct udevice *dev)
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{
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struct rk808_priv *priv = dev_get_priv(dev);
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uint8_t msb, lsb;
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/* read Chip variant */
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rk808_read(dev, ID_MSB, &msb, 1);
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rk808_read(dev, ID_LSB, &lsb, 1);
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priv->variant = ((msb << 8) | lsb) & RK8XX_ID_MSK;
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return 0;
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}
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static struct dm_pmic_ops rk808_ops = {
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.reg_count = rk808_reg_count,
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.read = rk808_read,
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.write = rk808_write,
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};
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static const struct udevice_id rk808_ids[] = {
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{ .compatible = "rockchip,rk808" },
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{ .compatible = "rockchip,rk818" },
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{ }
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};
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U_BOOT_DRIVER(pmic_rk808) = {
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.name = "rk808 pmic",
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.id = UCLASS_PMIC,
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.of_match = rk808_ids,
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#if CONFIG_IS_ENABLED(PMIC_CHILDREN)
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.bind = rk808_bind,
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#endif
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.probe = rk808_probe,
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.ops = &rk808_ops,
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};
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